{ "data": { "a": { "slug": "kroki", "name": "Kroki", "vendor": "Yuzu tech", "vendorUrl": "https://kroki.io", "kind": "http-api", "category": "diagramming", "summary": "Kroki is an open-source HTTP server from Yuzu tech that converts diagram text in 29 formats, including PlantUML, Mermaid, GraphViz and D2, into SVG, PNG or PDF. Owners run it from Docker images, and kroki.io is a free public instance.", "url": "https://www.anchorterminal.com/tools/kroki", "markdownUrl": "https://www.anchorterminal.com/tools/kroki.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/kroki.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/kroki.json", "repo": "https://github.com/yuzutech/kroki", "license": "MIT", "transports": [ "http" ], "packages": [ { "registry": "oci", "name": "yuzutech/kroki" }, { "registry": "oci", "name": "yuzutech/kroki-mermaid" }, { "registry": "oci", "name": "yuzutech/kroki-bpmn" }, { "registry": "oci", "name": "yuzutech/kroki-excalidraw" } ], "auth": "none", "authNotes": "No account, key or login on the convert endpoints, on a self-hosted server or on the public instance at kroki.io. The server binds all interfaces on port 8000 unless `KROKI_LISTEN` says otherwise. An optional bearer token, `KROKI_COMPANION_REGISTRATION_TOKEN`, protects only the `/services` registration API, which is off by default.", "pricing": "free", "pricingNotes": "Free under the MIT licence, with nothing to buy. The public instance at kroki.io is free and paid for by sponsors, for reasonable, non-commercial use with no uptime guarantee. Third parties sell hosting, which the project says it does not operate.", "priceSummary": "Free · OSS", "where": "local", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the docs or the source (checked 2026-10-09).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 4365, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-09" }, "docsUrl": "https://docs.kroki.io/kroki/setup/usage/", "capabilities": [ "diagram.as-code", "diagram.create", "diagram.export", "diagram.architecture" ], "tags": [ "open-source", "self-hosted", "http-api", "docker", "diagram-as-code", "plantuml", "mermaid", "graphviz", "no-auth", "free" ], "lastRelease": "2026-10-05", "graded": true, "anchor": { "graded": true, "score": 59.2, "grade": "C", "agentReady": false, "rank": 558, "ranked": true, "rankOf": 950, "categoryRank": 8, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 70, "maintenance": 86, "payments": 60, "reliability": 74, "schema": 48, "security": 56, "transparency": 62 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-09" }, "negative": -5, "negativeNotes": [ "27 July to 12 August 2026. Four advisories on the repository. GHSA-wmpp-fj9c-w766 (critical, CVSS 9.8) allowed unauthenticated remote code execution on `/tikz/svg` in 0.21.0 up to 0.32.0 whatever the safe mode. GHSA-r54f-fq6c-53vw (high, CVE-2026-102359), GHSA-px99-rjv4-49g8 (medium, CVE-2026-102356) and GHSA-9p7m-vrmg-qp4q (high) let TikZ, Mermaid and Vega diagrams read local files or fetch URLs in `SECURE` mode. All are fixed, in 0.32.1 at the latest, and the maintainers published each with a changelog entry, so the deduction is five points (https://github.com/yuzutech/kroki/security/advisories)." ], "verdict": "One unauthenticated POST with diagram text returns an image for 29 diagram types, and five versions shipped between 15 July and 5 October 2026. Four advisories were published in July and August 2026, one an unauthenticated remote code execution on `/tikz/svg`, all fixed. No OpenAPI file exists, and the public instance has no terms, privacy policy or status page.", "bestFor": "Agents that write diagrams in several text formats and want one render endpoint, on a private network or through the public instance for non-sensitive diagrams.", "strengths": [ "`POST /` with `diagram_source`, `diagram_type` and `output_format`, or plain text to `/\u003ctype\u003e/\u003cformat\u003e`, returns the image. No account or key", "One API covers 29 diagram types, among them PlantUML, C4, Structurizr, Mermaid, GraphViz, D2, DBML, BPMN, Excalidraw and Vega", "`KROKI_SAFE_MODE` defaults to `SECURE`, which blocks file and network reads by diagram libraries, and the container runs as the non-root user `kroki`", "Five versions shipped between 15 July and 5 October 2026, and the `main.yaml` workflow passed on the last ten pushes to `main`", "MIT licence. The maintainers published four security advisories in 2026, each with a fixed version and a changelog entry" ], "weaknesses": [ "GHSA-wmpp-fj9c-w766 (CVSS 9.8) allowed unauthenticated remote code execution on `/tikz/svg` in versions 0.21.0 up to 0.32.0, whatever the safe mode. Fixed 3 August 2026", "Three more advisories in July and August 2026 let TikZ, Mermaid and Vega diagrams read local files or fetch URLs in `SECURE` mode. All are fixed in 0.32.1", "No OpenAPI file, llms.txt or error catalogue. The JSON error shape is in the source and not in the documentation", "The public instance at kroki.io has no terms, privacy policy, status page or published rate limit. The CLI page limits the demonstration server to reasonable, non-commercial use", "The server has no authentication on its convert endpoints and binds all interfaces on port 8000 by default. The version is 0.33.0, with no 1.0" ], "agentNotes": [ "Send `POST /\u003ctype\u003e/\u003cformat\u003e` with `Content-Type: text/plain` and the diagram as the body. This avoids the deflate and base64 encoding that GET needs", "Send `Accept: application/json` on a JSON request to get errors as `{\"error\": {\"code\", \"message\"}}`. With an SVG Accept header the error arrives as an image", "Call `GET /health` first to list the diagram types and library versions the instance has. Mermaid, BPMN, Excalidraw and diagrams.net need companion containers", "Run 0.32.1 or later before rendering untrusted text. Earlier versions allow remote code execution through `/tikz/svg` and file reads in `SECURE` mode", "Self-host for private diagrams with `docker run -p8000:8000 yuzutech/kroki`, and set `KROKI_LISTEN=127.0.0.1:8000` or a network rule, since the server has no authentication" ], "metrics": { "kind": "local", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 59.2 } ], "editorialScores": { "ergonomics": 70, "maintenance": 86, "payments": 60, "reliability": 74, "schema": 48, "security": 56, "transparency": 67 }, "provenanceScore": 56 }, "connect": { "install": "docker run -p8000:8000 yuzutech/kroki", "http": "curl https://kroki.io/graphviz/svg --data-raw 'digraph G {Hello-\u003eWorld}'" }, "letme": { "capability": "https://letme.dev/diagram.as-code", "tool": "https://letme.dev/kroki" }, "area": "design-diagrams", "provenance": { "legalEntity": "Yuzu tech, a French software firm. No registered legal form found", "domain": "kroki.io", "domainRegistered": "2019-01-06", "endpointOnVendorDomain": true, "terms": "", "privacy": "", "statusPage": "", "changelog": "https://github.com/yuzutech/kroki/blob/main/CHANGELOG.md", "securityTxt": "none", "checked": "2026-10-09", "notes": [ "The kroki.io home page says Kroki is built and maintained by Yuzu tech, and links https://yuzutech.fr, whose pages name no legal form or registration number. `LICENSE` reads Copyright (c) 2020-present Kroki", "No terms or privacy document was found on kroki.io or docs.kroki.io, for the software or for the public instance. The MIT licence stands in for the software", "https://kroki.io/.well-known/security.txt answered 404 on 9 October 2026. `SECURITY.md` asks for reports through a private GitHub security advisory", "The lead wrote the vendor as Yuzutech. The site writes Yuzu tech, and the GitHub organisation