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

Annotations already declare readOnly/idempotent/non-destructive, and the description goes well beyond them: it enumerates the three finding categories (missing, unused, placeholder-valued) and states the privacy-relevant output constraint 'Returns keys only, never values'. That is exactly the extra context an agent needs before deciding whether to surface results.

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?

Three sentences, front-loaded with the comparison semantics, then usage triggers, then the return contract. No filler and nothing buried.

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 one-parameter read-only audit with no output schema, the description covers what it does, when to run it, and what comes back (keys only, grouped into three finding types). The remaining gap is the meaning of the 'id' argument, which is not addressed anywhere.

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 0% for the single required parameter 'id', and the description never explains what the id identifies (deployment? project?) or its accepted format. The phrase 'on the deployment' only implies it indirectly, leaving the one parameter largely undocumented across both description and schema.

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 and comparison ('Compare the environment variables SET on the deployment with the ones the code actually reads'), which is clearly distinct from the sibling env_list/env_set/env_delete family. An agent can tell this is a diagnostic/audit operation rather than a CRUD call on env vars.

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?

Gives two concrete triggering situations: right after writing code that needs configuration, and when an app crashes on boot for no visible reason. That is strong positive guidance, though it names no exclusions or explicit alternative tools for related tasks.

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