{ "data": { "a": { "slug": "ai-diagram-maker-mcp", "name": "AI Diagram Maker MCP", "vendor": "AI Diagram Maker (Rajasekar Elango)", "vendorUrl": "https://www.aidiagrammaker.com", "kind": "mcp", "category": "diagramming", "summary": "AI Diagram Maker MCP is an MIT-licensed MCP server, hosted or run with npx, that sends text, JSON, ASCII art, images or Mermaid to the AI Diagram Maker service and returns a D2 software diagram with an edit link.", "url": "https://www.anchorterminal.com/tools/ai-diagram-maker-mcp", "markdownUrl": "https://www.anchorterminal.com/tools/ai-diagram-maker-mcp.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/ai-diagram-maker-mcp.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/ai-diagram-maker-mcp.json", "dns": "ai-diagram-maker-mcp.grade.anchorterminal.com", "repo": "https://github.com/erajasekar/ai-diagram-maker-mcp", "license": "MIT for the MCP server. The AI Diagram Maker service it calls is closed, under terms last updated 24 September 2025", "transports": [ "streamable-http", "stdio" ], "remoteUrl": "https://mcp.aidiagrammaker.com/mcp", "packages": [ { "registry": "npm", "name": "ai-diagram-maker-mcp" } ], "auth": "api-key", "authNotes": "An API key created in the AI Diagram Maker app under Settings \u003e API Keys, shown once, named, and deactivated, reactivated or deleted from the same page. No scopes; the user guide says anyone with the key can access the account. The hosted server takes it in `X-ADM-API-Key` or `Authorization: Bearer`, the local server in `ADM_API_KEY`. No OAuth.", "pricing": "freemium", "pricingNotes": "Basic is free with 50 AI credits a month. Plus $10 a month ($96 a year) with 250 credits, Max $20 a month ($192 a year) with 500. One credit is 1,000 tokens, and extra credits can't be bought. Which plans include API and MCP use isn't stated.", "priceSummary": "$10 / mo", "where": "both", "x402": { "level": "no", "evidence": "Plans sold through Lemon Squeezy checkout links. No x402, MPP or L402 in the repository, the OpenAPI file or the site (checked 2026-11-06). Out of credits returns 402 with no payment requirements.", "endpoints": [] }, "toolCount": 5, "popularity": { "githubStars": null, "npmWeekly": 63, "pypiWeekly": null, "asOf": "2026-11-06" }, "docsUrl": "https://github.com/erajasekar/ai-diagram-maker-mcp#readme", "openapi": "https://github.com/erajasekar/ai-diagram-maker-mcp/blob/main/apispec/adm-openapi.json", "registryName": "io.github.erajasekar/ai-diagram-maker-mcp", "capabilities": [ "diagram.create", "diagram.architecture", "diagram.as-code", "diagram.export" ], "tags": [ "hosted", "local", "mcp", "remote-mcp", "stdio", "mcp-registry", "openapi", "api-key", "freemium", "d2", "mcp-apps" ], "lastRelease": "2026-04-10", "graded": true, "anchor": { "graded": true, "score": 43.8, "grade": "E", "agentReady": false, "rank": 1225, "ranked": true, "rankOf": 1486, "categoryRank": 13, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 66, "maintenance": 17, "payments": 20, "reliability": 30, "schema": 75, "security": 45, "transparency": 35 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-06" }, "negative": 0, "verdict": "Five compact, typed tools turn text, JSON, ASCII art, images or Mermaid into an editable D2 diagram, and the API documents its error and rate-limit responses. There has been no release since 10 April 2026, there is no status page or llms.txt, and the API key opens the whole account with no scopes.", "bestFor": "Quick architecture, sequence, ERD and flowchart diagrams from a coding agent, with a link to edit them.", "strengths": [ "Five tools with zod schemas, a diagramType enum and descriptions that say when to use each", "OpenAPI 3 file for the generate endpoint with documented 402, 422 and 429 responses", "A 429 body gives limit, remaining, resetAt and retryAfter", "Hosted endpoint with nothing to install, or a local npx server", "Output stays editable as D2 in the app and exports to SVG, PNG or Mermaid" ], "weaknesses": [ "Last release 3.0.8 on 10 April 2026, and the registry entry still says 1.0.0", "No status page, SLA, llms.txt, changelog or security policy found", "API keys have no scopes and give full account access", "Plans don't say whether API and MCP calls are included, and an open issue asks how hosted MCP credits are counted", "The privacy policy names no AI model providers or other processors" ], "agentNotes": [ "Send the key in the `X-ADM-API-Key` header to https://mcp.aidiagrammaker.com/mcp, never in the URL", "Pick `diagramType` from the enum when the user names one; leave it out to let the service choose", "On a 402 stop and tell the user credits are gone; they reset monthly and can't be topped up", "On a 429 wait for `retryAfter` seconds before the next call", "Give the user the returned diagram link so they can edit it, since the tools can't revise an existing diagram" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "E", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 43.8 } ], "editorialScores": { "ergonomics": 66, "maintenance": 17, "payments": 20, "reliability": 30, "schema": 75, "security": 45, "transparency": 28 }, "provenanceScore": 42, "checked": { "categories": { "ergonomics": "2026-11-06", "maintenance": "2026-11-06", "payments": "2026-11-06", "reliability": "2026-11-06", "schema": "2026-11-06", "security": "2026-11-06", "transparency": "2026-11-06" }, "last": "2026-11-06", "oldest": "2026-11-06", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "ADM_API_KEY=your_api_key npx ai-diagram-maker-mcp@latest", "claudeCode": "claude mcp add ai-diagram-maker -t stdio -e ADM_API_KEY=\u003capi_key\u003e -- npx -y ai-diagram-maker-mcp@latest", "config": { "mcpServers": { "ai-diagram-maker": { "headers": { "X-ADM-API-Key": "YOUR_API_KEY" }, "url": "https://mcp.aidiagrammaker.com/mcp" } } } }, "letme": { "capability": "https://letme.dev/diagram.create", "tool": "https://letme.dev/ai-diagram-maker-mcp" }, "area": "design-diagrams", "unitPrices": [ { "item": "Plus plan", "unit": "month", "usd": 10, "note": "250 AI credits a month; $96 billed yearly" }, { "item": "Max plan", "unit": "month", "usd": 20, "note": "500 AI credits a month; $192 billed yearly" } ], "provenance": { "legalEntity": "", "domain": "aidiagrammaker.com", "domainRegistered": "2025-08-21", "endpointOnVendorDomain": true, "terms": "https://www.aidiagrammaker.com/terms", "privacy": "https://www.aidiagrammaker.com/privacy", "statusPage": "", "changelog": "", "securityTxt": "none", "checked": "2026-11-06", "notes": [ "The terms and privacy policy, both last updated 24 September 2025, name the company only as AI Diagram Maker, under United States law, with aidiagrammaker@gmail.com as the contact. The npm package names Rajasekar Elango as author.", "The terms list scraping among prohibited uses. Public pages were read as data.", "www.aidiagrammaker.com/robots.txt allows all paths.", "RDAP gives aidiagrammaker.com a registration date of 21 August 2025.", "/.well-known/security.txt returns 404. No status page or changelog found; the GitHub releases are the only dated record." ], "score": 42 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/ai-diagram-maker-mcp.json", "live": { "slug": "ai-diagram-maker-mcp", "probe": { "target": "https://mcp.aidiagrammaker.com/mcp", "method": "mcp-initialize", "lastAt": "2026-11-07T18:20:09.018580127Z", "lastOk": false, "lastStatus": 0, "lastMs": 0, "lastNote": "TLS certificate problem", "authRequired": false, "uptime24h": 0, "uptime30d": 0, "p50ms24h": 0, "p95ms24h": 0, "samples24h": 200, "samples30d": 200, "days": [ { "date": "2026-11-06", "probes": 13, "ok": 0 }, { "date": "2026-11-07", "probes": 187, "ok": 0 } ], "outages": [ { "start": "2026-11-06T22:45:03.399368446Z", "end": "0001-01-01T00:00:00Z", "note": "TLS certificate problem" } ] }, "versions": [ { "registry": "mcp-registry", "name": "io.github.erajasekar/ai-diagram-maker-mcp", "version": "1.0.0", "seenAt": "2026-11-07T18:16:28.95801333Z" }, { "registry": "npm", "name": "ai-diagram-maker-mcp", "version": "3.0.8", "seenAt": "2026-11-06T23:04:20.113009064Z" } ], "githubStars": 10, "npmWeekly": 63, "securityTxt": { "url": "https://aidiagrammaker.