chim_save_api_key

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

With no annotations, the description carries the full burden of behavioral disclosure. It does reveal the side effect of writing to a config file, but it omits critical details such as whether an existing API key is overwritten, whether the config file is created if missing, or any validation/security implications. This is a significant transparency gap for a state-changing 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?

The description is a single, well-structured sentence that is immediately informative. It includes the exact config file path and avoids redundancy or filler, earning a top score for conciseness.

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 tool is relatively simple, and the schema covers all parameters, but the description omits the optional base_url and user_agent parameters and does not explain behavior like file overwriting or return values. For a minimal config-writing tool without annotations or output schema, the description is adequate but not fully complete.

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 provides 100% coverage of all parameters, each with a clear description, so the baseline is 3. The tool description adds no parameter-specific information, but the schema fully documents the API key, base URL, and user agent parameters, making this adequate.

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 primary function (stores the CHIM API key) and specifies the exact resource and location (~/.config/chim-mcp/config.json). This distinguishes it from sibling tools that operate on changes, outages, and retros, making the purpose unambiguous.

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?

No guidance is provided on when to use this tool vs alternatives. It does not mention that it is a prerequisite for using other CHIM tools or that it should be called during setup. The description simply states what it does, leaving usage context implicit at best.

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