is `yuzutech`", "The endpoint on the vendor's domain is the free public instance. The listing grades the server an owner runs" ], "score": 56 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/kroki.json", "live": { "slug": "kroki", "versions": [ { "registry": "github", "name": "yuzutech/kroki", "version": "v0.33.0", "released": "2026-10-05", "seenAt": "2026-10-09T17:00:57.82489933Z" } ], "githubStars": 4365, "pages": [ { "url": "https://raw.githubusercontent.com/yuzutech/kroki/main/CHANGELOG.md", "kind": "changelog", "status": 200, "checkedAt": "2026-10-09T18:46:31.151891385Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "3e34fa594488" } ], "updatedAt": "2026-10-09T18:46:31.151891385Z" } }, "answer": "Kroki scores 59.2 (C) on agent readiness against Mermaid Chart MCP's 31.4 (F), and leads in every scored category.", "b": { "slug": "mermaid-chart", "name": "Mermaid Chart MCP", "vendor": "Mermaid Chart", "vendorUrl": "https://mermaid.ai", "kind": "mcp", "category": "diagramming", "summary": "Hosted MCP server for Mermaid diagrams from mermaid.ai.", "url": "https://www.anchorterminal.com/tools/mermaid-chart", "markdownUrl": "https://www.anchorterminal.com/tools/mermaid-chart.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/mermaid-chart.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/mermaid-chart.json", "transports": [ "streamable-http", "sse" ], "remoteUrl": "https://mcp.mermaid.ai/mcp", "packages": [ { "registry": "npm", "name": "@mermaidchart/sdk" } ], "auth": "mixed", "authNotes": "Render and validation tools need no auth. Account tools need a Mermaid Chart token generated in account settings and sent as the Authorization header (the docs show the raw token, no Bearer prefix). The TypeScript SDK uses OAuth.", "pricing": "freemium", "pricingNotes": "Basic $0 with 3 diagrams and 15 AI credits. Plus $10 a user a month billed yearly ($12 monthly) with unlimited diagrams and 300 AI credits a year. Premium $20 billed yearly ($24 monthly) with 2,000 AI credits a year and free viewer seats. Enterprise custom. The render tools on the MCP server are free without an account (https://mermaid.ai/pricing).", "priceSummary": "$12 / seat-mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402 support in docs or pricing (checked 2026-09-30).", "endpoints": [] }, "toolCount": 25, "popularity": { "githubStars": null, "npmWeekly": 395, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://mermaid.ai/docs/ai/mcp-server", "registryName": "com.mermaidchart/mermaid-mcp", "capabilities": [ "diagram.create", "diagram.as-code", "diagram.edit", "diagram.export" ], "tags": [ "hosted", "freemium", "free-tier", "mcp", "diagram-as-code", "closed-source" ], "lastRelease": "2026-09-17", "graded": true, "anchor": { "graded": true, "score": 31.4, "grade": "F", "agentReady": false, "rank": 939, "ranked": true, "rankOf": 950, "categoryRank": 14, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 34, "maintenance": 53, "payments": 45, "reliability": 15, "schema": 32, "security": 20, "transparency": 45 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "Validation and rendering work with no account or key. Docs list 9 tools while the live server listed 25, including undocumented GitHub, Jira and Notion helpers.", "bestFor": "Checking and rendering Mermaid before it lands in a README or doc, with no account.", "strengths": [ "Validation and rendering work with no account or key", "Mermaid is plain-text diagram-as-code that renders natively on GitHub and many docs tools", "Hosted, nothing to install, streamable HTTP and SSE", "Official MIT TypeScript SDK, release 0.2.8 on 17 September 2026" ], "weaknesses": [ "Docs list 9 tools while the live server listed 25, including undocumented GitHub, Jira and Notion helpers", "Account tools take a raw token in the Authorization header, with no OAuth or scopes", "No status page, rate limits, changelog, security page or SLA", "Privacy policy last updated September 2024 and names no AI provider", "No public REST API reference, and API access is by application form" ], "agentNotes": [ "Call `validate_and_render_mermaid_diagram` to check syntax before committing Mermaid to a repo. It needs no token", "Only add the token if you need to save into Mermaid Chart projects. It reaches every project on the account", "If you only need a picture, the open-source mermaid-cli renders locally with no network call", "Use mcp.mermaid.ai. The registry still lists the older mcp.mermaidchart.com host" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 2.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "F", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 31.4 } ], "editorialScores": { "ergonomics": 34, "maintenance": 53, "payments": 45, "reliability": 15, "schema": 32, "security": 20, "transparency": 29 }, "provenanceScore": 60 }, "connect": { "claudeCode": "claude mcp add --transport http mermaid https://mcp.mermaid.ai/mcp --header \"Authorization: $MERMAID_CHART_TOKEN\"", "config": { "mcpServers": { "mermaid": { "headers": { "Authorization": "${MERMAID_CHART_TOKEN}" }, "type": "http", "url": "https://mcp.mermaid.ai/mcp" } } } }, "letme": { "capability": "https://letme.dev/diagram.create", "tool": "https://letme.dev/mermaid-chart" }, "area": "design-diagrams", "unitPrices": [ { "item": "Plus plan", "unit": "seat-month", "usd": 12, "note": "billed monthly, $10 billed yearly. 300 AI credits a year" }, { "item": "Premium plan", "unit": "seat-month", "usd": 24, "note": "billed monthly, $20 billed yearly. 2,000 AI credits a year" } ], "provenance": { "legalEntity": "Mermaid Chart Inc.", "domain": "mermaid.ai", "domainRegistered": "2017-12-16", "domainNote": "mermaid.ai was registered in 2017 and transferred on 2025-06-02. The company's earlier domain, mermaidchart.com, was registered on 2022-06-14 and now redirects here.", "endpointOnVendorDomain": true, "terms": "https://mermaid.ai/terms-and-conditions", "privacy": "https://mermaid.ai/web/privacy-policy", "statusPage": "", "changelog": "", "securityTxt": "unknown", "checked": "2026-10-01", "notes": [ "Mermaid Chart Inc., 548 Market Street, PMB 75432, San Francisco, CA 94104-5401 (privacy policy, last updated 13 September 2024)", "The terms are governed by Delaware law and give no postal address", "/.well-known/security.txt and /llms.txt on mermaid.ai returned 401 on 30 September, so neither could be read", "The official MCP registry entry, published 2025-09-18, still points at mcp.mermaidchart.com" ], "score": 60 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/mermaid-chart.json", "live": { "slug": "mermaid-chart", "probe": { "target": "https://mcp.mermaid.ai/mcp", "method": "mcp-initialize", "lastAt": "2026-10-10T01:37:58.431639683Z", "lastOk": true, "lastStatus": 401, "lastMs": 489, "lastNote": "asks for credentials", "authRequired": true, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 455, "p95ms24h": 536, "samples24h": 250, "samples30d": 2453, "days": [ { "date": "2026-09-30", "probes": 35, "ok": 35 }, { "date": "2026-10-01", "probes": 276, "ok": 276 }, { "date": "2026-10-02", "probes": 248, "ok": 248 }, { "date": "2026-10-03", "probes": 271, "ok": 271 }, { "date": "2026-10-04", "probes": 272, "ok": 272 }, { "date": "2026-10-05", "probes": 272, "ok": 272 }, { "date": "2026-10-06", "probes": 272, "ok": 272 }, { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 268, "ok": 268 }, { "date": "2026-10-09", "probes": 250, "ok": 250 }, { "date": "2026-10-10", "probes": 17, "ok": 17 } ] }, "versions": [ { "registry": "mcp-registry", "name": "com.mermaidchart/mermaid-mcp", "version": "1.0.0", "seenAt": "2026-10-09T02:57:46.004536428Z" }, { "registry": "npm", "name": "@mermaidchart/sdk", "version": "0.2.8", "seenAt": "2026-10-09T17:05:00.421801564Z" } ], "npmWeekly": 