Reference

ctx_session

Input contract and parameters for ctx_session.

Status by featureReviewed September 2026

MCP tool · Session state

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.

Example call

JSON for an MCP client. Replace example paths and queries with your own project values.

{
  "name": "ctx_session",
  "arguments": {
    "action": "status"
  }
}

Parameters

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

actionstringRequired

keep_recent_turnsinteger

compact: trailing user turns kept verbatim (default 6)

session_idstring

Omit for latest

valuestring

Exact JSON schema

Inspect the complete input schema

{
  "properties": {
    "action": {
      "description": "status|handoff|load|save|task|finding|decision|compact|restore|list|… (invalid action lists all)",
      "type": "string"
    },
    "keep_recent_turns": {
      "description": "compact: trailing user turns kept verbatim (default 6)",
      "type": "integer"
    },
    "session_id": {
      "description": "Omit for latest",
      "type": "string"
    },
    "value": {
      "type": "string"
    }
  },
  "required": [
    "action"
  ],
  "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

Session memory. save at session end, load at start, status = snapshot;
task|finding|decision record progress (value=text).
ANTIPATTERN: permanent project knowledge → 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