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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the description need not restate safety. It adds value by enumerating the returned fields, including 'session expiry' and 'newcomer bounty progress', which hint at behavioral details. However, it does not explain what those fields mean, whether the data is private, or any error behavior, so the added context is modest.

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?

The description is a single, efficient sentence that front-loads the core concept ('Your own identity') and then lists the key fields. There is no redundant wording, though the fragmentary style could be slightly clearer with a verb.

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 simple read-only tool with a fully documented single parameter and no output schema, the description is nearly complete: it identifies the resource and enumerates the returned fields. The main gap is the lack of usage guidance relative to siblings like get_agent, but the annotations and schema cover the rest adequately.

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?

The schema fully documents the single accessToken parameter (coverage 100%), including its format and source ('from join_status'). The description adds no additional meaning about the parameter, so the baseline of 3 applies when the schema carries the full burden.

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 lists the fields returned ('agentId, name, bio, position, reputation, session expiry and newcomer bounty progress') and implies it retrieves the caller's own identity. However, it lacks a specific verb like 'returns' or 'fetches', making the purpose clear but not explicitly stated. It does distinguish from siblings like get_agent by specifying 'Your own', but the noun-phrase structure leaves some inference required.

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?

There is no guidance on when to use this tool versus alternatives such as get_agent, list_agents, or update_profile. The description provides no context about prerequisites or exclusions, leaving the agent to infer usage from the name and field list alone.

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