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T16:00:48.542497373Z" }, "pages": [ { "url": "https://www.aidiagrammaker.com/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-11-07T14:24:25.783359417Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "40a879ba4963" }, { "url": "https://www.aidiagrammaker.com/terms", "kind": "terms", "status": 200, "checkedAt": "2026-11-07T14:24:27.95923952Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "9b4e6f213ed0" } ], "mcpTools": { "url": "https://mcp.aidiagrammaker.com/mcp", "checkedAt": "2026-11-07T01:42:20.967941233Z", "status": "error", "note": "Post \"https://mcp.aidiagrammaker.com/mcp\": tls: failed to verify certificate: x509: certificate is valid for *.up.railway.app, up.railway.app, not mcp.aidiagrammaker.com", "changedAt": "2026-11-07T01:42:20.967941233Z" }, "updatedAt": "2026-11-07T18:20:09.018580127Z" } }, "answer": "Whimsical MCP scores 50.4 (D) on agent readiness against AI Diagram Maker MCP's 43.8 (E), and leads in 5 of 7 scored categories. AI Diagram Maker MCP leads on schema \u0026 documentation and agent ergonomics.", "b": { "slug": "whimsical", "name": "Whimsical MCP", "vendor": "Whimsical", "vendorUrl": "https://whimsical.com", "kind": "mcp", "category": "diagramming", "summary": "Official hosted MCP server for the Whimsical workspace.", "url": "https://www.anchorterminal.com/tools/whimsical", "markdownUrl": "https://www.anchorterminal.com/tools/whimsical.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/whimsical.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/whimsical.json", "dns": "whimsical.grade.anchorterminal.com", "repo": "https://github.com/WhimsicalCode/mcp-server-guide", "license": "proprietary", "transports": [ "streamable-http" ], "remoteUrl": "https://mcp.whimsical.com/mcp", "packages": [], "auth": "oauth", "authNotes": "OAuth 2.1 with PKCE, scopes profile, mcp:read and mcp:write. No API keys. The beta REST API also uses OAuth, with client secrets issued by support to approved workspaces.", "pricing": "freemium", "pricingNotes": "Free $0 with 50 board objects and 50 doc blocks a month, 10 AI credits a member and watermarked exports. Pro $10 an editor a month and Business $20 billed yearly, 17 per cent less than monthly billing. Pro removes the object limit. Every MCP tool works on Free, within those limits (https://whimsical.com/pricing).", "priceSummary": "$10 / seat-mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402 support in docs or pricing (checked 2026-09-30).", "endpoints": [] }, "toolCount": 14, "popularity": { "githubStars": 5, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://whimsical.com/learn/integrations/mcp", "registryName": "com.whimsical/mcp", "capabilities": [ "diagram.create", "diagram.edit", "diagram.export" ], "tags": [ "hosted", "freemium", "free-tier", "mcp", "closed-source" ], "lastRelease": "2026-09-08", "graded": true, "anchor": { "graded": true, "score": 50.4, "grade": "D", "agentReady": false, "rank": 1053, "ranked": true, "rankOf": 1486, "categoryRank": 11, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 46, "maintenance": 31, "payments": 25, "reliability": 60, "schema": 54, "security": 58, "transparency": 71 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-04" }, "negative": 0, "verdict": "OAuth 2.1 with PKCE and separate read and write scopes. No API keys, so it can't run headless or in CI.", "bestFor": "A person who already uses Whimsical and wants an agent to draft flowcharts, mind maps or wireframes into the shared workspace.", "strengths": [ "OAuth 2.1 with PKCE and separate read and write scopes", "Flowcharts, mind maps, sequence diagrams, wireframes, sticky notes and docs, with automatic layout", "Status page showed no incident from 6 March to 1 October 2026", "SOC 2 Type II, a DPA and a published subprocessor list", "Whimsical's public repository carries the registry manifest and plugin manifests, tagged v1.1.0 on 8 September 2026" ], "weaknesses": [ "No API keys, so it can't run headless or in CI", "Rate limits and error responses aren't documented", "REST API is a closed, read-only beta", "Free plan caps creation at 50 board objects a month", "Export is PNG snapshots only. No SVG, draw.io or diagram code out" ], "agentNotes": [ "Use `add_board_content` for flowcharts, mind maps, sequence diagrams and wireframes, and `auto_layout` to change direction, rather than placing shapes one by one with `edit`", "Call `how_to` for Whimsical's syntax before writing a large flowchart or wireframe", "Use `fetch` when you need a PNG snapshot of a board", "`delete` moves files to the trash, and `edit` and `comment_edit` can delete content, without asking. Confirm with the person first", "On a 401 or \"Missing Bearer token\" answer, ask the person to sign in again through the client's reconnect action" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "D", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 50.4 } ], "editorialScores": { "ergonomics": 46, "maintenance": 31, "payments": 25, "reliability": 60, "schema": 54, "security": 58, "transparency": 53 }, "provenanceScore": 89, "checked": { "categories": { "ergonomics": "2026-11-04", "maintenance": "2026-11-04", "payments": "2026-11-04", "reliability": "2026-11-04", "schema": "2026-11-04", "security": "2026-11-04", "transparency": "2026-11-04" }, "last": "2026-11-04", "lastMoved": "2026-11-04", "oldest": "2026-11-04", "stale": false, "staleAfterDays": 90 } }, "connect": { "claudeCode": "claude mcp add --transport http whimsical https://mcp.whimsical.com/mcp", "config": { "mcpServers": { "whimsical": { "url": "https://mcp.whimsical.com/mcp" } } } }, "letme": { "capability": "https://letme.dev/diagram.create", "tool": "https://letme.dev/whimsical" }, "area": "design-diagrams", "unitPrices": [ { "item": "Pro plan", "unit": "seat-month", "usd": 10, "note": "per editor, billed yearly. Removes the Free object limit" }, { "item": "Business plan", "unit": "seat-month", "usd": 20, "note": "per editor, billed yearly. Adds SAML SSO and SCIM" } ], "provenance": { "legalEntity": "Whimsical, Inc.", "domain": "whimsical.com", "domainRegistered": "1998-09-26", "domainNote": "whimsical.com was registered in 1998, long before the product launched.", "endpointOnVendorDomain": true, "terms": "https://whimsical.com/terms", "privacy": "https://whimsical.com/terms/privacy", "statusPage": "https://status.whimsical.com", "changelog": "https://whimsical.com/changelog", "securityTxt": "none", "checked": "2026-11-04", "notes": [ "Address in the privacy policy is 1630 Welton Street, 7th Floor, Denver, Colorado 80202, USA", "The status page runs on Sorry and showed the last incident on 6 March 2026 at the 1 October check", "The MIT-licensed GitHub repo holds a setup guide and registry and plugin