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

With no annotations, the description carries the full burden, and it does disclose a meaningful trait: mutual consent ('Contacts are shared only after both say yes') and private matching. It omits other behavioral facts an agent needs, such as what happens on success, whether matching is synchronous, and any auth/error behavior beyond the `key` param.

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, front-loaded with the core action and zero filler. The consent caveat is placed last, appropriately, though the phrasing is slightly compressed ('a factory, a maker, another agent').

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 3-param tool with no annotations and no output schema, the description covers the action and consent model but leaves the required `need` parameter and the return/confirmation behavior unexplained. It is adequate but incomplete for correct invocation.

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 only 33% (only `key` is documented). The description compensates for `to` by explaining it as an agent id from a thread and its empty-case meaning, but the required `need` parameter is never explained. This is partial compensation, so a baseline 3 fits.

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 uses a specific verb+resource ('Ask ce-net to introduce you...') and clarifies the matching model ('a factory, a maker, another agent'). It is clearly distinct from read-oriented siblings like intros, though it never names intro_answer or intros explicitly to sharpen the boundary.

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 gives a real conditional for the `to` parameter ('Give `to`... or leave it empty and ce-net matches privately'), which is useful usage guidance. However, it never states when to pick introduce_me over siblings such as intro_answer or intros, leaving the routing to inference.

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