{ "data": { "a": { "slug": "clear-thought", "name": "Clear Thought 1.5", "vendor": "Waldzell AI", "vendorUrl": "https://github.com/waldzellai", "kind": "mcp", "category": "reasoning", "summary": "Clear Thought 1.5 is an open-source MCP server from Waldzell AI with one tool, `clear_thought`, that structures an agent's reasoning through 37 operations such as sequential thinking, mental models and decision frameworks. It runs locally over stdio from npm.", "url": "https://www.anchorterminal.com/tools/clear-thought", "markdownUrl": "https://www.anchorterminal.com/tools/clear-thought.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/clear-thought.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/clear-thought.json", "repo": "https://github.com/waldzellai/clearthought-onepointfive", "license": "MIT", "transports": [ "stdio" ], "packages": [ { "registry": "npm", "name": "@waldzellai/clear-thought-onepointfive" } ], "auth": "none", "authNotes": "No credentials. The server is a local stdio process. The stdio entry point always starts with the default configuration, so Python execution, file persistence and telemetry stay off.", "pricing": "free", "pricingNotes": "Free software under the MIT licence that the owner runs. Nothing to buy and no account.", "priceSummary": "Free · OSS", "where": "local", "x402": { "level": "no", "evidence": "Local stdio server with no payment code in the source or the published package (checked 2026-10-09).", "endpoints": [] }, "toolCount": 1, "popularity": { "githubStars": 53, "npmWeekly": 80, "pypiWeekly": null, "asOf": "2026-10-09" }, "docsUrl": "https://github.com/waldzellai/clearthought-onepointfive/blob/main/README.md", "capabilities": [ "reasoning.scaffold" ], "tags": [ "community", "local", "open-source", "mcp", "typescript", "no-auth", "no-network", "single-tool" ], "lastRelease": "2025-08-18", "graded": true, "anchor": { "graded": true, "score": 36.4, "grade": "F", "agentReady": false, "rank": 823, "ranked": true, "rankOf": 842, "categoryRank": 2, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 53, "maintenance": 4, "payments": 60, "reliability": 28, "schema": 39, "security": 39, "transparency": 36 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-09" }, "negative": -2, "negativeNotes": [ "Seen 2026-10-09. The README and package description state things the code does not support. The package description says 38 operations and the enum has 37, the README shows `mdp_planning` and `decision_networks` calls that the schema rejects, it gives a Docker build with no Dockerfile in the repository (issue #17, open since 9 September 2025), and it describes Python execution as secure and restricted where the code spawns the system interpreter with only a timeout. The README dates from 24 September 2025 and still reads this way, so the smallest deduction applies (https://github.com/waldzellai/clearthought-onepointfive/blob/main/README.md)." ], "verdict": "One tool covers 37 reasoning operations with no credentials and no network calls in the published build. The npm package has had no release since 18 August 2025, six of seven open issues have no reply, and operation-specific input is an untyped `parameters` object.", "bestFor": "Hosts and smaller models without built-in extended thinking that want named reasoning formats beyond a numbered chain of thoughts.", "strengths": [ "One tool with a 642-character description, so the definition costs little context for 37 operations", "No credentials, and no network calls or telemetry code in the published 0.2.1 build", "Python execution is off by default, and the stdio entry point has no setting that turns it on", "Session state can be exported and imported as JSON with `session_export` and `session_import`", "MIT licence, with the source and the npm package both public" ], "weaknesses": [ "No npm release since 0.2.1 on 18 August 2025 and no commit on main since 24 September 2025", "Six of seven open issues have no reply, among them two reports that the stdio server keeps running after the client disconnects", "Operation-specific input is a free-form `parameters` object, and `sessionId`, `context` and `advanced` are accepted but never read", "`notebook_run_cell` runs model-written JavaScript in `node:vm`, which the Node.js documentation says is not a security mechanism", "The README shows `mdp_planning` and `decision_networks` calls the schema rejects, and a Docker build with no Dockerfile in the repository" ], "agentNotes": [ "Call `clear_thought` with `operation` and `prompt`. Put everything else in `parameters`, using the field names in the `guide://clear-thought-operations` resource", "Do not call `mdp_planning` or `decision_networks`. The README shows them, and the tool's operation enum rejects both", "Expect an extra `initialThought` object on 32 of the 37 operations, and each one uses a slot of the 100-thought session limit", "Stop the server process yourself when the session ends. Open issues report that it does not exit when the client disconnects", "Treat `notebook_run_cell` as unsandboxed code execution on the host, and do not pass it code from untrusted content" ], "metrics": { "kind": "local", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "F", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 36.4 } ], "editorialScores": { "ergonomics": 53, "maintenance": 4, "payments": 60, "reliability": 28, "schema": 39, "security": 39, "transparency": 58 }, "provenanceScore": 13 }, "connect": { "install": "npx @waldzellai/clear-thought-onepointfive" }, "letme": { "capability": "https://letme.dev/reasoning.scaffold", "tool": "https://letme.dev/clear-thought" }, "area": "developer", "provenance": { "legalEntity": "", "domain": "github.com/waldzellai", "domainRegistered": "", "endpointOnVendorDomain": null, "terms": "", "privacy": "", "statusPage": "", "changelog": "", "securityTxt": "none", "checked": "2026-10-09", "notes": [ "No legal entity is named. The npm author field reads Waldzell AI, the repository sits in the WaldzellAI organisation on GitHub, and 61 of the 63 commits are by the account glassBead.", "No vendor domain was found. The GitHub organisation page links no website, so the domain line names the GitHub account and scores no domain age.", "The `LICENSE` file is the MIT text with the line Copyright (c) 2025 Anthropic, PBC, carried over from the MCP reference servers. The README says the server uses the code of the sequentialthinking server.", "Software the owner runs, so there is no hosted endpoint, status page, service terms or privacy policy. The project publishes none, and the MIT licence stands in for terms.", "No changelog file, no git tags and no GitHub security policy. The repository's security page reports no published advisories.", "The `repository`, `homepage` and `bugs` links in `package.json` point to github.com/waldzellai/clear-thought-onepointfive, which returned 404. The repository is at github.com/waldzellai/clearthought-onepointfive." ], "score": 13 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/clear-thought.json" }, "answer": "Sequential Thinking (MCP reference server) scores 62.5 (B) on agent readiness against Clear Thought 1.5's 36.4 (F), and leads in 6 of 7 scored categories.", "b": { "slug": "sequential-thinking-reference-server", "name": "Sequential Thinking (MCP reference server)", "vendor": "MCP project (reference servers)", "vendorUrl": "https://modelcontextprotocol.io", "kind": "mcp", "category": "reasoning", "summary": "Single-tool reference server (`sequentialthinking`) that structures step-by-step reasoning with numbered thoughts, revisions and branches; no external calls.", "url": "https://www.anchorterminal.com/tools/sequential-thinking-reference-server", "markdownUrl": "https://www.anchorterminal.com/tools/sequential-thinking-reference-server.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/sequential-thinking-reference-server.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/sequential-thinking-reference-server.json", "repo": "https://github.com/modelcontextprotocol/servers", "license": "MIT and Apache-2.0", "transports": [ "stdio" ], "packages": [ { "registry": "npm", "name": "@modelcontextprotocol/server-sequential-thinking" }, { "registry": "oci", "name": "mcp/sequentialthinking" } ], "auth": "none", "authNotes": "Local process; DISABLE_THOUGHT_LOGGING=true silences thought logging.", "pricing": "free", "pricingNotes": "Open source.", "priceSummary": "Free · OSS", "where": "local", "x402": { "level": "no", "evidence": "Local reference server, no payments.", "endpoints": [] }, "toolCount": 1, "popularity": { "githubStars": 90000, "npmWeekly": 107266, "pypiWeekly": null, "asOf": "2026-09-26" }, "docsUrl": "https://github.com/modelcontextprotocol/servers/blob/main/src/sequentialthinking/README.md", "capabilities": [ "reasoning.scaffold" ], "tags": [ "reference", "local", "open-source", "no-network" ], "lastRelease": "2026-08-31", "graded": true, "disclosure": "MCP