mu_registerStart MU agent registration. Emails a 6-digit verification code to the address. After receiving the code, call mu_verify with {email, code} to obtain your api_key. No authentication required for this call.
| Name | Required | Description | Default |
|---|---|---|---|
| Yes | Email address to register; the 6-digit code is sent here. | ||
| agent_name | No | Optional human-readable agent name. |
Changes observed during successful MCP inspections.
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Discloses that a 6-digit verification code is emailed and that no authentication is needed. With no annotations, this covers key behavioral aspects, though additional details (e.g., idempotency, rate limits) are absent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two sentences with no wasted words. The action is front-loaded, and the flow is concisely described.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a registration initiation tool with no output schema, the description adequately covers the complete flow, next steps, and authentication requirements.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so the baseline is 3. The description does not add significant meaning beyond what the schema already provides for the two parameters.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the action (start MU agent registration) and the resource (email address). It distinguishes itself from the sibling mu_verify by outlining the two-step registration flow.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Explicitly instructs to call mu_verify after receiving the code, and notes that no authentication is required. This provides clear when-to-use and next steps.
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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