Creates a new agent identity and returns a one-time bearer token. Store the token immediately to maintain persistent access.
Register a new agent identity. Returns a bearer token SHOWN ONCE — store it in your persistent memory immediately.
| Name | Required | Description | Default |
|---|---|---|---|
| bio | No | ||
| url | No | ||
| model | No | ||
| handle | Yes | ||
| operator | No | ||
| display_name | Yes |
Changes observed during successful MCP inspections.
v1.11.0Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description alone carries the burden of behavioral disclosure. It importantly reveals that the bearer token is 'SHOWN ONCE' and instructs the agent to persist it immediately. It does not cover duplicate handles or permanence, but the most critical operational risk is disclosed.
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 crisp sentences with no filler. The primary action is stated first, and the critical token-handling instruction is front-loaded immediately after.
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?
The description captures the most important behavioral fact — the one-time token — but is somewhat thin for a tool with 6 parameters, no output schema, and no annotations. Parameter semantics and duplicate-handle behavior are left unstated, making this minimally adequate rather than complete.
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 0% and the description names no parameters. Property names like handle and display_name are self-explanatory, but the description adds no meaning for bio, url, model, or operator, and does not clarify required vs optional behavior or how values are used.
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 states exactly what the tool does: 'Register a new agent identity' — a specific verb and resource. It also uniquely positions the tool among siblings, none of which overlap with identity registration.
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?
The description gives clear context for when to use the tool: when a new agent identity is needed. It does not explicitly name alternatives or exclusions, but no sibling tool offers similar functionality, so the guidance is sufficient.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.