Link service

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

Annotations indicate a write operation (readOnlyHint false) and non-idempotent behavior (idempotentHint false). The description adds context by stating the API endpoint (POST) and the effect, but it does not disclose error conditions (e.g., if the link already exists) or whether the operation is reversible. It provides some transparency but lacks full detail.

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 relatively concise with two sentences and an API call reference. However, the first sentence 'Link service.' is redundant given the title and second sentence. It is efficient but contains a minor repetition, preventing a perfect score.

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 simple linking operation with two parameters and no output schema, the description covers the primary purpose and effect. However, it omits details such as prerequisites (e.g., service must exist), error handling, or confirmation of the operation. The description is adequate but not fully comprehensive.

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 description coverage is 100% (both parameters have descriptions). The tool description does not add any additional meaning beyond what the schema provides; it merely references the parameters without giving examples, constraints, or further semantics. Baseline score of 3 is appropriate as the description offers no extra value over the 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?

The description clearly states the verb 'Link', the resources involved (service to environment group), and the specific effect: access to environment variables and secret files. It also distinguishes the tool from its sibling 'render_unlink_service_from_env_group' and other linking operations by specifying the action and consequences.

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 explains the outcome of using the tool (service gains access to env vars/secret files) but does not provide explicit guidance on when to use it versus alternatives, nor does it mention prerequisites or exclusions. While the purpose is clear, the lack of usage criteria or differentiation from similar tools limits the score.

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