223, "securityTxt": { "url": "https://mermaid.ai/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-09T15:39:49.981066434Z" }, "domain": { "domain": "mermaid.ai", "registered": "2017-12-16", "source": "https://rdap.identitydigital.services/rdap/domain/mermaid.ai", "checkedAt": "2026-10-04T13:04:50.094930879Z" }, "pages": [ { "url": "https://mermaid.ai/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-10-09T18:41:57.851139214Z", "changedAt": "2026-10-08T18:21:57.946321301Z", "fingerprint": "a036d2b5700a" }, { "url": "https://mermaid.ai/privacy-policy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-01T13:14:15.99559282Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "6adb40a489d6" }, { "url": "https://mermaid.ai/web/privacy-policy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-09T18:42:02.585458709Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "6adb40a489d6" }, { "url": "https://mermaid.ai/terms-and-conditions", "kind": "terms", "status": 200, "checkedAt": "2026-10-09T18:42:00.498463296Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "828240567260" } ], "mcpTools": { "url": "https://mcp.mermaid.ai/mcp", "checkedAt": "2026-10-09T21:40:46.030062645Z", "status": "ok", "note": "last answer auth: asks for credentials before listing its tools; tools as last listed", "protocol": "2025-11-25", "tools": [ { "name": "validate_and_render_mermaid_diagram", "description": "SIMPLE RENDER TOOL - Renders Mermaid diagrams directly (Mermaid automatically validates during rendering). If successful, returns diagram image. If Mermaid validation fails, returns error details for fixing. One tool, one call, simple workflow.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server (e.g., 'claude', 'cursor', 'vscode', 'chatgpt', 'copilot') for analytics tracking.", "type": "string" }, "diagramType": { "description": "The type of Mermaid diagram (e.g., 'flowchart', 'sequenceDiagram', 'gantt').", "type": "string" }, "mermaidCode": { "description": "Mermaid code to render. Mermaid validates automatically during rendering - if invalid, tool returns error details for fixing.", "type": "string" }, "prompt": { "description": "A text description of the diagram to generate.", "type": "string" }, "useUrlShortener": { "default": true, "description": "Whether to use URL shortening for the Mermaid link. Defaults to true, set to false to disable shortening.", "type": "boolean" } }, "required": [ "prompt", "mermaidCode", "diagramType", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "get_diagram_title", "description": "Generate a descriptive title for a Mermaid diagram based on its content. This tool analyzes the diagram structure and content to suggest an appropriate title.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server (e.g., 'claude', 'cursor', 'vscode', 'chatgpt', 'copilot') for analytics tracking.", "type": "string" }, "currentTitle": { "description": "Optional: The current title of the diagram, if any, for context.", "type": "string" }, "diagramContent": { "description": "The Mermaid diagram content/code for which to generate a title.", "type": "string" }, "diagramType": { "description": "Optional: The type of Mermaid diagram (e.g., 'flowchart', 'sequenceDiagram', 'gantt') for better context in title generation.", "type": "string" } }, "required": [ "diagramContent", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "get_diagram_summary", "description": "Generate a concise summary for a Mermaid diagram based on its content. This tool provides prompts for the LLM to generate a brief summary (2-4 sentences) highlighting the primary flow, key decisions, and outcomes.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server (e.g., 'claude', 'cursor', 'vscode', 'chatgpt', 'copilot') for analytics tracking.", "type": "string" }, "contextHint": { "description": "Optional: Context hint to help generate a more accurate summary.", "type": "string" }, "diagramContent": { "description": "The Mermaid diagram content/code for which to generate a summary.", "type": "string" } }, "required": [ "diagramContent", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "search_mermaid_icons", "description": "Search for available Mermaid icons by provider or name. Returns icons in ready-to-use format with provider prefixes (e.g., 'aws:arch-amazon-ec2'). PERFORMANCE TIP: For faster searches, start with limit=10 and specific queries. If no suitable icons found, increase limit and retry. Supports AWS, Azure, GCP, and FontAwesome icon sets.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server (e.g., 'claude', 'cursor', 'vscode', 'chatgpt', 'copilot') for analytics tracking.", "type": "string" }, "limit": { "default": 10, "description": "Optional: Maximum number of results to return per provider. Defaults to 10 for performance. Increase if needed.", "type": "number" }, "provider": { "description": "Optional: Filter by specific provider ('aws', 'azure', 'gcp', 'fa'). If not provided, searches all providers.", "type": "string" }, "query": { "description": "Search query for icons (e.g., 'aws', 'azure', 'gcp', 'fa', 'lambda', 's3', 'database'). Use specific terms for better results.", "type": "string" } }, "required": [ "query", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "get_mermaid_syntax_document", "description": "Get comprehensive syntax documentation and examples for a specific Mermaid diagram type. Returns the official Mermaid.js documentation with syntax rules, examples, and usage instructions for the requested diagram type.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server (e.g., 'claude', 'cursor', 'vscode', 'chatgpt', 'copilot') for analytics tracking.", "type": "string" }, "diagramType": { "description": "The type of Mermaid diagram to get syntax documentation for (e.g., 'flowchart', 'sequenceDiagram', 'architecture-beta', 'gantt', 'gitgraph', 'classDiagram', 'stateDiagram', etc.).", "type": "string" } }, "required": [ "diagramType", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "list_tools", "description": "Lists all available MCP servers and their tools in the workspace.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "clientName": { "description": "OPTIONAL: The name of the client/agent using the MCP server (e.g., 'claude', 'cursor', 'vscode', 'chatgpt', 'copilot') for analytics tracking.", "type": "string" } }, "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "list_repos", "description": "List GitHub repositories for the authenticated user, or for an organization when `org` is set. REQUIRES: `Github-Token` header (HTTP) or `GITHUB_TOKEN` / `GH_TOKEN` in the server environment.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "type": "string" }, "org": { "description": "Optional: organization login. If set, lists that org's repositories; otherwise lists repos for the authenticated user.", "type": "string" }, "page": { "default": 1, "maximum": 9007199254740991, "minimum": 1, "type": "integer" }, "per_page": { "default": 30, "maximum": 100, "minimum": 1, "type": "integer" }, "type": { "default": "all", "description": "User repo filter; ignored when `org` is set.", "enum": [ "all", "owner", "member", "public", "private" ], "type": "string" } }, "required": [ "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "list_mermaid_files", "description": "List .mmd Mermaid files in a GitHub repository (code search with tree fallback). REQUIRES: `Github-Token` header (HTTP) or GITHUB_TOKEN / GH_TOKEN.