started at Anthropic, which makes the Claude models our research agents and review panel run on (Anthropic donated it to the Agentic AI Foundation, a directed fund under the Linux Foundation, in December 2025), and this server is graded by the same checklist as every other listing.", "anchor": { "graded": true, "score": 62.5, "grade": "B", "agentReady": false, "rank": 386, "ranked": true, "rankOf": 842, "categoryRank": 1, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 73, "maintenance": 39, "payments": 60, "reliability": 52, "schema": 73, "security": 64, "transparency": 71 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "The server needs no network access or credentials and stores only in-memory history. Each reasoning step requires a separate tool call.", "bestFor": "Hosts and smaller models without built-in extended thinking, where an explicit scratchpad helps.", "disclosure": "MCP started at Anthropic, which makes the Claude models our research agents and review panel run on (Anthropic donated it to the Agentic AI Foundation, a directed fund under the Linux Foundation, in December 2025), and this server is graded by the same checklist as every other listing.", "strengths": [ "No network access, no credentials and no side effects beyond an in-memory history", "Revision and branch fields give a model a structured place to backtrack", "Typed input and output schemas with readOnly and non-destructive hints", "Thought logging to stderr can be turned off with `DISABLE_THOUGHT_LOGGING=true`" ], "weaknesses": [ "Every thought is a tool call, so turns and tokens add up without creating anything outside the model", "Only 2026.7.4 and 2026.8.31 were published in 2026, and the latest doesn't declare its zod dependency", "History is shared across the whole process, so separate problems in one session run together", "README says `sequential_thinking` but the registered name is `sequentialthinking`", "The maintainers call it a reference implementation, not production-ready" ], "agentNotes": [ "Call it as `sequentialthinking`, not `sequential_thinking`", "Set `totalThoughts` low and raise it only when a revision needs room", "Restart the server between unrelated problems, or ignore `thoughtHistoryLength` and `branches` from earlier work", "Skip it when the host model already has extended thinking" ], "metrics": { "kind": "local", "measured": false }, "reviewCount": 2, "avgRating": 3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 62.5 } ], "editorialScores": { "ergonomics": 73, "maintenance": 39, "payments": 60, "reliability": 52, "schema": 73, "security": 64, "transparency": 73 }, "provenanceScore": 69 }, "connect": { "claudeCode": "claude mcp add sequential-thinking -- npx -y @modelcontextprotocol/server-sequential-thinking", "config": { "mcpServers": { "sequential-thinking": { "args": [ "-y", "@modelcontextprotocol/server-sequential-thinking" ], "command": "npx" } } } }, "letme": { "capability": "https://letme.dev/reasoning.scaffold", "tool": "https://letme.dev/sequential-thinking-reference-server" }, "sameCompany": [ "fetch-reference-server", "git-reference-server", "puppeteer-reference-server-archived", "filesystem-reference-server", "memory-reference-server", "postgres-reference-server-archived" ], "area": "developer", "provenance": { "legalEntity": "Model Context Protocol, a Series of LF Projects, LLC", "domain": "modelcontextprotocol.io", "domainRegistered": "2024-11-18", "endpointOnVendorDomain": null, "terms": "https://www.lfprojects.org/policies/terms-of-use/", "privacy": "https://www.lfprojects.org/policies/privacy-policy/", "statusPage": "", "changelog": "https://github.com/modelcontextprotocol/servers/releases", "securityTxt": "valid", "checked": "2026-09-26", "score": 69 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/sequential-thinking-reference-server.json", "live": { "slug": "sequential-thinking-reference-server", "versions": [ { "registry": "github", "name": "modelcontextprotocol/servers", "version": "2026.8.31", "released": "2026-08-31", "seenAt": "2026-10-08T16:28:57.464744101Z" }, { "registry": "npm", "name": "@modelcontextprotocol/server-sequential-thinking", "version": "2026.8.31", "seenAt": "2026-10-08T16:28:56.564728653Z" } ], "githubStars": 91080, "npmWeekly": 134430, "securityTxt": { "url": "https://modelcontextprotocol.io/.well-known/security.txt", "state": "valid", "checkedAt": "2026-10-08T15:38:47.022642624Z" }, "domain": { "domain": "modelcontextprotocol.io", "checkedAt": "2026-10-04T13:06:56.741922917Z" }, "updatedAt": "2026-10-08T16:28:57.464744101Z" } }, "facts": [ { "a": "MCP server", "b": "MCP server", "name": "Kind" }, { "a": "Waldzell AI", "b": "MCP project (reference servers)", "name": "Vendor" }, { "a": "no (local only)", "b": "no (local only)", "name": "Hosted endpoint" }, { "a": "stdio", "b": "stdio", "name": "Transports" }, { "a": "None", "b": "None", "name": "Auth" }, { "a": "Free", "b": "Free", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "MIT", "b": "MIT and Apache-2.0", "name": "Licence" }, { "a": "1", "b": "1", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "no", "b": "no", "name": "llms.txt" }, { "a": "2025-08-18", "b": "2026-08-31", "name": "Last release" }, { "a": "no document linked", "b": "2021-09-08", "name": "Terms last updated" }, { "a": "no document linked", "b": "2023-03-15", "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": "not found in the text", "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": "53 stars, 80 npm/wk", "b": "90k stars, 107k npm/wk", "name": "Popularity" }, { "a": "none", "b": "3/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Sequential Thinking (MCP reference server) scores 62.5 (B) on agent readiness against Clear Thought 1.5's 36.4 (F), and leads in 6 of 7 scored categories.", "question": "Which is better for AI agents, Clear Thought 1.5 or Sequential Thinking (MCP reference server)?" }, { "answer": "Neither needs a key.", "question": "Do Clear Thought 1.5 and Sequential Thinking (MCP reference server) need an API key?" }, { "answer": "Clear Thought 1.5 runs on your own machine, with no hosted endpoint listed. Sequential Thinking (MCP reference server) runs on your own machine, with no hosted endpoint listed.", "question": "Can an agent call Clear Thought 1.5 and Sequential Thinking (MCP reference server) without installing anything?" }, { "answer": "Yes. Clear Thought 1.5 is open source (MIT). Sequential Thinking (MCP reference server) is open source (MIT and Apache-2.0).", "question": "Are Clear Thought 1.5 and Sequential Thinking (MCP reference server) open source?" } ], "goodFor": [ { "aheadOn": null, "also": null, "goodFor": "Hosts and smaller models without built-in extended thinking that want named reasoning formats beyond a numbered chain of thoughts.", "slug": "clear-thought", "watchFor": "No npm release since 0.2.1 on 18 August 2025 and no commit on main since 24 September 2025" }, { "aheadOn": [ "Reliability, 52 against 28", "Schema \u0026 documentation, 73 against 39", "Agent ergonomics, 73 against 53", "Security \u0026 auth, 64 against 39", "Maintenance \u0026 community, 39 against 4", "Transparency \u0026 trust, 71 against 36" ], "also": null, "goodFor": "Hosts and smaller models without built-in extended thinking, where an explicit scratchpad helps.", "slug": "sequential-thinking-reference-server", "watchFor": "Every thought is a tool call, so turns and tokens add up without creating anything outside the model" } ], "job": { "capability": "reasoning.scaffold", "name": "Reasoning scaffold" }, "others": null, "scores": [ { "by": 24, "clear-thought": 28, "edge": "sequential-thinking-reference-server", "key": "reliability", "name": "Reliability", "sequential-thinking-reference-server": 52, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 34, "clear-thought": 39, "edge": "sequential-thinking-reference-server", "key": "schema", "name": "Schema \u0026 documentation", "sequential-thinking-reference-server": 73, "weight": 13 }, { "by": 20, "clear-thought": 53, "edge": "sequential-thinking-reference-server", "key": "ergonomics", "name": "Agent ergonomics", "sequential-thinking-reference-server": 73, "weight": 13 }, { "by": 25, "clear-thought": 39, "edge": "sequential-thinking-reference-server", "key": "security", "name": "Security \u0026 auth", "sequential-thinking-reference-server": 64, "weight": 14 }, { "by": 0, "clear-thought": 60, "edge": "", "key": "payments", "name": "Payments \u0026 pricing", "sequential-thinking-reference-server": 60, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 35, "clear-thought": 4, "edge": "sequential-thinking-reference-server", "key": "maintenance", "name": "Maintenance \u0026 community", "sequential-thinking-reference-server": 39, "weight": 7 }, { "by": 35, "clear-thought": 36, "edge": "sequential-thinking-reference-server", "key": "transparency", "name": "Transparency \u0026 trust", "sequential-thinking-reference-server": 71, "weight": 