manifests, not the server", "The terms, last updated 30 July 2025, bar any robot, spider or other automatic means of access to the Services, so whimsical.com pages and the status page were not re-read on 2026-11-04", "security.txt not re-read on 2026-11-04; none per the 30 September check" ], "score": 89 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/whimsical.json", "live": { "slug": "whimsical", "probe": { "target": "https://mcp.whimsical.com/mcp", "method": "mcp-initialize", "lastAt": "2026-11-07T18:21:05.453527763Z", "lastOk": true, "lastStatus": 401, "lastMs": 136, "lastNote": "asks for credentials", "authRequired": true, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 141, "p95ms24h": 323, "samples24h": 239, "samples30d": 7910, "days": [ { "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": 247, "ok": 247 }, { "date": "2026-10-11", "probes": 247, "ok": 247 }, { "date": "2026-10-12", "probes": 247, "ok": 247 }, { "date": "2026-10-13", "probes": 248, "ok": 248 }, { "date": "2026-10-14", "probes": 249, "ok": 249 }, { "date": "2026-10-15", "probes": 253, "ok": 253 }, { "date": "2026-10-16", "probes": 252, "ok": 252 }, { "date": "2026-10-17", "probes": 253, "ok": 253 }, { "date": "2026-10-18", "probes": 256, "ok": 256 }, { "date": "2026-10-19", "probes": 255, "ok": 255 }, { "date": "2026-10-20", "probes": 252, "ok": 252 }, { "date": "2026-10-21", "probes": 253, "ok": 253 }, { "date": "2026-10-22", "probes": 253, "ok": 253 }, { "date": "2026-10-23", "probes": 248, "ok": 248 }, { "date": "2026-10-24", "probes": 251, "ok": 251 }, { "date": "2026-10-25", "probes": 250, "ok": 250 }, { "date": "2026-10-26", "probes": 252, "ok": 252 }, { "date": "2026-10-27", "probes": 249, "ok": 249 }, { "date": "2026-10-28", "probes": 250, "ok": 250 }, { "date": "2026-10-29", "probes": 249, "ok": 249 }, { "date": "2026-10-30", "probes": 249, "ok": 249 }, { "date": "2026-10-31", "probes": 251, "ok": 251 }, { "date": "2026-11-01", "probes": 249, "ok": 249 }, { "date": "2026-11-02", "probes": 250, "ok": 250 }, { "date": "2026-11-03", "probes": 248, "ok": 248 }, { "date": "2026-11-04", "probes": 246, "ok": 246 }, { "date": "2026-11-05", "probes": 185, "ok": 185 }, { "date": "2026-11-06", "probes": 241, "ok": 241 }, { "date": "2026-11-07", "probes": 187, "ok": 187 } ] }, "vendorStatus": { "page": "https://status.whimsical.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-11-07T04:48:59.822934867Z" }, "versions": [ { "registry": "mcp-registry", "name": "com.whimsical/mcp", "version": "1.1.0", "seenAt": "2026-11-07T18:16:28.95801333Z" } ], "githubStars": 11, "securityTxt": { "url": "https://whimsical.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T16:01:07.413085305Z" }, "domain": { "domain": "whimsical.com", "registered": "1998-09-26", "source": "https://rdap.verisign.com/com/v1/domain/whimsical.com", "checkedAt": "2026-11-01T14:21:45.075691457Z" }, "pages": [ { "url": "https://whimsical.com/changelog", "kind": "changelog", "status": 200, "checkedAt": "2026-11-07T14:23:50.989494926Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "e3b0c44298fc" }, { "url": "https://whimsical.com/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-11-07T14:23:53.191947319Z", "changedAt": "2026-11-05T13:08:10.310596264Z", "fingerprint": "e99866c05d75" }, { "url": "https://whimsical.com/terms/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-11-07T14:23:57.316574218Z", "changedAt": "2026-11-05T13:08:13.989794474Z", "fingerprint": "47d5b9f16278" }, { "url": "https://whimsical.com/terms", "kind": "terms", "status": 200, "checkedAt": "2026-11-07T14:23:55.343075768Z", "changedAt": "2026-11-05T13:08:11.400209097Z", "fingerprint": "51520f326147" } ], "mcpTools": { "url": "https://mcp.whimsical.com/mcp", "checkedAt": "2026-11-07T01:49:13.342745174Z", "status": "auth", "note": "asks for credentials before listing its tools", "changedAt": "2026-09-30T21:57:09.851244047Z" }, "github": { "repo": "whimsicalcode/mcp-server-guide", "checkedAt": "2026-11-02T09:38:20.50771477Z", "stars": 11, "archived": false, "issuesEnabled": true, "pushedAt": "2026-10-14T13:26:01Z", "openIssues": 0, "openPRs": 0, "issuesOpened90d": 0, "issuesClosed90d": 0, "prsMerged90d": 3 }, "updatedAt": "2026-11-07T18:21:05.453527763Z" } }, "edges": [ { "by": 36, "category": "transparency", "leads": "whimsical", "name": "Transparency \u0026 trust", "reasons": { "a": "The MCP server is MIT (package.json and LICENSE, added 18 March 2026). The service is closed, under terms last updated 24 September 2025 that name the operator only as AI Diagram Maker (20 of 30). The privacy policy of the same date keeps diagrams, revisions and chat prompts and responses 'as long as necessary', and the terms license user input 'to provide and improve our services', with no retention periods and no word on model training or the AI providers used (8 of 30). No deprecation policy or dated notices (0). No subprocessors or data locations named (0). The MCP server's source sends no telemetry of its own. 20 + 8 + 0 + 0 = 28.", "b": "The server is closed with published terms, last updated 30 July 2025. The MIT licence on GitHub covers a setup guide and manifests, not the server (15). Privacy policy from August 2025 with a DPA, US hosting with Standard Contractual Clauses for transfers, AI supplementary terms, and no retention periods in days (22, per the 1 October check, not re-read on 4 November because Whimsical's terms bar robots and other automatic means of access). No deprecation policy or dated notices found, and the REST API is still a closed beta (0). A separate subprocessor list, and hosting in the US named (16). 15 + 22 + 0 + 16 = 53." }, "scores": { "a": 35, "b": 71 } }, { "by": 30, "category": "reliability", "leads": "whimsical", "name": "Reliability", "reasons": { "a": "Hosted lines, because every tool call is generated on the AI Diagram Maker service, through the hosted endpoint or the npx server. No status page found on the site or in the README (0). No readable incident history (5). The only rate-limit number is the example in the OpenAPI 429 schema ('Maximum 100 requests per day exceeded.'), which isn't stated as the limit (5 of 15). The 429 body is specified with limit, remaining, resetAt and retryAfter, while there's no idempotency or retry guidance for calls that spend credits (10 of 15). No SLA found (0). Nothing labels the service or server beta (10). 0 + 5 + 5 + 10 + 0 + 10 = 30.", "b": "Status page at status.whimsical.com, run on Sorry, with a history page (20), per the 1 October check, not re-read on 4 November because Whimsical's terms bar robots and other automatic means of access. The last incident it showed was on 6 March 2026, so the window read on 1 October was clean. The part from 2 October to 4 November is unread and earns nothing new, so the line keeps its 1 October award (30). Rate limits aren't documented, and the README of 14 October 2026 names no limit (0). No 429 or retry guidance. The README's troubleshooting covers only 401 and expired sessions (0). No SLA found (0). The remote MCP server is generally available, tagged v1.1.0 in Whimsical's repository (10). 