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MrNewDelhi

Mailosaur MCP

by MrNewDelhi

mailosaur_servers_update

Update a Mailosaur server's name by specifying its server ID and the desired new name.

Instructions

Update a Mailosaur server.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idYesServer ID.
nameYes

Implementation Reference

  • The handler function for the mailosaur_servers_update tool. It takes 'id' and 'name' parameters, calls mailosaur.servers.update(), and returns the result via the response helper.
    async ({ id, name }) => {
      const result = await mailosaur.servers.update(id, { name });
      return response(result);
    }
  • Zod schema defining the input parameters: 'id' (string, server ID) and 'name' (string) for the mailosaur_servers_update tool.
    {
      id: z.string().describe("Server ID."),
      name: z.string()
    },
  • src/index.ts:298-309 (registration)
    Registration of the 'mailosaur_servers_update' tool with the MCP server, including name, description, schema, and handler.
    server.tool(
      "mailosaur_servers_update",
      "Update a Mailosaur server.",
      {
        id: z.string().describe("Server ID."),
        name: z.string()
      },
      async ({ id, name }) => {
        const result = await mailosaur.servers.update(id, { name });
        return response(result);
      }
    );
  • Helper function that wraps a value into the MCP response format with a text content block containing JSON-stringified output.
    function response(value: unknown) {
      return {
        content: [
          {
            type: "text" as const,
            text: JSON.stringify(value, null, 2)
          }
        ]
      };
    }
Behavior2/5

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

The description lacks any behavioral details beyond the fact that it performs an update. There is no mention of whether other fields are affected, if the update is partial or complete, authentication requirements, rate limits, or side effects. This is insufficient for a mutation tool.

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

Conciseness3/5

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

The description is extremely concise with one short sentence, but it achieves this by omitting critical information. It is not overly verbose, but the brevity sacrifices usefulness.

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?

Given no annotations, no output schema, and a minimal description, the tool definition is far from complete. Important details like return values, error handling, and the nature of the update (e.g., merge vs. replace) are missing.

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

Parameters2/5

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

The input schema has two parameters, with only 'id' having a description. The description itself adds no parameter-level details. With only 50% schema description coverage, the description does not compensate, leaving the 'name' parameter entirely undocumented.

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

Purpose4/5

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

The description clearly states the action (update) and resource (Mailosaur server), making it distinct from non-update operations like create or delete. However, it does not differentiate from other update-like tools that might exist elsewhere.

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 is provided on when to use this tool versus alternatives such as create, delete, or get. There is no mention of prerequisites, typical use cases, or situations to avoid.

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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