Reference

ctx_summary

Input contract and parameters for ctx_summary.

Status by featureReviewed September 2026

MCP tool · Knowledge tools

Call this tool through your MCP client. Its availability depends on your active configuration and profile.

This registry contract is separate from the SDK. For terminal commands, use the CLI reference.

Parameters

Generated from the registered input schema. “Required” reflects the schema; individual actions can impose additional requirements.

actionstring

recall|record|list

Accepted: recallrecordlist

querystring

Recall query, e.g. "what did I change?"

top_kinteger

Max summaries to return

Exact JSON schema

Inspect the complete input schema

{
  "properties": {
    "action": {
      "description": "recall|record|list",
      "enum": [
        "recall",
        "record",
        "list"
      ],
      "type": "string"
    },
    "query": {
      "description": "Recall query, e.g. \"what did I change?\"",
      "type": "string"
    },
    "top_k": {
      "description": "Max summaries to return",
      "type": "integer"
    }
  },
  "required": [],
  "type": "object"
}

Runtime description

The following is the tool's own agent-facing description, reproduced from the reviewed registry. It can contain implementation terminology; it does not expand the public stability commitment.

Read the agent-facing description

WORKFLOW: record after tasks → recall with query.
Compact session digests (task, files, decisions, next steps).
Actions: recall|record|list. Auto-captured on checkpoints.
ANTIPATTERN: structured facts → ctx_knowledge.

Sources & versions3 references Reviewed 18 Sept 2026

mcp_manifest.rsrust/src/core/mcp_manifest.rsReviewed checkout
registry.rsrust/src/server/registry.rsReviewed checkout
dynamic_tools.rsrust/src/server/dynamic_tools.rsReviewed checkout

Core checkout: 50fbff09c9
Installed runtime: 3.10.2
SDK release: 1.1.0

Separate baselines for source, CLI/configuration and SDK contracts. Review does not certify every platform or integration.

Versions & compatibility