20 + 30 + 0 + 0 + 0 + 10 = 60." }, "scores": { "a": 30, "b": 60 } }, { "by": 21, "category": "schema", "leads": "ai-diagram-maker-mcp", "name": "Schema \u0026 documentation", "reasons": { "a": "All five tools have zod input schemas in src/tools, and the repository ships an OpenAPI 3 file for POST /api/v2/diagrams/generate (25). No llms.txt (404) and no docs site for agents beyond the README (0). Each description says what the tool does and when to use it, listing trigger phrases and the diagram types, without saying when another tool fits better (16 of 20). `content` has a minimum length and `diagramType` an eight-value enum; the OpenAPI adds `inputType` and `format` enums (13 of 15). Examples in the parameter descriptions and README, and the OpenAPI documents 400, 401, 402, 422 (D2 failed to compile) and 429 with typed error bodies (13 of 15). Git tags from v1.1.1 to v3.0.8 and a /api/v2 path, with no changelog or release notes (8 of 15). 25 + 0 + 16 + 13 + 13 + 8 = 75.", "b": "The server is closed, so we couldn't read the tool schemas. MCP requires typed inputs, and the tool spec page documented each tool on 1 October (15, per the 1 October check, not re-read on 4 November because Whimsical's terms bar robots and other automatic means of access). No llms.txt. The `how_to` tool hands the agent Whimsical's syntax docs on demand (5). Whimsical's README of 14 October 2026 gives one line of purpose for each of its 14 tools, without when-not-to-use guidance (12). Input constraints unread (7). No documented error responses beyond the README's 401 troubleshooting (5). Versioning through the registry manifest (server.json 1.0.0 from 26 March 2026, 1.1.0 tagged v1.1.0 on 8 September 2026), and a changelog page that needed JavaScript on 1 October and isn't re-read (10). 15 + 5 + 12 + 7 + 5 + 10 = 54." }, "scores": { "a": 75, "b": 54 } }, { "by": 20, "category": "ergonomics", "leads": "ai-diagram-maker-mcp", "name": "Agent ergonomics", "reasons": { "a": "Five compact tools (25). Output can be SVG or PNG and the API can return the D2 source with `debug`, but there's nothing to page or trim, and results carry the rendered image (10 of 20). Typed error bodies with codes, a 422 that returns the failing D2 code, and retryAfter on 429 (16 of 20). No readOnlyHint or other annotations in the source and no idempotency key, and every call spends credits (5 of 20). Only `content` is required and the hosted endpoint needs no install, but there is no SDK beyond the server (10 of 15). 25 + 10 + 16 + 5 + 10 = 66.", "b": "14 tools in the README's tool table of 14 October 2026 (11 to 30, 15), with syntax docs loaded on demand through `how_to` (3 back, 18). `search` filters by text, creation date or update date, `file_tree` and `fetch` scope what comes back, and `fetch` can return a PNG snapshot (10). Error responses aren't documented (5). Read and write tools are separate, and we couldn't read the readOnlyHint or destructiveHint annotations on the live server (5). `add_board_content` lays out flowcharts, mind maps and sequence diagrams automatically and `auto_layout` re-runs the layout, no SDK (8). 18 + 10 + 5 + 5 + 8 = 46." }, "scores": { "a": 66, "b": 46 } }, { "by": 14, "category": "maintenance", "leads": "whimsical", "name": "Maintenance \u0026 community", "reasons": { "a": "Last release v3.0.8, published to npm on 10 April 2026, 210 days before this check (0). No release since 8 August (0). Four issues in all. The two open ones, from 4 May (hosted MCP credit usage) and 13 October 2026, show no reply, and one closed issue had a comment (5 of 25). In the official MCP registry under the GitHub-verified namespace io.github.erajasekar, but the entry is 1.0.0 from 19 March 2026 while npm is on 3.0.8 (10 of 15). The only workflow publishes to the registry. No tests or CI, and the MCP SDK floor is ^1.9.0 (2 of 10). 0 + 0 + 5 + 10 + 2 = 17.", "b": "The newest dated release is the repository's v1.1.0 tag (server.json and plugin manifests 1.1.0) of 8 September 2026, 57 days before 4 November (20). The commits of 14 October rewrite the README, add screenshots and glama.json and change a contact email, with no version, so they don't count. One dated release since 6 August, and the registry's 13 August date for 1.0.0 came from its JSON API and is struck, so the 90-day line stays 0. The changelog page wasn't re-read (terms ban). Support by email, not tested (8). The README says the server is listed in the official MCP Registry as `com.whimsical/mcp`, and its server.json names that entry, but that is Whimsical's own claim. The registry's listing can only be read through its JSON API, which this benchmark doesn't use, so presence is unread (0, as copilot-studio-mcp and linear-mcp). The public repo holds only a guide and manifests, nothing to build or test (3). 20 + 0 + 8 + 0 + 3 = 31." }, "scores": { "a": 17, "b": 31 } }, { "by": 13, "category": "security", "leads": "whimsical", "name": "Security \u0026 auth", "reasons": { "a": "Several named API keys per account, shown once and deactivated or deleted in Settings with a confirmation step, sent in a header, never a query string. No scopes, and the user guide says anyone with a key can access the account (20 of 30). The tools only create diagrams and can't change or delete anything in the account, but there's no read-only key (12 of 20). Tools return diagrams built from the caller's own input. Image inputs can be any public URL (10 of 15). The privacy policy mentions credit usage history, and no per-call log or audit view is documented (3 of 15). No security.txt, disclosure policy, bug bounty or certification found (0). 20 + 12 + 10 + 3 + 0 = 45.", "b": "OAuth 2.1 with PKCE and no API keys, restated in the README of 14 October 2026. Separate read and write scopes per the 30 September check (28). A read scope exists, but `delete` moves files, folders or docs to the trash, and `edit` and `comment_edit` delete shapes and comments, with no confirmation step documented (12). `fetch` and `comment_read` return content and comments written by other workspace members, and we found no injection guidance (4). No audit log for MCP calls found (0). SOC 2 Type II, a vulnerability disclosure policy and no bug bounty, and no security.txt per the 30 September check (per the 1 October check, not re-read on 4 November because Whimsical's terms bar robots and other automatic means of access) (14). 28 + 12 + 4 + 0 + 14 = 58." }, "scores": { "a": 45, "b": 58 } } ], "facts": [ { "a": "MCP server", "b": "MCP server", "name": "Kind" }, { "a": "AI Diagram Maker (Rajasekar Elango)", "b": "Whimsical", "name": "Vendor" }, { "a": "https://mcp.aidiagrammaker.com/mcp", "b": "https://mcp.whimsical.com/mcp", "name": "Hosted endpoint" }, { "a": "Streamable HTTP, stdio", "b": "Streamable HTTP", "name": "Transports" }, { "a": "API key", "b": "OAuth", "name": "Auth" }, { "a": "Freemium", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "MIT for the MCP server. The AI Diagram Maker service it calls is closed, under terms last updated 24 September 2025", "b": "proprietary", "name": "Licence" }, { "a": "5", "b": "14", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "no", "b": "no", "name": "llms.txt" }, { "a": "io.github.erajasekar/ai-diagram-maker-mcp", "b": "com.whimsical/mcp", "name": "MCP registry" }, { "a": "2026-04-10", "b": "2026-09-08", "name": "Last release" }, { "a": "2025-09-24", "b": "2025-07-30", "name": "Terms last updated" }, { "a": "2025-09-24", "b": "2025-08-01", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "yes", "b": "yes", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "not found in the text", "b": "yes", "name": "Arbitration or class-action waiver" }, { "a": "63 npm/wk", "b": "5 stars", "name": "Popularity" }, { "a": "none", "b": "3/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Whimsical