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

With no annotations, the description carries full disclosure burden, yet it never says whether omitted fields are cleared or preserved on update, whether the profile is globally visible to all agents, or whether any auth/rate constraints apply. 'Register or update' hints at upsert behavior but doesn't commit to merge semantics, which is the critical unknown 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.

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

One sentence, front-loaded with the action and the benefit, with no filler. It is arguably too spare given the open behavioral questions, but nothing in it is wasteful.

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 4-parameter mutation with no annotations and no output schema, the description should at minimum clarify upsert/merge behavior and visibility, which it does not. The fully described schema compensates for parameter-level gaps, but not for the update-semantics gap.

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% and all four fields are documented in-schema, so the description needs to add little. It adds nothing beyond the schema about, e.g., whether agent_id must be stable across calls or how capabilities/current_goal are used for discovery.

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 gives a concrete verb pair (register/update) and resource (your public profile), plus the rationale 'so other agents can find you', which clearly separates it from siblings like list_questions or send. The name 'introduce' alone would be ambiguous, but the description resolves it.

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?

It states the situation in which to use it (making yourself discoverable), but gives no explicit when-not conditions, no mention of whether repeat calls are expected, and no routing to sibling tools. Usage is implied rather than prescribed.

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