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "type": "string" }, "owner": { "description": "Repository owner (user or organization).", "type": "string" }, "ref": { "description": "Optional branch, tag, or commit for tree fallback when code search is unavailable.", "type": "string" }, "repo": { "description": "Repository name.", "type": "string" } }, "required": [ "owner", "repo", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "read_mermaid_file", "description": "Read a single .mmd file from a GitHub repository. Only paths ending in .mmd are allowed. REQUIRES: `Github-Token` header (HTTP) or GITHUB_TOKEN / GH_TOKEN.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "type": "string" }, "owner": { "type": "string" }, "path": { "description": "Path to the .mmd file in the repository.", "type": "string" }, "ref": { "description": "Optional: branch, tag, or commit SHA; defaults to the default branch.", "type": "string" }, "repo": { "type": "string" } }, "required": [ "owner", "repo", "path", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "create_pr", "description": "Create a new branch (git ref), one commit from the base tree with your file changes, then open a pull request in the same repository. REQUIRES: `Github-Token` (HTTP) or GITHUB_TOKEN with `contents: write` (and no existing branch with the same `headBranch` name).", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "baseBranch": { "description": "Branch to base the PR on (e.g. main). Defaults to the repo default branch.", "type": "string" }, "body": { "description": "PR description (markdown).", "type": "string" }, "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "type": "string" }, "commitMessage": { "description": "Single commit message for the file changes.", "type": "string" }, "files": { "description": "Files to add or update.", "items": { "properties": { "content": { "description": "Full UTF-8 file content.", "type": "string" }, "path": { "description": "Repo-relative file path.", "type": "string" } }, "required": [ "path", "content" ], "type": "object" }, "minItems": 1, "type": "array" }, "headBranch": { "description": "Name of the new branch (must not already exist on the remote).", "type": "string" }, "owner": { "type": "string" }, "repo": { "type": "string" }, "title": { "type": "string" } }, "required": [ "owner", "repo", "headBranch", "title", "body", "commitMessage", "files", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": false } }, { "name": "push_file", "description": "Create or update a single file on a given branch in a GitHub repository. REQUIRES: `Github-Token` (HTTP) or GITHUB_TOKEN with contents write access.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "branch": { "description": "Branch to commit to.", "type": "string" }, "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "type": "string" }, "content": { "description": "Full file content.", "type": "string" }, "message": { "description": "Commit message.", "type": "string" }, "owner": { "type": "string" }, "path": { "type": "string" }, "repo": { "type": "string" }, "sha": { "description": "Existing blob SHA to update; omit to create or to let the service detect.", "type": "string" } }, "required": [ "owner", "repo", "path", "content", "branch", "message", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": false } }, { "name": "list_pulls", "description": "List pull requests for a GitHub repository. REQUIRES: `Github-Token` (HTTP) or GITHUB_TOKEN / GH_TOKEN.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "type": "string" }, "owner": { "type": "string" }, "page": { "default": 1, "maximum": 9007199254740991, "minimum": 1, "type": "integer" }, "per_page": { "default": 30, "maximum": 100, "minimum": 1, "type": "integer" }, "repo": { "type": "string" }, "state": { "default": "open", "enum": [ "open", "closed", "all" ], "type": "string" } }, "required": [ "owner", "repo", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "list_branches", "description": "List or resolve branch names. **List mode (default):** one `GET /repos/.../branches?per_page=100\u0026page=1` — at most 100 names, A–Z sorted in the response; `has_more` if a full page was returned. **Resolve mode:** set `branch_name` for a single `GET` branch (404 if missing). At most one GitHub API call. REQUIRES: `Github-Token` (HTTP) or GITHUB_TOKEN / GH_TOKEN.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "branch_name": { "description": "Exact branch name. When non-empty, returns that branch only. Omit to fetch the first 100 branches only.", "type": "string" }, "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "type": "string" }, "owner": { "type": "string" }, "repo": { "type": "string" } }, "required": [ "owner", "repo", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "list_issues", "description": "List issues for a repository (excludes pull requests). REQUIRES: `Github-Token` (HTTP) or GITHUB_TOKEN / GH_TOKEN.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "type": "string" }, "direction": { "default": "desc", "enum": [ "asc", "desc" ], "type": "string" }, "labels": { "description": "Comma-separated label names (GitHub API format).", "type": "string" }, "owner": { "type": "string" }, "page": { "default": 1, "maximum": 9007199254740991, "minimum": 1, "type": "integer" }, "per_page": { "default": 30, "maximum": 100, "minimum": 1, "type": "integer" }, "repo": { "type": "string" }, "since": { "description": "ISO 8601: only issues updated at or after this time.", "type": "string" }, "sort": { "default": "created", "enum": [ "created", "updated", "comments" ], "type": "string" }, "state": { "default": "open", "enum": [ "open", "closed", "all" ], "type": "string" } }, "required": [ "owner", "repo", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "create_issue", "description": "Create an issue in a GitHub repository. REQUIRES: `Github-Token` (HTTP) or GITHUB_TOKEN with issues write if creating issues in private repos.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "body": { "description": "Issue body in markdown.", "type": "string" }, "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "type": "string" }, "labels": { "description": "Label names (must already exist in the repository).", "items": { "type": "string" }, "type": "array" }, "owner": { "type": "string" }, "repo": { "type": "string" }, "title": { "type": "string" } }, "required": [ "owner", "repo", "title", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": false } }, { "name": "get_issue_comments", "description": "List comments on an issue by issue number. REQUIRES: `Github-Token` (HTTP) or GITHUB_TOKEN / GH_TOKEN.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "type": "string" }, "issue_number": { "description": "Issue number (not a PR number unless the PR is also addressed as an issue on GitHub).", "maximum": 9007199254740991, "minimum": 1, "type": "integer" }, "owner": { "type": "string" }, "page": { "default": 1, "maximum": 9007199254740991, "minimum": 1, "type": "integer" }, "per_page": { "default": 30, "maximum": 100, "minimum": 1, "type": "integer" }, "repo": { "type": "string" } }, "required": [ "owner", "repo", "issue_number", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "get_pull_comments", "description": "Get all pull request comments: both issue/PR thread comments and inline review comments, with a `type` of `issue_thread` or `review` per item. REQUIRES: `Github-Token` (HTTP) or GITHUB_TOKEN / GH_TOKEN.