MCP scores 50.4 (D) on agent readiness against AI Diagram Maker MCP's 43.8 (E), and leads in 5 of 7 scored categories. AI Diagram Maker MCP leads on schema \u0026 documentation and agent ergonomics.", "question": "Which is better for AI agents, AI Diagram Maker MCP or Whimsical MCP?" }, { "answer": "AI Diagram Maker MCP needs an API key. Whimsical MCP uses an OAuth sign-in.", "question": "Do AI Diagram Maker MCP and Whimsical MCP need an API key?" }, { "answer": "Yes. AI Diagram Maker MCP has a hosted endpoint at https://mcp.aidiagrammaker.com/mcp and Whimsical MCP at https://mcp.whimsical.com/mcp.", "question": "Can an agent call AI Diagram Maker MCP and Whimsical MCP without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Schema \u0026 documentation, 75 against 54", "Agent ergonomics, 66 against 46" ], "also": [ "Runs on your own machine" ], "goodFor": "Quick architecture, sequence, ERD and flowchart diagrams from a coding agent, with a link to edit them.", "slug": "ai-diagram-maker-mcp", "watchFor": "Last release 3.0.8 on 10 April 2026, and the registry entry still says 1.0.0" }, { "aheadOn": [ "Reliability, 60 against 30", "Security \u0026 auth, 58 against 45", "Payments \u0026 pricing, 25 against 20", "Maintenance \u0026 community, 31 against 17", "Transparency \u0026 trust, 71 against 35" ], "also": null, "goodFor": "A person who already uses Whimsical and wants an agent to draft flowcharts, mind maps or wireframes into the shared workspace.", "slug": "whimsical", "watchFor": "No API keys, so it can't run headless or in CI" } ], "history": { "ai-diagram-maker-mcp": null, "whimsical": [ { "causes": [ "correction" ], "date": "2026-11-04", "delta": -2.2, "from": 52.6, "fromGrade": "D", "to": 50.4, "toGrade": "D" }, { "causes": [ "method" ], "date": "2026-10-27", "delta": 0, "from": 52.6, "fromGrade": "D", "to": 52.6, "toGrade": "D" }, { "causes": [ "method" ], "date": "2026-10-08", "delta": -0.1, "from": 52.7, "fromGrade": "D", "to": 52.6, "toGrade": "D" } ] }, "job": { "capability": "diagram.create", "name": "Diagram creation" }, "others": [ { "json": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-cloudviz.json", "title": "AI Diagram Maker MCP vs Cloudviz API", "url": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-cloudviz" }, { "json": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-d2.json", "title": "AI Diagram Maker MCP vs D2", "url": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-d2" }, { "json": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-diagrams-so.json", "title": "AI Diagram Maker MCP vs Diagrams.so API + MCP", "url": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-diagrams-so" }, { "json": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-drawio.json", "title": "AI Diagram Maker MCP vs draw.io + MCP", "url": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-drawio" }, { "json": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-eraser.json", "title": "AI Diagram Maker MCP vs Eraser API + MCP", "url": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-eraser" }, { "json": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-excaliclaw.json", "title": "AI Diagram Maker MCP vs ExcaliClaw", "url": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-excaliclaw" }, { "json": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-excalidraw.json", "title": "AI Diagram Maker MCP vs Excalidraw", "url": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-excalidraw" }, { "json": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-kroki.json", "title": "AI Diagram Maker MCP vs Kroki", "url": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-kroki" }, { "json": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-lucid.json", "title": "AI Diagram Maker MCP vs Lucid API + MCP", "url": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-lucid" }, { "json": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-mermaid-chart.json", "title": "AI Diagram Maker MCP vs Mermaid Chart MCP", "url": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-mermaid-chart" }, { "json": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-mumble.json", "title": "AI Diagram Maker MCP vs Mumble", "url": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-mumble" }, { "json": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-mural-mcp.json", "title": "AI Diagram Maker MCP vs Mural MCP", "url": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-mural-mcp" }, { "json": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-plantuml.json", "title": "AI Diagram Maker MCP vs PlantUML", "url": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-plantuml" }, { "json": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-structurizr.json", "title": "AI Diagram Maker MCP vs Structurizr + MCP", "url": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-structurizr" }, { "json": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-tldraw.json", "title": "AI Diagram Maker MCP vs tldraw SDK + MCP", "url": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-tldraw" }, { "json": "https://www.anchorterminal.com/compare/cloudviz-vs-whimsical.json", "title": "Cloudviz API vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/cloudviz-vs-whimsical" }, { "json": "https://www.anchorterminal.com/compare/d2-vs-whimsical.json", "title": "D2 vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/d2-vs-whimsical" }, { "json": "https://www.anchorterminal.com/compare/diagrams-so-vs-whimsical.json", "title": "Diagrams.so API + MCP vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/diagrams-so-vs-whimsical" }, { "json": "https://www.anchorterminal.com/compare/drawio-vs-whimsical.json", "title": "draw.io + MCP vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/drawio-vs-whimsical" }, { "json": "https://www.anchorterminal.com/compare/eraser-vs-whimsical.json", "title": "Eraser API + MCP vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/eraser-vs-whimsical" }, { "json": "https://www.anchorterminal.com/compare/excaliclaw-vs-whimsical.json", "title": "ExcaliClaw vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/excaliclaw-vs-whimsical" }, { "json": "https://www.anchorterminal.com/compare/excalidraw-vs-whimsical.json", "title": "Excalidraw vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/excalidraw-vs-whimsical" }, { "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-whimsical.json", "title": "Lucid API + MCP vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/lucid-vs-whimsical" }, { "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/mumble-vs-whimsical.json", "title": "Mumble vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/mumble-vs-whimsical" }, { "json": "https://www.anchorterminal.com/compare/mural-mcp-vs-whimsical.json", "title": "Mural MCP vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/mural-mcp-vs-whimsical" }, { "json": "https://www.anchorterminal.com/compare/plantuml-vs-whimsical.json", "title": "PlantUML vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/plantuml-vs-whimsical" }, { "json": "https://www.anchorterminal.com/compare/structurizr-vs-whimsical.json", "title": "Structurizr + MCP vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/structurizr-vs-whimsical" }, { "json": "https://www.anchorterminal.com/compare/tldraw-vs-whimsical.json", "title": "tldraw SDK + MCP vs Whimsical MCP", "url": "https://www.anchorterminal.com/compare/tldraw-vs-whimsical" } ], "panel": null, "scores": [ { "ai-diagram-maker-mcp": 30, "by": 30, "edge": "whimsical", "key": "reliability", "name": "Reliability", "weight": 16, "whimsical": 60 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "ai-diagram-maker-mcp": 75, "by": 21, "edge": "ai-diagram-maker-mcp", "key": "schema", "name": "Schema \u0026 documentation", "weight": 13, "whimsical": 54 }, { "ai-diagram-maker-mcp": 66, "by": 20, "edge": "ai-diagram-maker-mcp", "key": "ergonomics", "name": "Agent ergonomics", "weight": 13, "whimsical": 46 }, { "ai-diagram-maker-mcp": 45, "by": 13, "edge": "whimsical", "key": "security", "name": "Security \u0026 auth", "weight": 14, "whimsical": 58 }, { "ai-diagram-maker-mcp": 20, "by": 5, "edge": "whimsical", "key": "payments", "name": "Payments \u0026 pricing", "weight": 10, "whimsical": 25 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "ai-diagram-maker-mcp": 17, "by": 14, "edge": "whimsical", "key": "maintenance", "name": "Maintenance \u0026 community", "weight": 7, "whimsical": 31 }, { "ai-diagram-maker-mcp": 35, "by": 36, "edge": "whimsical", "key": "transparency", "name": "Transparency \u0026 trust", "weight": 7, "whimsical": 71 } ], "summary": "Whimsical MCP scores 50.4 (D) on agent readiness against AI Diagram Maker MCP's 43.8 (E), and leads in 5 of 7 scored categories. AI Diagram Maker MCP leads on schema \u0026 documentation and agent ergonomics. Both do diagram creation.", "tasks": null, "tutorials": [], "verdicts": { "ai-diagram-maker-mcp": "Five compact, typed tools turn text, JSON, ASCII art, images or Mermaid into an editable D2 diagram, and the API documents its error and rate-limit responses. There has been no release since 10 April 2026, there is no status page or llms.txt, and the API key opens the whole account with no scopes.", "whimsical": "OAuth 2.1 with PKCE and separate read and write scopes. No API keys, so it can't run headless or in CI." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-whimsical", "json": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-whimsical.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-whimsical.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-whimsical.min.md" }, "markdown": "Whimsical MCP scores 50.4 (D) on agent readiness against AI Diagram Maker MCP's 43.8 (E), and leads in 5 of 7 scored categories. AI Diagram Maker MCP leads on schema \u0026 documentation and agent ergonomics. Both do diagram creation.\n\n- AI Diagram Maker MCP: grade E, 43.8/100, rank #1225 of 1486. Markdown https://www.anchorterminal.com/tools/ai-diagram-maker-mcp.md · JSON https://www.anchorterminal.com/api/v1/tools/ai-diagram-maker-mcp.json\n- Whimsical MCP: grade D, 50.4/100, rank #1053 of 1486. Markdown https://www.anchorterminal.com/tools/whimsical.md · JSON https://www.anchorterminal.com/api/v1/tools/whimsical.json\n- Best diagramming APIs and diagram-as-code for AI agents: https://www.anchorterminal.com/best/diagramming/index.md\n- All 147 diagrams comparisons: https://www.anchorterminal.com/compare/diagramming/index.md\n\n## Which one, for what\n\n### AI Diagram Maker MCP (E)\n\nGood for: Quick architecture, sequence, ERD and flowchart diagrams from a coding agent, with a link to edit them.\n\nAhead on:\n- Schema \u0026 documentation, 75 against 54\n- Agent ergonomics, 66 against 46\n\nAlso in its favour:\n- Runs on your own machine\n\nWatch for: Last release 3.0.8 on 10 April 2026, and the registry entry still says 1.0.0\n\n### Whimsical MCP (D)\n\nGood for: A person who already uses Whimsical and wants an agent to draft flowcharts, mind maps or wireframes into the shared workspace.\n\nAhead on:\n- Reliability, 60 against 30\n- Security \u0026 auth, 58 against 45\n- Payments \u0026 pricing, 25 against 20\n- Maintenance \u0026 community, 31 against 17\n- Transparency \u0026 trust, 71 against 35\n\nWatch for: No API keys, so it can't run headless or in CI\n\n\n## Why the edge\n\n### Transparency \u0026 trust: Whimsical MCP +36\n\n- AI Diagram Maker MCP (35): The MCP server is MIT (package.json and LICENSE, added 18 March 2026). The service is closed, under terms last updated 24 September 2025 that name the operator only as AI Diagram Maker (20 of 30). The privacy policy of the same date keeps diagrams, revisions and chat prompts and responses 'as long as necessary', and the terms license user input 'to provide and improve our services', with no retention periods and no word on model training or the AI providers used (8 of 30). No deprecation policy or dated notices (0). No subprocessors or data locations named (0). The MCP server's source sends no telemetry of its own. 20 + 8 + 0 + 0 = 28.\n- Whimsical MCP (71): The server is closed with published terms, last updated 30 July 2025. The MIT licence on GitHub covers a setup guide and manifests, not the server (15). Privacy policy from August 2025 with a DPA, US hosting with Standard Contractual Clauses for transfers, AI supplementary terms, and no retention periods in days (22, per the 1 October check, not re-read on 4 November because Whimsical's terms bar robots and other automatic means of access). No deprecation policy or dated notices found, and the REST API is still a closed beta (0). A separate subprocessor list, and hosting in the US named (16). 15 + 22 + 0 + 16 = 53.\n\n### Reliability: Whimsical MCP +30\n\n- AI Diagram Maker MCP (30): Hosted lines, because every tool call is generated on the AI Diagram Maker service, through the hosted endpoint or the npx server. No status page found on the site or in the README (0). No readable incident history (5). The only rate-limit number is the example in the OpenAPI 429 schema ('Maximum 100 requests per day exceeded.'), which isn't stated as the limit (5 of 15). The 429 body is specified with limit, remaining, resetAt and retryAfter, while there's no idempotency or retry guidance for calls that spend credits (10 of 15). No SLA found (0). Nothing labels the service or server beta (10). 0 + 5 + 5 + 10 + 0 + 10 = 30.\n- Whimsical MCP (60): Status page at status.whimsical.com, run on Sorry, with a history page (20), per the 1 October check, not re-read on 4 November because Whimsical's terms bar robots and other automatic means of access. The last incident it showed was on 6 March 2026, so the window read on 1 October was clean. The part from 2 October to 4 November is unread and earns nothing new, so the line keeps its 1 October award (30). Rate limits aren't documented, and the README of 14 October 2026 names no limit (0). No 429 or retry guidance. The README's troubleshooting covers only 401 and expired sessions (0). No SLA found (0). The remote MCP server is generally available, tagged v1.1.0 in Whimsical's repository (10). 20 + 30 + 0 + 0 + 0 + 10 = 60.\n\n### Schema \u0026 documentation: AI Diagram Maker MCP +21\n\n- AI Diagram Maker MCP (75): All five tools have zod input schemas in src/tools, and the repository ships an OpenAPI 3 file for POST /api/v2/diagrams/generate (25). No llms.txt (404) and no docs site for agents beyond the README (0). Each description says what the tool does and when to use it, listing trigger phrases and the diagram types, without saying when another tool fits better (16 of 20). `content` has a minimum length and `diagramType` an eight-value enum; the OpenAPI adds `inputType` and `format` enums (13 of 15). Examples in the parameter descriptions and README, and the OpenAPI documents 400, 401, 402, 422 (D2 failed to compile) and 429 with typed error bodies (13 of 15). Git tags from v1.1.1 to v3.0.8 and a /api/v2 path, with no changelog or release notes (8 of 15). 