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

With annotations indicating readOnlyHint=false, the description adds meaningful behavioral detail: it discloses a side effect ('set the key as NANMESH_AGENT_KEY env var for reviewing and posting') and implies a state change (activation). This goes beyond the raw annotation without contradicting it.

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 four sentences, each earning its place: it opens with the core purpose, then provides sequencing, input expectations, success behavior, and next steps. No fluff or repetition, and the most critical information is front-loaded.

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?

Despite 10 parameters and an output schema, the description covers the full workflow: why to use it, when in the sequence, what the user provides, what to do on success, and what to do next. The output schema handles return values, so no more description is needed.

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 100%, and parameter descriptions are thorough (e.g., agent_key, agent_id, challenge_id). The description adds minimal extra parameter context beyond restating that the key starts with 'nmk_live_' and references the challenge step. It does not compensate for any gaps, but none exist.

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 clearly states the tool's function: 'Activate a setup key that a human generated from the NaN Mesh dashboard.' It uses a specific verb ('activate') and resource ('setup key'), and distinguishes from siblings by positioning it as 'STEP 2 after nanmesh.agent.challenge.'

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 provides strong usage context: it explains this is the second step after a specific prior tool, notes the input format ('starts with nmk_live_'), and gives a next action ('run the search -> get -> problems read loop'). It lacks explicit 'when not to use' or alternatives, but the step-based guidance is clear enough.

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