Clear Thought 1.5 vs Sequential Thinking (MCP reference server)

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.

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.

Clear Thought 1.5

1. Call clear_thought with operation and prompt. Put everything else in parameters, using the field names in the guide://clear-thought-operations resource
2. Do not call mdp_planning or decision_networks. The README shows them, and the tool's operation enum rejects both
3. Expect an extra initialThought object on 32 of the 37 operations, and each one uses a slot of the 100-thought session limit
4. Stop the server process yourself when the session ends. Open issues report that it does not exit when the client disconnects
5. Treat notebook_run_cell as unsandboxed code execution on the host, and do not pass it code from untrusted content

Sequential Thinking (MCP reference server)

1. Call it as sequentialthinking, not sequential_thinking
2. Set totalThoughts low and raise it only when a revision needs room
3. Restart the server between unrelated problems, or ignore thoughtHistoryLength and branches from earlier work
4. Skip it when the host model already has extended thinking