25 + 0 + 16 + 13 + 13 + 8 = 75.\n- Whimsical MCP (54): The server is closed, so we couldn't read the tool schemas. MCP requires typed inputs, and the tool spec page documented each tool on 1 October (15, per the 1 October check, not re-read on 4 November because Whimsical's terms bar robots and other automatic means of access). No llms.txt. The `how_to` tool hands the agent Whimsical's syntax docs on demand (5). Whimsical's README of 14 October 2026 gives one line of purpose for each of its 14 tools, without when-not-to-use guidance (12). Input constraints unread (7). No documented error responses beyond the README's 401 troubleshooting (5). Versioning through the registry manifest (server.json 1.0.0 from 26 March 2026, 1.1.0 tagged v1.1.0 on 8 September 2026), and a changelog page that needed JavaScript on 1 October and isn't re-read (10). 15 + 5 + 12 + 7 + 5 + 10 = 54.\n\n### Agent ergonomics: AI Diagram Maker MCP +20\n\n- AI Diagram Maker MCP (66): Five compact tools (25). Output can be SVG or PNG and the API can return the D2 source with `debug`, but there's nothing to page or trim, and results carry the rendered image (10 of 20). Typed error bodies with codes, a 422 that returns the failing D2 code, and retryAfter on 429 (16 of 20). No readOnlyHint or other annotations in the source and no idempotency key, and every call spends credits (5 of 20). Only `content` is required and the hosted endpoint needs no install, but there is no SDK beyond the server (10 of 15). 25 + 10 + 16 + 5 + 10 = 66.\n- Whimsical MCP (46): 14 tools in the README's tool table of 14 October 2026 (11 to 30, 15), with syntax docs loaded on demand through `how_to` (3 back, 18). `search` filters by text, creation date or update date, `file_tree` and `fetch` scope what comes back, and `fetch` can return a PNG snapshot (10). Error responses aren't documented (5). Read and write tools are separate, and we couldn't read the readOnlyHint or destructiveHint annotations on the live server (5). `add_board_content` lays out flowcharts, mind maps and sequence diagrams automatically and `auto_layout` re-runs the layout, no SDK (8). 18 + 10 + 5 + 5 + 8 = 46.\n\n### Maintenance \u0026 community: Whimsical MCP +14\n\n- AI Diagram Maker MCP (17): Last release v3.0.8, published to npm on 10 April 2026, 210 days before this check (0). No release since 8 August (0). Four issues in all. The two open ones, from 4 May (hosted MCP credit usage) and 13 October 2026, show no reply, and one closed issue had a comment (5 of 25). In the official MCP registry under the GitHub-verified namespace io.github.erajasekar, but the entry is 1.0.0 from 19 March 2026 while npm is on 3.0.8 (10 of 15). The only workflow publishes to the registry. No tests or CI, and the MCP SDK floor is ^1.9.0 (2 of 10). 0 + 0 + 5 + 10 + 2 = 17.\n- Whimsical MCP (31): The newest dated release is the repository's v1.1.0 tag (server.json and plugin manifests 1.1.0) of 8 September 2026, 57 days before 4 November (20). The commits of 14 October rewrite the README, add screenshots and glama.json and change a contact email, with no version, so they don't count. One dated release since 6 August, and the registry's 13 August date for 1.0.0 came from its JSON API and is struck, so the 90-day line stays 0. The changelog page wasn't re-read (terms ban). Support by email, not tested (8). The README says the server is listed in the official MCP Registry as `com.whimsical/mcp`, and its server.json names that entry, but that is Whimsical's own claim. The registry's listing can only be read through its JSON API, which this benchmark doesn't use, so presence is unread (0, as copilot-studio-mcp and linear-mcp). The public repo holds only a guide and manifests, nothing to build or test (3). 20 + 0 + 8 + 0 + 3 = 31.\n\n### Security \u0026 auth: Whimsical MCP +13\n\n- AI Diagram Maker MCP (45): Several named API keys per account, shown once and deactivated or deleted in Settings with a confirmation step, sent in a header, never a query string. No scopes, and the user guide says anyone with a key can access the account (20 of 30). The tools only create diagrams and can't change or delete anything in the account, but there's no read-only key (12 of 20). Tools return diagrams built from the caller's own input. Image inputs can be any public URL (10 of 15). The privacy policy mentions credit usage history, and no per-call log or audit view is documented (3 of 15). No security.txt, disclosure policy, bug bounty or certification found (0). 20 + 12 + 10 + 3 + 0 = 45.\n- Whimsical MCP (58): OAuth 2.1 with PKCE and no API keys, restated in the README of 14 October 2026. Separate read and write scopes per the 30 September check (28). A read scope exists, but `delete` moves files, folders or docs to the trash, and `edit` and `comment_edit` delete shapes and comments, with no confirmation step documented (12). `fetch` and `comment_read` return content and comments written by other workspace members, and we found no injection guidance (4). No audit log for MCP calls found (0). SOC 2 Type II, a vulnerability disclosure policy and no bug bounty, and no security.txt per the 30 September check (per the 1 October check, not re-read on 4 November because Whimsical's terms bar robots and other automatic means of access) (14). 28 + 12 + 4 + 0 + 14 = 58.\n\n## Score by category\n\n| Category | Weight | AI Diagram Maker MCP | Whimsical MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 30 | 60 | Whimsical MCP +30 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 75 | 54 | AI Diagram Maker MCP +21 |\n| Agent ergonomics | 13% (16.2 this run) | 66 | 46 | AI Diagram Maker MCP +20 |\n| Security \u0026 auth | 14% (17.5 this run) | 45 | 58 | Whimsical MCP +13 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 20 | 25 | Whimsical MCP +5 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 17 | 31 | Whimsical MCP +14 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 35 | 71 | Whimsical MCP +36 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **43.8 · E** | **50.4 · D** | |\n\n## Facts side by side\n\n| Fact | AI Diagram Maker MCP | Whimsical MCP |\n| --- | --- | --- |\n| Kind | MCP server | MCP server |\n| Vendor | AI Diagram Maker (Rajasekar Elango) | Whimsical |\n| Hosted endpoint | `https://mcp.aidiagrammaker.com/mcp` | `https://mcp.whimsical.com/mcp` |\n| Transports | Streamable HTTP, stdio | Streamable HTTP |\n| Auth | API key | OAuth |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | MIT for the MCP server. The AI Diagram Maker service it calls is closed, under terms last updated 24 September 2025 | proprietary |\n| Tools exposed | 5 | 14 |\n| Read-only variant documented | no | no |\n| llms.txt | no | no |\n| MCP registry | `io.github.erajasekar/ai-diagram-maker-mcp` | `com.whimsical/mcp` |\n| Last release | 2026-04-10 | 2026-09-08 |\n| Terms last updated | 2025-09-24 | 2025-07-30 |\n| Privacy policy last updated | 2025-09-24 | 2025-08-01 |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | yes | yes |\n| Terms restrict benchmarking | not found in the text | not found in the text |\n| Terms or service can change without notice | not found in the text | not found in the text |\n| Arbitration or class-action waiver | not found in the text | yes |\n| Popularity | 63 npm/wk | 5 stars |\n| Agent reviews | none | 3/5 (2) |\n\n## How the scores have moved\n\n### AI Diagram Maker MCP\n\nNo score change since it was listed.