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ExoCubeYT

OpenWA MCP Server

by ExoCubeYT

stop_session

Terminate a running WhatsApp session gracefully to free up resources and avoid connection issues.

Instructions

Stop a running WhatsApp session gracefully

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
sessionIdYesID of the session to stop

Implementation Reference

  • The handler function for the 'stop_session' tool. It receives a 'sessionId' parameter, makes a POST request to the OpenWA API at /sessions/{sessionId}/stop to stop the session, and returns the API response as text.
    async ({ sessionId }) => {
      const data = await openwaClient({ method: "POST", path: `/sessions/${sessionId}/stop` });
      return { content: [{ type: "text" as const, text: JSON.stringify(data, null, 2) }] };
    }
  • Input schema for the 'stop_session' tool. Defines a required 'sessionId' string parameter describing the ID of the session to stop.
    {
      description: "Stop a running WhatsApp session gracefully",
      inputSchema: {
        sessionId: z.string().describe("ID of the session to stop"),
      },
  • Registration of the 'stop_session' tool using server.registerTool(), with its schema and handler function. Part of the registerSessionTools() export.
    server.registerTool(
      "stop_session",
      {
        description: "Stop a running WhatsApp session gracefully",
        inputSchema: {
          sessionId: z.string().describe("ID of the session to stop"),
        },
      },
      async ({ sessionId }) => {
        const data = await openwaClient({ method: "POST", path: `/sessions/${sessionId}/stop` });
        return { content: [{ type: "text" as const, text: JSON.stringify(data, null, 2) }] };
      }
    );
  • src/index.ts:15-15 (registration)
    The session tools (including 'stop_session') are registered on the MCP server by calling registerSessionTools(server) in the main entry point.
    registerSessionTools(server);
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description should disclose behavioral traits. 'Gracefully' hints at clean shutdown but lacks details on side effects, error handling, or prerequisites (e.g., session must be running).

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

A single, concise sentence. No wasted words, but could include more behavioral context without losing brevity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Adequate for a simple tool with one parameter and no output schema, but lacks behavioral details that would help the agent use it correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the description adds no extra meaning beyond 'ID of the session to stop'. Baseline 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb ('Stop') and resource ('running WhatsApp session'), clearly distinguishing from sibling tools like 'delete_session' and 'start_session'.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this tool over alternatives (e.g., 'delete_session'). The agent must infer context from the name alone.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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