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get_thread

Retrieve a specific email thread by its ID. Optionally include the parsed HTML body for detailed inspection.

Instructions

Get a specific thread by ID

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idYesThe ID of the thread to retrieve
includeBodyHtmlNoWhether to include the parsed HTML in the return for each body, excluded by default because they can be excessively large

Implementation Reference

  • The 'get_thread' tool handler function. It takes 'id' (required) and 'includeBodyHtml' (optional) parameters, calls gmail.users.threads.get with format='full', then processes each message's payload via processMessagePart() and returns the formatted response.
    server.tool("get_thread",
      "Get a specific thread by ID",
      {
        id: z.string().describe("The ID of the thread to retrieve"),
        includeBodyHtml: z.boolean().optional().describe("Whether to include the parsed HTML in the return for each body, excluded by default because they can be excessively large")
      },
      async (params) => {
        return handleTool(config, async (gmail: gmail_v1.Gmail) => {
          const { data } = await gmail.users.threads.get({ userId: 'me', id: params.id, format: 'full' })
    
          if (data.messages) {
            data.messages = data.messages.map(message => {
              if (message.payload) {
                message.payload = processMessagePart(message.payload, params.includeBodyHtml)
              }
              return message
            })
          }
    
          return formatResponse(data)
        })
      }
    )
  • The input schema for 'get_thread' tool: requires 'id' (string, the thread ID), and optional 'includeBodyHtml' (boolean) to control whether HTML body content is included in the response.
    server.tool("get_thread",
      "Get a specific thread by ID",
      {
        id: z.string().describe("The ID of the thread to retrieve"),
        includeBodyHtml: z.boolean().optional().describe("Whether to include the parsed HTML in the return for each body, excluded by default because they can be excessively large")
      },
  • src/index.ts:729-751 (registration)
    The tool is registered on the MCP server via server.tool('get_thread', ...) at line 729. It's registered within the createServer function that sets up all Gmail MCP tools.
    server.tool("get_thread",
      "Get a specific thread by ID",
      {
        id: z.string().describe("The ID of the thread to retrieve"),
        includeBodyHtml: z.boolean().optional().describe("Whether to include the parsed HTML in the return for each body, excluded by default because they can be excessively large")
      },
      async (params) => {
        return handleTool(config, async (gmail: gmail_v1.Gmail) => {
          const { data } = await gmail.users.threads.get({ userId: 'me', id: params.id, format: 'full' })
    
          if (data.messages) {
            data.messages = data.messages.map(message => {
              if (message.payload) {
                message.payload = processMessagePart(message.payload, params.includeBodyHtml)
              }
              return message
            })
          }
    
          return formatResponse(data)
        })
      }
    )
Behavior2/5

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

No annotations provided, so the description alone must disclose behavior. It only states the purpose, omitting what the response contains, side effects, or limitations.

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

Conciseness5/5

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

Single sentence, no fluff. Every word contributes to the purpose.

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

Completeness2/5

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

No output schema and the description does not explain the return value (e.g., thread structure). In a server with many sibling tools, this lack of detail may hinder correct usage.

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?

Input schema has 100% coverage for both parameters. The description does not add any additional meaning beyond what the schema provides.

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 clearly states the action (get), resource (thread), and method (by ID). It distinguishes from sibling tools like get_message or get_draft.

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 versus alternatives such as list_threads or modify_thread. The description is purely declarative without context.

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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