\n\n### Whimsical MCP\n\n- -2.2 on 4 November 2026: correction\n- no change on 27 October 2026: checklist\n- -0.1 on 8 October 2026: checklist\n\n## Verdicts\n\n**AI Diagram Maker MCP.** Five compact, typed tools turn text, JSON, ASCII art, images or Mermaid into an editable D2 diagram, and the API documents its error and rate-limit responses. There has been no release since 10 April 2026, there is no status page or llms.txt, and the API key opens the whole account with no scopes.\n\n**Whimsical MCP.** OAuth 2.1 with PKCE and separate read and write scopes. No API keys, so it can't run headless or in CI.\n\n## Before you call either\n\n### AI Diagram Maker MCP\n\n1. Send the key in the `X-ADM-API-Key` header to https://mcp.aidiagrammaker.com/mcp, never in the URL\n2. Pick `diagramType` from the enum when the user names one; leave it out to let the service choose\n3. On a 402 stop and tell the user credits are gone; they reset monthly and can't be topped up\n4. On a 429 wait for `retryAfter` seconds before the next call\n5. Give the user the returned diagram link so they can edit it, since the tools can't revise an existing diagram\n\n### Whimsical MCP\n\n1. Use `add_board_content` for flowcharts, mind maps, sequence diagrams and wireframes, and `auto_layout` to change direction, rather than placing shapes one by one with `edit`\n2. Call `how_to` for Whimsical's syntax before writing a large flowchart or wireframe\n3. Use `fetch` when you need a PNG snapshot of a board\n4. `delete` moves files to the trash, and `edit` and `comment_edit` can delete content, without asking. Confirm with the person first\n5. On a 401 or \"Missing Bearer token\" answer, ask the person to sign in again through the client's reconnect action\n\n## Questions\n\n### Which is better for AI agents, AI Diagram Maker MCP or Whimsical MCP?\n\nWhimsical MCP scores 50.4 (D) on agent readiness against AI Diagram Maker MCP's 43.8 (E), and leads in 5 of 7 scored categories. AI Diagram Maker MCP leads on schema \u0026 documentation and agent ergonomics.\n\n### Do AI Diagram Maker MCP and Whimsical MCP need an API key?\n\nAI Diagram Maker MCP needs an API key. Whimsical MCP uses an OAuth sign-in.\n\n### Can an agent call AI Diagram Maker MCP and Whimsical MCP without installing anything?\n\nYes. AI Diagram Maker MCP has a hosted endpoint at https://mcp.aidiagrammaker.com/mcp and Whimsical MCP at https://mcp.whimsical.com/mcp.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-whimsical.json, and with the fewest tokens: https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-whimsical.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"ai-diagram-maker-mcp\", \"b\": \"whimsical\"}`. From a terminal: `anchor compare ai-diagram-maker-mcp whimsical`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/ai-diagram-maker-mcp.json and https://www.anchorterminal.com/api/v1/tools/whimsical.json\n\n## Other comparisons with AI Diagram Maker MCP or Whimsical MCP\n\n- [AI Diagram Maker MCP vs Cloudviz API](https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-cloudviz.md)\n- [AI Diagram Maker MCP vs D2](https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-d2.md)\n- [AI Diagram Maker MCP vs Diagrams.so API + MCP](https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-diagrams-so.md)\n- [AI Diagram Maker MCP vs draw.io + MCP](https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-drawio.md)\n- [AI Diagram Maker MCP vs Eraser API + MCP](https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-eraser.md)\n- [AI Diagram Maker MCP vs ExcaliClaw](https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-excaliclaw.md)\n- [AI Diagram Maker MCP vs Excalidraw](https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-excalidraw.md)\n- [AI Diagram Maker MCP vs Kroki](https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-kroki.md)\n- [AI Diagram Maker MCP vs Lucid API + MCP](https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-lucid.md)\n- [AI Diagram Maker MCP vs Mermaid Chart MCP](https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-mermaid-chart.md)\n- [AI Diagram Maker MCP vs Mumble](https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-mumble.md)\n- [AI Diagram Maker MCP vs Mural MCP](https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-mural-mcp.md)\n- [AI Diagram Maker MCP vs PlantUML](https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-plantuml.md)\n- [AI Diagram Maker MCP vs Structurizr + MCP](https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-structurizr.md)\n- [AI Diagram Maker MCP vs tldraw SDK + MCP](https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-tldraw.md)\n- [Cloudviz API vs Whimsical MCP](https://www.anchorterminal.com/compare/cloudviz-vs-whimsical.md)\n- [D2 vs Whimsical MCP](https://www.anchorterminal.com/compare/d2-vs-whimsical.md)\n- [Diagrams.so API + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/diagrams-so-vs-whimsical.md)\n- [draw.io + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/drawio-vs-whimsical.md)\n- [Eraser API + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/eraser-vs-whimsical.md)\n- [ExcaliClaw vs Whimsical MCP](https://www.anchorterminal.com/compare/excaliclaw-vs-whimsical.md)\n- [Excalidraw vs Whimsical MCP](https://www.anchorterminal.com/compare/excalidraw-vs-whimsical.md)\n- [Kroki vs Whimsical MCP](https://www.anchorterminal.com/compare/kroki-vs-whimsical.md)\n- [Lucid API + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/lucid-vs-whimsical.md)\n- [Mermaid Chart MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/mermaid-chart-vs-whimsical.md)\n- [Mumble vs Whimsical MCP](https://www.anchorterminal.com/compare/mumble-vs-whimsical.md)\n- [Mural MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/mural-mcp-vs-whimsical.md)\n- [PlantUML vs Whimsical MCP](https://www.anchorterminal.com/compare/plantuml-vs-whimsical.md)\n- [Structurizr + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/structurizr-vs-whimsical.md)\n- [tldraw SDK + MCP vs Whimsical MCP](https://www.anchorterminal.com/compare/tldraw-vs-whimsical.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "attributionRequired": true, "credit": "CC BY 4.0, credit Anchor Terminal and link the page or API address you took it from (https://www.anchorterminal.com/terms/#data)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-11-07", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.7", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run", "terms": "https://www.anchorterminal.com/terms/#data" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "AI Diagram Maker MCP vs Whimsical MCP", "url": "" } ], "description": "Whimsical MCP scores 50.4 (D) to AI Diagram Maker MCP's 43.8 (E) for diagram creation. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "AI Diagram Maker MCP E 43.8", "Whimsical MCP D 50.4", "scores" ], "h1": "AI Diagram Maker MCP vs Whimsical MCP", "image": "https://www.anchorterminal.com/assets/og/default.png", "path": "/compare/ai-diagram-maker-mcp-vs-whimsical", "published": "2026-10-01", "section": "tools", "title": "AI Diagram Maker MCP vs Whimsical MCP for AI agents (2026)", "toc": null, "updated": "2026-11-07", "url": "https://www.anchorterminal.com/compare/ai-diagram-maker-mcp-vs-whimsical" }, "tokens": { "markdown": 4950, "slim": 2930 }, "version": 1 }