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "type": "string" }, "owner": { "type": "string" }, "page": { "default": 1, "maximum": 9007199254740991, "minimum": 1, "type": "integer" }, "per_page": { "default": 30, "maximum": 100, "minimum": 1, "type": "integer" }, "pull_number": { "description": "Pull request number.", "maximum": 9007199254740991, "minimum": 1, "type": "integer" }, "repo": { "type": "string" } }, "required": [ "owner", "repo", "pull_number", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "generate_ticket_dependency_tree", "description": "Generate a Mermaid flowchart that visualises Jira issue dependency links for a project. Each node shows the ticket key, summary, and status, and is a clickable link to the ticket. Dashed nodes represent issues linked from outside the current filter set.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "assignee": { "description": "Filter by assignee — Jira account ID, display name, or 'currentUser()'.", "type": "string" }, "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "minLength": 1, "type": "string" }, "colorMode": { "default": "light", "description": "Color scheme for the diagram: 'light' (default pastel fills), 'dark' (deep fills for dark backgrounds), or 'none' (no fill/stroke overrides, inherits the Mermaid theme).", "enum": [ "light", "dark", "none" ], "type": "string" }, "createdAfter": { "description": "Include only issues created on or after this date, ISO format: '2024-01-15'.", "type": "string" }, "createdBefore": { "description": "Include only issues created on or before this date, ISO format: '2024-03-31'.", "type": "string" }, "maxResults": { "default": 50, "description": "Target number of issues to render in the tree (1–100, default 50).", "maximum": 100, "minimum": 1, "type": "integer" }, "projectKey": { "description": "REQUIRED: Jira project key, e.g. 'PROJ' or 'MYTEAM'. Used as the base JQL project filter.", "minLength": 1, "type": "string" }, "reporter": { "description": "Filter by reporter — Jira account ID or display name.", "type": "string" }, "sprint": { "description": "Filter by sprint name or numeric ID, e.g. 'Sprint 12' or '42'.", "type": "string" }, "status": { "description": "Filter by issue status, e.g. 'In Progress', 'To Do', 'Done'.", "type": "string" }, "useUrlShortener": { "default": true, "description": "Shorten the preview/edit URL via Short.io. Disable to get the full unshortened URL (default true).", "type": "boolean" } }, "required": [ "projectKey", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "generate_jira_kanban_board", "description": "Generate a Mermaid kanban board from Jira issues. Issues are grouped into columns by their current status and ordered by workflow stage (To Do → In Progress → Done). Each card shows the issue summary and is a clickable link to the ticket, with optional assignee and priority badges.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "assignee": { "description": "Filter by assignee — Jira account ID, display name, or 'currentUser()'.", "type": "string" }, "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "minLength": 1, "type": "string" }, "issueType": { "description": "Filter by issue type, e.g. 'Story', 'Bug', 'Task'.", "type": "string" }, "maxResults": { "default": 50, "description": "Maximum number of issues to fetch (1–100, default 50).", "maximum": 100, "minimum": 1, "type": "integer" }, "projectKey": { "description": "REQUIRED: Jira project key, e.g. 'PROJ' or 'MYTEAM'.", "minLength": 1, "type": "string" }, "sprint": { "description": "Filter by sprint name or numeric ID, e.g. 'Sprint 12' or '42'.", "type": "string" } }, "required": [ "projectKey", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "generate_ticket_diagram", "description": "Generate a Mermaid flowchart centred on a single Jira ticket. Fetches the ticket's subtasks, parent, issue links, and recent comments in one call. The focal ticket is highlighted in indigo; subtasks are grouped in a subgraph; issue links use colour-coded arrows (red thick = blocks, cyan dashed = relates to); comments appear in a rose subgraph.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "minLength": 1, "type": "string" }, "colorMode": { "default": "light", "description": "Color scheme for the diagram: 'light' (default pastel fills), 'dark' (deep fills for dark backgrounds), or 'none' (no fill/stroke overrides, inherits the Mermaid theme).", "enum": [ "light", "dark", "none" ], "type": "string" }, "ticketKey": { "description": "REQUIRED: Jira issue key, e.g. 'MC-123' or 'PROJ-42'.", "minLength": 1, "type": "string" } }, "required": [ "ticketKey", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "generate_ticket_timeline", "description": "Generate a Mermaid diagram showing the history of a single Jira ticket using its changelog. Two views are available:\n- **state**: stateDiagram-v2 showing all status transitions with dates and authors, nodes coloured by status category.\n- **timeline** (default): Mermaid timeline grouped by month, showing status changes, assignee changes, priority changes, sprint moves, and resolutions.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "minLength": 1, "type": "string" }, "ticketKey": { "description": "REQUIRED: Jira issue key, e.g. 'MC-123' or 'PROJ-42'.", "minLength": 1, "type": "string" }, "view": { "default": "timeline", "description": "Diagram view to generate. 'state' shows status transitions; 'timeline' shows all field changes over time.", "enum": [ "state", "timeline" ], "type": "string" } }, "required": [ "ticketKey", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "get_notion_page_mermaid_diagrams", "description": "Extract all Mermaid code blocks from a Notion page. Returns block ID, diagram code, and optional caption for each block.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "type": "string" }, "pageUrl": { "description": "URL of the Notion page (e.g. https://www.notion.so/My-Page-abc123...).", "format": "uri", "type": "string" } }, "required": [ "pageUrl", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "get_notion_mermaid_diagram_by_block_id", "description": "Retrieve a single Mermaid diagram block by its block ID. Returns the diagram code and optional caption.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "blockId": { "description": "The Notion block ID of the mermaid code block (e.g. from get_notion_page_mermaid_diagrams).", "type": "string" }, "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "type": "string" } }, "required": [ "blockId", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": true } }, { "name": "update_notion_mermaid_diagram", "description": "Update the Mermaid source code (and optional caption) of an existing mermaid code block by its block ID.