@modelcontextprotocol/server-sequential-thinking

Implements a Model Context Protocol (MCP) server that exposes sequential thinking as a standardized tool interface, allowing Claude and other MCP-compatible clients to invoke structured reasoning workflows through a bidirectional JSON-RPC protocol. The server registers thinking tools that clients can discover and call, with built-in support for streaming responses and tool result callbacks.

Automatically registers thinking tools with the MCP server and exposes them through the standard MCP tools/list endpoint, allowing clients to discover available thinking capabilities via JSON-RPC introspection. Tools are defined with schemas that describe input parameters, output format, and thinking behavior, enabling clients to validate requests before invocation.

Streams thinking process output in real-time to MCP clients using JSON-RPC streaming responses, allowing clients to display intermediate reasoning steps as they are generated rather than waiting for complete computation. Implements buffering and flushing strategies to balance latency and throughput while maintaining protocol compliance.

Executes multi-step thinking workflows that decompose problems into sequential reasoning phases (e.g., problem analysis, hypothesis generation, validation), with each phase receiving input from previous phases. Implements state threading through the workflow to maintain context and enable iterative refinement of reasoning.

Maintains reasoning context across multiple MCP tool invocations within a single conversation, allowing subsequent thinking operations to reference and build upon previous reasoning steps. Implements context threading through tool parameters and results, enabling multi-turn reasoning without explicit context management by the client.

Allows clients to specify thinking depth parameters (e.g., number of reasoning steps, time budget, complexity level) that constrain the scope and duration of thinking operations. Implements parameter validation and enforcement to prevent runaway thinking processes that exceed client-specified limits.

Transforms raw thinking output into structured formats (JSON, markdown, plain text) that clients can easily parse and integrate into their applications. Implements extraction logic to identify key insights, conclusions, and reasoning steps from unstructured thinking text, enabling downstream processing and analysis.

Implements error handling for thinking operations that fail or produce invalid results, with recovery strategies such as automatic retry, fallback to simpler reasoning, or graceful degradation. Provides detailed error messages and metadata to help clients diagnose thinking failures and adjust parameters.

Records detailed logs of thinking operations including input, output, execution time, token usage, and reasoning steps, enabling post-hoc analysis and debugging of reasoning workflows. Implements structured logging that integrates with standard observability tools (e.g., OpenTelemetry, Datadog) for monitoring thinking performance and quality.

Enables multiple MCP clients to coordinate thinking operations through a shared MCP server, allowing clients to share reasoning results, reference each other's thinking, and collaborate on complex problem-solving. Implements client isolation and conflict resolution to prevent interference between concurrent thinking operations.