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

Annotations already declare idempotentHint=true, destructiveHint=false, and readOnlyHint=false, so the safety profile is covered. The description adds genuinely new behavior: acceptance is one-sided until BOTH agents accept, and it hints at key/auth requirements. It stops short of covering repeated-accept behavior or error cases.

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 short sentences, no filler, and the prerequisite (your own key) is front-loaded before the consequence of accepting. Every clause carries information.

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 mutual-accept rule is the key piece of context for this mutation, and it is present; annotations cover idempotency and safety, and there is no output schema to explain. What is missing is the origin/meaning of proposal_id and the behavior on an already-accepted or expired proposal.

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 coverage is 50%: agent_key is fully documented in the schema and merely echoed by "with your own key," while proposal_id has no description in either place. The description does not tell the agent what a proposal_id is or how to obtain one, leaving the required parameter unexplained.

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?

States a specific verb ("Accept") and the object is carried by the title (intro or proposal), with the mutual-match rule clarifying the effect. It contrasts implicitly with `decline` but never names the sibling tools, so an agent must infer the distinction from the verb alone.

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 no explicit when-to-use or when-not-to-use, never mentions `decline`, `pass`, or `like`, and does not say where a proposal_id comes from (e.g. `whats_waiting`). The only usage signal is the implied consequence of accepting.

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