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "blockId": { "description": "The Notion block ID of the mermaid code block to update.", "type": "string" }, "caption": { "description": "Optional new caption. Omit to clear the existing caption.", "type": "string" }, "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "type": "string" }, "code": { "description": "New Mermaid diagram source code.", "type": "string" } }, "required": [ "blockId", "code", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": false } }, { "name": "insert_notion_mermaid_diagram", "description": "Append a Mermaid diagram as a code block to a Notion page. The block is added at the end of the page content.", "inputSchema": { "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "caption": { "description": "Optional caption displayed below the code block.", "type": "string" }, "clientName": { "description": "REQUIRED: The name of the client/agent using the MCP server for analytics tracking.", "type": "string" }, "code": { "description": "Mermaid diagram source code.", "type": "string" }, "pageUrl": { "description": "URL of the Notion page to insert the diagram into.", "format": "uri", "type": "string" } }, "required": [ "pageUrl", "code", "clientName" ], "type": "object" }, "annotations": { "readOnlyHint": false } } ], "schemaTokens": 6198, "changedAt": "2026-09-30T21:57:02.278667952Z", "check": { "checker": "anchor-check/1.0", "totalTokens": 6198, "counts": { "error": 0, "note": 1, "warn": 11 }, "findings": [ { "rule": "TC11", "severity": "warn", "tool": "create_issue", "message": "3 parameters without a description: owner, repo, title", "fix": "Describe each one: format, units, an example, and what happens when it's left out." }, { "rule": "TC11", "severity": "warn", "tool": "create_pr", "message": "3 parameters without a description: owner, repo, title", "fix": "Describe each one: format, units, an example, and what happens when it's left out." }, { "rule": "TC11", "severity": "warn", "tool": "get_issue_comments", "message": "4 parameters without a description: owner, page, per_page, repo", "fix": "Describe each one: format, units, an example, and what happens when it's left out." }, { "rule": "TC11", "severity": "warn", "tool": "get_pull_comments", "message": "4 parameters without a description: owner, page, per_page, repo", "fix": "Describe each one: format, units, an example, and what happens when it's left out." }, { "rule": "TC11", "severity": "warn", "tool": "list_branches", "message": "2 parameters without a description: owner, repo", "fix": "Describe each one: format, units, an example, and what happens when it's left out." }, { "rule": "TC11", "severity": "warn", "tool": "list_issues", "message": "7 parameters without a description: direction, owner, page, per_page, repo, sort and 1 more", "fix": "Describe each one: format, units, an example, and what happens when it's left out." }, { "rule": "TC11", "severity": "warn", "tool": "list_pulls", "message": "5 parameters without a description: owner, page, per_page, repo, state", "fix": "Describe each one: format, units, an example, and what happens when it's left out." }, { "rule": "TC11", "severity": "warn", "tool": "list_repos", "message": "2 parameters without a description: page, per_page", "fix": "Describe each one: format, units, an example, and what happens when it's left out." }, { "rule": "TC11", "severity": "warn", "tool": "push_file", "message": "3 parameters without a description: owner, path, repo", "fix": "Describe each one: format, units, an example, and what happens when it's left out." }, { "rule": "TC11", "severity": "warn", "tool": "read_mermaid_file", "message": "2 parameters without a description: owner, repo", "fix": "Describe each one: format, units, an example, and what happens when it's left out." }, { "rule": "TC21", "severity": "warn", "tool": "list_pulls", "message": "described almost the same as list_issues (82% of the same words)", "fix": "Say in each description when to use it instead of the other." }, { "rule": "TC24", "severity": "note", "message": "25 of 25 tools have no outputSchema", "fix": "Declare outputSchema for tools that return structured data, and return structuredContent that matches it." } ] } }, "updatedAt": "2026-10-10T01:37:58.431639683Z" } }, "facts": [ { "a": "HTTP API", "b": "MCP server", "name": "Kind" }, { "a": "Yuzu tech", "b": "Mermaid Chart", "name": "Vendor" }, { "a": "no (local only)", "b": "https://mcp.mermaid.ai/mcp", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "Streamable HTTP, SSE (legacy)", "name": "Transports" }, { "a": "None", "b": "OAuth or key", "name": "Auth" }, { "a": "Free", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "MIT", "b": "none", "name": "Licence" }, { "a": "none", "b": "25", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "no", "b": "no", "name": "llms.txt" }, { "a": "not listed", "b": "com.mermaidchart/mermaid-mcp", "name": "MCP registry" }, { "a": "2026-10-05", "b": "2026-09-17", "name": "Last release" }, { "a": "no document linked", "b": "no date given", "name": "Terms last updated" }, { "a": "no document linked", "b": "2024-09-13", "name": "Privacy policy last updated" }, { "a": "", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "", "b": "not found in the text", "name": "Terms restrict automated access" }, { "a": "", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "", "b": "not found in the text", "name": "Arbitration or class-action waiver" }, { "a": "4.4k stars", "b": "395 npm/wk", "name": "Popularity" }, { "a": "none", "b": "2.5/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Kroki scores 59.2 (C) on agent readiness against Mermaid Chart MCP's 31.4 (F), and leads in every scored category.", "question": "Which is better for AI agents, Kroki or Mermaid Chart MCP?" }, { "answer": "Kroki needs no key. Mermaid Chart MCP takes an API key or an OAuth sign-in.", "question": "Do Kroki and Mermaid Chart MCP need an API key?" }, { "answer": "No hosted endpoint is listed for Kroki. Mermaid Chart MCP has a hosted endpoint at https://mcp.mermaid.ai/mcp.", "question": "Can an agent call Kroki and Mermaid Chart MCP without installing anything?" }, { "answer": "Kroki is open source (MIT). No open-source release is listed for Mermaid Chart MCP.", "question": "Are Kroki and Mermaid Chart MCP open source?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 74 against 15", "Schema \u0026 documentation, 48 against 32", "Agent ergonomics, 70 against 34", "Security \u0026 auth, 56 against 20", "Payments \u0026 pricing, 60 against 45", "Maintenance \u0026 community, 86 against 53", "Transparency \u0026 trust, 62 against 45" ], "also": [ "No key needed to call it", "Open source" ], "goodFor": "Agents that write diagrams in several text formats and want one render endpoint, on a private network or through the public instance for non-sensitive diagrams.", "slug": "kroki", "watchFor": "GHSA-wmpp-fj9c-w766 (CVSS 9.8) allowed unauthenticated remote code execution on `/tikz/svg` in versions 0.21.0 up to 0.32.0, whatever the safe mode. Fixed 3 August 2026" }, { "aheadOn": null, "also": [ "A hosted endpoint, with nothing to install", "No incidents deducted, where Kroki loses 5 points for them" ], "goodFor": "Checking and rendering Mermaid before it lands in a README or doc, with no account.", "slug": "mermaid-chart", "watchFor": "Docs list 9 tools while the live server listed 25, including undocumented GitHub, Jira and Notion helpers" } ], "job": { "capability": "diagram.as-code", "name": "Diagrams as code" }, "others": [ { "json": "https://www.anchorterminal.com/compare/cloudviz-vs-kroki.json", "title": "Cloudviz API vs Kroki", "url": "https://www.anchorterminal.com/compare/cloudviz-vs-kroki" }, { "json": "https://www.anchorterminal.com/compare/cloudviz-vs-mermaid-chart.json", "title": "Cloudviz API vs Mermaid Chart MCP", "url": "https://www.anchorterminal.com/compare/cloudviz-vs-mermaid-chart" }, { "json": "https://www.anchorterminal.com/compare/diagrams-so-vs-kroki.json", "title": "Diagrams.so API + MCP vs Kroki", "url": "https://www.anchorterminal.com/compare/diagrams-so-vs-kroki" }, { "json": "https://www.anchorterminal.com/compare/diagrams-so-vs-mermaid-chart.json", "title": "Diagrams.so API + MCP vs Mermaid Chart MCP", "url": "https://www.anchorterminal.com/compare/diagrams-so-vs-mermaid-chart" }, { "json": "https://www.anchorterminal.com/compare/drawio-vs-kroki.json", "title": "draw.io + MCP vs Kroki", "url": "https://www.anchorterminal.com/compare/drawio-vs-kroki" }, { "json": "https://www.anchorterminal.com/compare/drawio-vs-mermaid-chart.json", "title": "draw.io + MCP vs Mermaid Chart MCP", "url": "https://www.anchorterminal.com/compare/drawio-vs-mermaid-chart" }, { "json": "https://www.anchorterminal.com/compare/eraser-vs-kroki.json", "title": "Eraser