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v63

latestOpenAPI 3.0.0Proprietaryraw.githubusercontent.com2026-08-0110571.8 MB
Tool Router

Patch a tool router session config (v3.1)

Partially updates the configuration of an existing tool router session. Only the fields provided in the request body will be updated. Uses optimistic concurrency control to prevent lost updates. The previous config is stored in config history.

patch/api/v3.1/tool_router/session/{session_id}

Path parameters

session_idstring toolRouterSessionId required

The unique identifier of the tool router session

Example:trs_1a2b3c4d5e6f

The unique identifier of the tool router session

Request body

auth_configsobject

The auth configs to use for the session. This will override the default behavior and use the given auth config when specific toolkits are being executed

connected_accountsobject nullable

The connected accounts to use for the session, as an array of nano-IDs per toolkit. This overrides the default behaviour and pins specific connected accounts when toolkits are executed. Each account must exist (not deleted or disabled) and belong to the same user_id as the session. Multi-account sessions can pin multiple; non-multi-account sessions are capped at length 1.

toolsobject

Tool-level configuration per toolkit. Allows you to enable, disable, or filter by tags for specific tools within each toolkit. Every slug passed in enable / disable must be a valid Composio tool slug for that toolkit — invalid or typo'd slugs fail session creation with a clear error listing which ones didn't match.

Example request

{
  "toolkits": {
    "enable": [
      "gmail",
      "slack",
      "github"
    ]
  },
  "auth_configs": {
    "gmail": "ac_1a2b3c4d5e6f",
    "slack": "ac_7g8h9i0j1k2l"
  },
  "manage_connections": {
    "enable": true,
    "callback_url": "https://your-app.com/auth/callback"
  },
  "tools": {
    "gmail": {
      "enable": [
        "GMAIL_SEND_EMAIL",
        "GMAIL_FETCH_EMAILS"
      ]
    },
    "slack": {
      "disable": [
        "SLACK_ADD_EMOJI"
      ]
    },
    "slackbot": {
      "tags": {
        "enable": [
          "destructiveHint"
        ],
        "disable": [
          "openWorldHint"
        ]
      }
    }
  },
  "workbench": {
    "enable": true,
    "enable_proxy_execution": true,
    "auto_offload_threshold": 20000,
    "sandbox_size": "large"
  },
  "multi_account": {
    "enable": true,
    "max_accounts_per_toolkit": 5
  }
}

Response

Session config successfully patched.

session_idstring toolRouterSessionId required

The identifier of the session

tool_router_toolsstring[] required

List of available tools in this session

config_versioninteger required

Monotonic version of the config. Incremented on each PATCH. Use for optimistic concurrency control.

Example response

{
  "session_id": "trs_1a2b3c4d5e6f",
  "mcp": {
    "url": "https://app.composio.dev/tool_router/v3/trs_1a2b3c4d5e6f/mcp"
  },
  "warnings": [
    {
      "code": "PRELOAD_TOOLS_HIGH_CONTEXT_USAGE",
      "message": "Session preloads 25 tools; each preloaded tool adds to the agent context window. Consider keeping the list at or under ~20 tools."
    }
  ]
}