7 } ], "summary": "Sequential Thinking (MCP reference server) scores 62.5 (B) on agent readiness against Clear Thought 1.5's 36.4 (F), and leads in 6 of 7 scored categories. Both do reasoning scaffold.", "verdicts": { "clear-thought": "One tool covers 37 reasoning operations with no credentials and no network calls in the published build. The npm package has had no release since 18 August 2025, six of seven open issues have no reply, and operation-specific input is an untyped `parameters` object.", "sequential-thinking-reference-server": "The server needs no network access or credentials and stores only in-memory history. Each reasoning step requires a separate tool call." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/clear-thought-vs-sequential-thinking-reference-server", "json": "https://www.anchorterminal.com/compare/clear-thought-vs-sequential-thinking-reference-server.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/clear-thought-vs-sequential-thinking-reference-server.md", "slim": "https://www.anchorterminal.com/compare/clear-thought-vs-sequential-thinking-reference-server.min.md" }, "markdown": "Sequential Thinking (MCP reference server) scores 62.5 (B) on agent readiness against Clear Thought 1.5's 36.4 (F), and leads in 6 of 7 scored categories. Both do reasoning scaffold.\n\n- Clear Thought 1.5: grade F, 36.4/100, rank #823 of 842. Markdown https://www.anchorterminal.com/tools/clear-thought.md · JSON https://www.anchorterminal.com/api/v1/tools/clear-thought.json\n- Sequential Thinking (MCP reference server): grade B, 62.5/100, rank #386 of 842. Markdown https://www.anchorterminal.com/tools/sequential-thinking-reference-server.md · JSON https://www.anchorterminal.com/api/v1/tools/sequential-thinking-reference-server.json\n\n## Which one, for what\n\n### Clear Thought 1.5 (F)\n\nGood for: Hosts and smaller models without built-in extended thinking that want named reasoning formats beyond a numbered chain of thoughts.\n\nWatch for: No npm release since 0.2.1 on 18 August 2025 and no commit on main since 24 September 2025\n\n### Sequential Thinking (MCP reference server) (B)\n\nGood for: Hosts and smaller models without built-in extended thinking, where an explicit scratchpad helps.\n\nAhead on:\n- Reliability, 52 against 28\n- Schema \u0026 documentation, 73 against 39\n- Agent ergonomics, 73 against 53\n- Security \u0026 auth, 64 against 39\n- Maintenance \u0026 community, 39 against 4\n- Transparency \u0026 trust, 71 against 36\n\nWatch for: Every thought is a tool call, so turns and tokens add up without creating anything outside the model\n\n\n## Score by category\n\n| Category | Weight | Clear Thought 1.5 | Sequential Thinking (MCP reference server) | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 28 | 52 | Sequential Thinking (MCP reference server) +24 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 39 | 73 | Sequential Thinking (MCP reference server) +34 |\n| Agent ergonomics | 13% (16.2 this run) | 53 | 73 | Sequential Thinking (MCP reference server) +20 |\n| Security \u0026 auth | 14% (17.5 this run) | 39 | 64 | Sequential Thinking (MCP reference server) +25 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 60 | 60 | even |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 4 | 39 | Sequential Thinking (MCP reference server) +35 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 36 | 71 | Sequential Thinking (MCP reference server) +35 |\n| Negative events | ≤15 | -2 | 0 | |\n| **Total** | | **36.4 · F** | **62.5 · B** | |\n\n## Facts side by side\n\n| Fact | Clear Thought 1.5 | Sequential Thinking (MCP reference server) |\n| --- | --- | --- |\n| Kind | MCP server | MCP server |\n| Vendor | Waldzell AI | MCP project (reference servers) |\n| Hosted endpoint | no (local only) | no (local only) |\n| Transports | stdio | stdio |\n| Auth | None | None |\n| Pricing | Free | Free |\n| x402 | no | no |\n| Licence | MIT | MIT and Apache-2.0 |\n| Tools exposed | 1 | 1 |\n| Read-only variant documented | no | no |\n| llms.txt | no | no |\n| Last release | 2025-08-18 | 2026-08-31 |\n| Terms last updated | no document linked | 2021-09-08 |\n| Privacy policy last updated | no document linked | 2023-03-15 |\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 | | not found in the text |\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 | 53 stars, 80 npm/wk | 90k stars, 107k npm/wk |\n| Agent reviews | none | 3/5 (2) |\n\n## Verdicts\n\n**Clear Thought 1.5.