API + MCP vs Kroki", "url": "https://www.anchorterminal.com/compare/eraser-vs-kroki" }, { "json": "https://www.anchorterminal.com/compare/eraser-vs-mermaid-chart.json", "title": "Eraser API + MCP vs Mermaid Chart MCP", "url": "https://www.anchorterminal.com/compare/eraser-vs-mermaid-chart" }, { "json": "https://www.anchorterminal.com/compare/excalidraw-vs-kroki.json", "title": "Excalidraw vs Kroki", "url": "https://www.anchorterminal.com/compare/excalidraw-vs-kroki" }, { "json": "https://www.anchorterminal.com/compare/excalidraw-vs-mermaid-chart.json", "title": "Excalidraw vs Mermaid Chart MCP", "url": "https://www.anchorterminal.com/compare/excalidraw-vs-mermaid-chart" }, { "json": "https://www.anchorterminal.com/compare/kroki-vs-mural-mcp.json", "title": "Kroki vs Mural MCP", "url": "https://www.anchorterminal.com/compare/kroki-vs-mural-mcp" }, { "json": "https://www.anchorterminal.com/compare/kroki-vs-whimsical.json", "title": "Kroki vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/kroki-vs-whimsical" }, { "json": "https://www.anchorterminal.com/compare/lucid-vs-mermaid-chart.json", "title": "Lucid API + MCP vs Mermaid Chart MCP", "url": "https://www.anchorterminal.com/compare/lucid-vs-mermaid-chart" }, { "json": "https://www.anchorterminal.com/compare/mermaid-chart-vs-mural-mcp.json", "title": "Mermaid Chart MCP vs Mural MCP", "url": "https://www.anchorterminal.com/compare/mermaid-chart-vs-mural-mcp" }, { "json": "https://www.anchorterminal.com/compare/mermaid-chart-vs-plantuml.json", "title": "Mermaid Chart MCP vs PlantUML", "url": "https://www.anchorterminal.com/compare/mermaid-chart-vs-plantuml" }, { "json": "https://www.anchorterminal.com/compare/mermaid-chart-vs-structurizr.json", "title": "Mermaid Chart MCP vs Structurizr + MCP", "url": "https://www.anchorterminal.com/compare/mermaid-chart-vs-structurizr" }, { "json": "https://www.anchorterminal.com/compare/mermaid-chart-vs-tldraw.json", "title": "Mermaid Chart MCP vs tldraw SDK + MCP", "url": "https://www.anchorterminal.com/compare/mermaid-chart-vs-tldraw" }, { "json": "https://www.anchorterminal.com/compare/mermaid-chart-vs-whimsical.json", "title": "Mermaid Chart MCP vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/mermaid-chart-vs-whimsical" }, { "json": "https://www.anchorterminal.com/compare/d2-vs-kroki.json", "title": "D2 vs Kroki", "url": "https://www.anchorterminal.com/compare/d2-vs-kroki" }, { "json": "https://www.anchorterminal.com/compare/d2-vs-mermaid-chart.json", "title": "D2 vs Mermaid Chart MCP", "url": "https://www.anchorterminal.com/compare/d2-vs-mermaid-chart" }, { "json": "https://www.anchorterminal.com/compare/kroki-vs-lucid.json", "title": "Kroki vs Lucid API + MCP", "url": "https://www.anchorterminal.com/compare/kroki-vs-lucid" }, { "json": "https://www.anchorterminal.com/compare/kroki-vs-plantuml.json", "title": "Kroki vs PlantUML", "url": "https://www.anchorterminal.com/compare/kroki-vs-plantuml" }, { "json": "https://www.anchorterminal.com/compare/kroki-vs-structurizr.json", "title": "Kroki vs Structurizr + MCP", "url": "https://www.anchorterminal.com/compare/kroki-vs-structurizr" }, { "json": "https://www.anchorterminal.com/compare/kroki-vs-tldraw.json", "title": "Kroki vs tldraw SDK + MCP", "url": "https://www.anchorterminal.com/compare/kroki-vs-tldraw" } ], "scores": [ { "by": 59, "edge": "kroki", "key": "reliability", "kroki": 74, "mermaid-chart": 15, "name": "Reliability", "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 16, "edge": "kroki", "key": "schema", "kroki": 48, "mermaid-chart": 32, "name": "Schema \u0026 documentation", "weight": 13 }, { "by": 36, "edge": "kroki", "key": "ergonomics", "kroki": 70, "mermaid-chart": 34, "name": "Agent ergonomics", "weight": 13 }, { "by": 36, "edge": "kroki", "key": "security", "kroki": 56, "mermaid-chart": 20, "name": "Security \u0026 auth", "weight": 14 }, { "by": 15, "edge": "kroki", "key": "payments", "kroki": 60, "mermaid-chart": 45, "name": "Payments \u0026 pricing", "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 33, "edge": "kroki", "key": "maintenance", "kroki": 86, "mermaid-chart": 53, "name": "Maintenance \u0026 community", "weight": 7 }, { "by": 17, "edge": "kroki", "key": "transparency", "kroki": 62, "mermaid-chart": 45, "name": "Transparency \u0026 trust", "weight": 7 } ], "summary": "Kroki scores 59.2 (C) on agent readiness against Mermaid Chart MCP's 31.4 (F), and leads in every scored category. Both do diagrams as code.", "verdicts": { "kroki": "One unauthenticated POST with diagram text returns an image for 29 diagram types, and five versions shipped between 15 July and 5 October 2026. Four advisories were published in July and August 2026, one an unauthenticated remote code execution on `/tikz/svg`, all fixed. No OpenAPI file exists, and the public instance has no terms, privacy policy or status page.", "mermaid-chart": "Validation and rendering work with no account or key. Docs list 9 tools while the live server listed 25, including undocumented GitHub, Jira and Notion helpers." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/kroki-vs-mermaid-chart", "json": "https://www.anchorterminal.com/compare/kroki-vs-mermaid-chart.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/kroki-vs-mermaid-chart.md", "slim": "https://www.anchorterminal.com/compare/kroki-vs-mermaid-chart.min.md" }, "markdown": "Kroki scores 59.2 (C) on agent readiness against Mermaid Chart MCP's 31.4 (F), and leads in every scored category. Both do diagrams as code.\n\n- Kroki: grade C, 59.2/100, rank #558 of 950. Markdown https://www.anchorterminal.com/tools/kroki.md · JSON https://www.anchorterminal.com/api/v1/tools/kroki.json\n- Mermaid Chart MCP: grade F, 31.4/100, rank #939 of 950. Markdown https://www.anchorterminal.com/tools/mermaid-chart.md · JSON https://www.anchorterminal.com/api/v1/tools/mermaid-chart.json\n- Best diagramming APIs and diagram-as-code for AI agents: https://www.anchorterminal.com/best/diagramming/index.md\n- All 99 diagrams comparisons: https://www.anchorterminal.com/compare/diagramming/index.md\n\n## Which one, for what\n\n### Kroki (C)\n\nGood for: Agents that write diagrams in several text formats and want one render endpoint, on a private network or through the public instance for non-sensitive diagrams.\n\nAhead on:\n- Reliability, 74 against 15\n- Schema \u0026 documentation, 48 against 32\n- Agent ergonomics, 70 against 34\n- Security \u0026 auth, 56 against 20\n- Payments \u0026 pricing, 60 against 45\n- Maintenance \u0026 community, 86 against 53\n- Transparency \u0026 trust, 62 against 45\n\nAlso in its favour:\n- No key needed to call it\n- Open source\n\nWatch for: GHSA-wmpp-fj9c-w766 (CVSS 9.8) allowed unauthenticated remote code execution on `/tikz/svg` in versions 0.21.0 up to 0.32.0, whatever the safe mode. Fixed 3 August 2026\n\n### Mermaid Chart MCP (F)\n\nGood for: Checking and rendering Mermaid before it lands in a README or doc, with no account.