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

readOnlyHint=true already declares a safe read, and the description adds the concrete behavioral payload: it reveals the project and environment the key belongs to. The 'GET /me' note reinforces it is a pure read with no side effects. It stops short of noting auth-failure behavior, but adds real value beyond the annotation.

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 tightly packed clauses plus an endpoint reference, with the identity/ids payoff front-loaded. No filler or restatement of the tool title.

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 zero-param, no-output-schema tool, the description covers what is returned (project, environment) and why it matters (ids needed by other tools). The only omission is failure/auth-requirement behavior, which is minor given the readOnly annotation.

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?

Zero parameters, so there is nothing for the description to disambiguate; it correctly implies the only input is the pre-configured x-api-key. Baseline 4 for a param-free tool.

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+resource: it returns the project and environment that the configured x-api-key belongs to. Clearly distinguishable from every sibling (which act on contacts, webhooks, responses, etc.). An agent knows exactly what this tool produces.

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?

Explicitly frames itself as 'the fastest way to find the workspace and environment ids the other tools need,' which tells the agent when to reach for it. It does not name an alternative tool or state exclusions, but for a zero-arg identity lookup there is little ambiguity to resolve.

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