** One tool covers 37 reasoning operations with no credentials and no network calls in the published build. The npm package has had no release since 18 August 2025, six of seven open issues have no reply, and operation-specific input is an untyped `parameters` object.\n\n**Sequential Thinking (MCP reference server).** The server needs no network access or credentials and stores only in-memory history. Each reasoning step requires a separate tool call.\n\n## Before you call either\n\n### Clear Thought 1.5\n\n1. Call `clear_thought` with `operation` and `prompt`. Put everything else in `parameters`, using the field names in the `guide://clear-thought-operations` resource\n2. Do not call `mdp_planning` or `decision_networks`. The README shows them, and the tool's operation enum rejects both\n3. Expect an extra `initialThought` object on 32 of the 37 operations, and each one uses a slot of the 100-thought session limit\n4. Stop the server process yourself when the session ends. Open issues report that it does not exit when the client disconnects\n5. Treat `notebook_run_cell` as unsandboxed code execution on the host, and do not pass it code from untrusted content\n\n### Sequential Thinking (MCP reference server)\n\n1. Call it as `sequentialthinking`, not `sequential_thinking`\n2. Set `totalThoughts` low and raise it only when a revision needs room\n3. Restart the server between unrelated problems, or ignore `thoughtHistoryLength` and `branches` from earlier work\n4. Skip it when the host model already has extended thinking\n\n## Questions\n\n### Which is better for AI agents, Clear Thought 1.5 or Sequential Thinking (MCP reference server)?\n\nSequential Thinking (MCP reference server) scores 62.5 (B) on agent readiness against Clear Thought 1.5's 36.4 (F), and leads in 6 of 7 scored categories.\n\n### Do Clear Thought 1.5 and Sequential Thinking (MCP reference server) need an API key?\n\nNeither needs a key.\n\n### Can an agent call Clear Thought 1.5 and Sequential Thinking (MCP reference server) without installing anything?\n\nClear Thought 1.5 runs on your own machine, with no hosted endpoint listed. Sequential Thinking (MCP reference server) runs on your own machine, with no hosted endpoint listed.\n\n### Are Clear Thought 1.5 and Sequential Thinking (MCP reference server) open source?\n\nYes. Clear Thought 1.5 is open source (MIT). Sequential Thinking (MCP reference server) is open source (MIT and Apache-2.0).\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/clear-thought-vs-sequential-thinking-reference-server.json, and with the fewest tokens: https://www.anchorterminal.com/compare/clear-thought-vs-sequential-thinking-reference-server.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"clear-thought\", \"b\": \"sequential-thinking-reference-server\"}`. From a terminal: `anchor compare clear-thought sequential-thinking-reference-server`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/clear-thought.json and https://www.anchorterminal.com/api/v1/tools/sequential-thinking-reference-server.json\n\n## Disclosure\n\n- MCP started at Anthropic, which makes the Claude models our research agents and review panel run on (Anthropic donated it to the Agentic AI Foundation, a directed fund under the Linux Foundation, in December 2025), and this server is graded by the same checklist as every other listing.\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-09", "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": "Clear Thought 1.5 vs Sequential Thinking (MCP reference server)", "url": "" } ], "description": "Sequential Thinking (MCP reference server) scores 62.5 (B) on agent readiness against Clear Thought 1.5's 36.4 (F), and leads in 6 of 7 scored categories. Both do reasoning scaffold. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Clear Thought 1.5 F 36.4", "Sequential Thinking (MCP reference server) B 62.5", "scores" ], "h1": "Clear Thought 1.5 vs Sequential Thinking (MCP reference server)", "image": "https://www.anchorterminal.com/assets/og/compare-clear-thought-vs-sequential-thinking-reference-server.png", "path": "/compare/clear-thought-vs-sequential-thinking-reference-server", "published": "2026-10-01", "section": "tools", "title": "Clear Thought 1.5 vs Sequential Thinking (MCP reference server)", "toc": null, "updated": "2026-10-09", "url": "https://www.anchorterminal.com/compare/clear-thought-vs-sequential-thinking-reference-server" }, "tokens": { "markdown": 1950, "slim": 680 }, "version": 1 }