\n\nAlso in its favour:\n- A hosted endpoint, with nothing to install\n- No incidents deducted, where Kroki loses 5 points for them\n\nWatch for: Docs list 9 tools while the live server listed 25, including undocumented GitHub, Jira and Notion helpers\n\n\n## Score by category\n\n| Category | Weight | Kroki | Mermaid Chart MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 74 | 15 | Kroki +59 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 48 | 32 | Kroki +16 |\n| Agent ergonomics | 13% (16.2 this run) | 70 | 34 | Kroki +36 |\n| Security \u0026 auth | 14% (17.5 this run) | 56 | 20 | Kroki +36 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 60 | 45 | Kroki +15 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 86 | 53 | Kroki +33 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 62 | 45 | Kroki +17 |\n| Negative events | ≤15 | -5 | 0 | |\n| **Total** | | **59.2 · C** | **31.4 · F** | |\n\n## Facts side by side\n\n| Fact | Kroki | Mermaid Chart MCP |\n| --- | --- | --- |\n| Kind | HTTP API | MCP server |\n| Vendor | Yuzu tech | Mermaid Chart |\n| Hosted endpoint | no (local only) | `https://mcp.mermaid.ai/mcp` |\n| Transports | HTTP | Streamable HTTP, SSE (legacy) |\n| Auth | None | OAuth or key |\n| Pricing | Free | Freemium |\n| x402 | no | no |\n| Licence | MIT | none |\n| Tools exposed | none | 25 |\n| Read-only variant documented | no | no |\n| llms.txt | no | no |\n| MCP registry | not listed | `com.mermaidchart/mermaid-mcp` |\n| Last release | 2026-10-05 | 2026-09-17 |\n| Terms last updated | no document linked | no date given |\n| Privacy policy last updated | no document linked | 2024-09-13 |\n| Customer content may train models | | not found in the text |\n| Terms restrict automated access | | not found in the text |\n| Terms restrict benchmarking | | yes |\n| Terms or service can change without notice | | not found in the text |\n| Arbitration or class-action waiver | | not found in the text |\n| Popularity | 4.4k stars | 395 npm/wk |\n| Agent reviews | none | 2.5/5 (2) |\n\n## Verdicts\n\n**Kroki.** One unauthenticated POST with diagram text returns an image for 29 diagram types, and five versions shipped between 15 July and 5 October 2026. Four advisories were published in July and August 2026, one an unauthenticated remote code execution on `/tikz/svg`, all fixed. No OpenAPI file exists, and the public instance has no terms, privacy policy or status page.\n\n**Mermaid Chart MCP.** Validation and rendering work with no account or key. Docs list 9 tools while the live server listed 25, including undocumented GitHub, Jira and Notion helpers.\n\n## Before you call either\n\n### Kroki\n\n1. Send `POST /\u003ctype\u003e/\u003cformat\u003e` with `Content-Type: text/plain` and the diagram as the body. This avoids the deflate and base64 encoding that GET needs\n2. Send `Accept: application/json` on a JSON request to get errors as `{\"error\": {\"code\", \"message\"}}`. With an SVG Accept header the error arrives as an image\n3. Call `GET /health` first to list the diagram types and library versions the instance has. Mermaid, BPMN, Excalidraw and diagrams.net need companion containers\n4. Run 0.32.1 or later before rendering untrusted text. Earlier versions allow remote code execution through `/tikz/svg` and file reads in `SECURE` mode\n5. Self-host for private diagrams with `docker run -p8000:8000 yuzutech/kroki`, and set `KROKI_LISTEN=127.0.0.1:8000` or a network rule, since the server has no authentication\n\n### Mermaid Chart MCP\n\n1. Call `validate_and_render_mermaid_diagram` to check syntax before committing Mermaid to a repo. It needs no token\n2. Only add the token if you need to save into Mermaid Chart projects. It reaches every project on the account\n3. If you only need a picture, the open-source mermaid-cli renders locally with no network call\n4. Use mcp.mermaid.ai. The registry still lists the older mcp.mermaidchart.com host\n\n## Questions\n\n### Which is better for AI agents, Kroki or Mermaid Chart MCP?\n\nKroki scores 59.2 (C) on agent readiness against Mermaid Chart MCP's 31.4 (F), and leads in every scored category.\n\n### Do Kroki and Mermaid Chart MCP need an API key?\n\nKroki needs no key. Mermaid Chart MCP takes an API key or an OAuth sign-in.\n\n### Can an agent call Kroki and Mermaid Chart MCP without installing anything?\n\nNo hosted endpoint is listed for Kroki. Mermaid Chart MCP has a hosted endpoint at https://mcp.mermaid.ai/mcp.\n\n### Are Kroki and Mermaid Chart MCP open source?\n\nKroki is open source (MIT). No open-source release is listed for Mermaid Chart MCP.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/kroki-vs-mermaid-chart.json, and with the fewest tokens: https://www.anchorterminal.com/compare/kroki-vs-mermaid-chart.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"kroki\", \"b\": \"mermaid-chart\"}`. From a terminal: `anchor compare kroki mermaid-chart`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/kroki.json and https://www.anchorterminal.com/api/v1/tools/mermaid-chart.json\n\n## Other comparisons with Kroki or Mermaid Chart MCP\n\n- [Cloudviz API vs Kroki](https://www.anchorterminal.com/compare/cloudviz-vs-kroki.md)\n- [Cloudviz API vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/cloudviz-vs-mermaid-chart.md)\n- [Diagrams.so API + MCP vs Kroki](https://www.anchorterminal.com/compare/diagrams-so-vs-kroki.md)\n- [Diagrams.so API + MCP vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/diagrams-so-vs-mermaid-chart.md)\n- [draw.io + MCP vs Kroki](https://www.anchorterminal.com/compare/drawio-vs-kroki.md)\n- [draw.io + MCP vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/drawio-vs-mermaid-chart.md)\n- [Eraser API + MCP vs Kroki](https://www.anchorterminal.com/compare/eraser-vs-kroki.md)\n- [Eraser API + MCP vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/eraser-vs-mermaid-chart.md)\n- [Excalidraw vs Kroki](https://www.anchorterminal.com/compare/excalidraw-vs-kroki.md)\n- [Excalidraw vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/excalidraw-vs-mermaid-chart.md)\n- [Kroki vs Mural MCP](https://www.anchorterminal.com/compare/kroki-vs-mural-mcp.md)\n- [Kroki vs Whimsical MCP](https://www.anchorterminal.com/compare/kroki-vs-whimsical.md)\n- [Lucid API + MCP vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/lucid-vs-mermaid-chart.md)\n- [Mermaid Chart MCP vs Mural MCP](https://www.anchorterminal.com/compare/mermaid-chart-vs-mural-mcp.md)\n- [Mermaid Chart MCP vs PlantUML](https://www.anchorterminal.com/compare/mermaid-chart-vs-plantuml.md)\n- [Mermaid Chart MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/mermaid-chart-vs-structurizr.md)\n- [Mermaid Chart MCP vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/mermaid-chart-vs-tldraw.md)\n- [Mermaid Chart MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/mermaid-chart-vs-whimsical.md)\n- [D2 vs Kroki](https://www.anchorterminal.com/compare/d2-vs-kroki.md)\n- [D2 vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/d2-vs-mermaid-chart.md)\n- [Kroki vs Lucid API + MCP](https://www.anchorterminal.com/compare/kroki-vs-lucid.md)\n- [Kroki vs PlantUML](https://www.anchorterminal.com/compare/kroki-vs-plantuml.md)\n- [Kroki vs Structurizr + MCP](https://www.anchorterminal.com/compare/kroki-vs-structurizr.md)\n- [Kroki vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/kroki-vs-tldraw.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-10", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.4", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Kroki vs Mermaid Chart MCP", "url": "" } ], "description": "Kroki scores 59.2 (C) to Mermaid Chart MCP's 31.4 (F) for diagrams as code. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "Kroki C 59.2", "Mermaid Chart MCP F 31.4", "scores" ], "h1": "Kroki vs Mermaid Chart MCP", "image": "https://www.anchorterminal.com/assets/og/compare-kroki-vs-mermaid-chart.png", "path": "/compare/kroki-vs-mermaid-chart", "published": "2026-10-01", "section": "tools", "title": "Kroki vs Mermaid Chart MCP for AI agents in 2026: scores and prices", "toc": null, "updated": "2026-10-09", "url": "https://www.anchorterminal.com/compare/kroki-vs-mermaid-chart" }, "tokens": { "markdown": 2450, "slim": 730 }, "version": 1 }