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An MCP server that implements sequential thinking through a detailed tool for dynamic and reflective problem-solving. Supports thought tracking, branching, revisions, and hypothesis generation/verification across multiple thinking steps.
Single tool 'sequentialthinking' has a comprehensive description (1200+ chars) explaining use cases and features, exceeding the 10-1024 char guideline. Input schema is well-defined with 10 parameters, all typed and described. However, the tool violates single-responsibility principle by combining thought tracking, branching, revision, and hypothesis verification into one endpoint. Output schema is documented but lacks pagination/limits guidance. Error handling is minimal (generic 'Unknown error' catch-all). No tool annotations (readOnlyHint, destructiveHint, idempotentHint) present. Parameter descriptions are thorough but the tool's complexity and stateful session management (sessionId) suggest it should be decomposed into separate tools for different reasoning phases.
A detailed tool for dynamic and reflective problem-solving through thoughts. This tool helps analyze problems through a flexible thinking process that can adapt and evolve. Each thought can build on, question, or revise previous insights as understanding deepens. When to use this tool: - Breaking down complex problems into steps - Planning and design with room for revision - Analysis that might need course correction - Problems where the full scope might not be clear initially - Problems that require a multi-step solution - Tasks that need to maintain context over multiple steps - Situations where irrelevant information needs to be filtered out Key features: - You can adjust total_thoughts up or down as you progress - You can question or revise previous thoughts - You can add more thoughts even after reaching what seemed like the end - You can express uncertainty and explore alternative approaches - Not every thought needs to build linearly - you can branch or backtrack - Generates a solution hypothesis - Verifies the hypothesis based on the Chain of Thought steps - Repeats the process until satisfied - Provides a correct answer
Tool violates single-responsibility principle. 'sequentialthinking' combines thought tracking, branching logic, revision handling, and hypothesis verification. Should split into separate tools: add_thought, revise_thought, branch_thought, verify_hypothesis.
Generic error handling. Catch-all exception returns 'Unknown error' with no recovery guidance. LLM cannot determine if error is retryable, user-fixable, or fatal. Should return structured error with error_code, message, and next_action.
No tool annotations. Missing readOnlyHint, destructiveHint, and idempotentHint. The tool modifies server state (adds to _thoughtHistory, manages _branches) but does not declare this to the LLM.
Output schema not formally documented. ProcessThoughtResponse structure is inferred from code but not exposed in tool definition. LLM cannot plan downstream calls without knowing return fields (Thought, ThoughtNumber, TotalThoughts, NextThoughtNeeded, Branches, ThoughtHistoryLength).
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-23 | C | 67 | 2026-07-28+ | v2 |
Stateful session management via sessionId parameter. Tool relies on server-side state (_thoughtHistory, _branches per session). This couples the tool to a specific server instance and breaks stateless request handling required by current MCP spec.