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

The description is consistent with the readOnlyHint annotation, and it notes that no API key is needed, which is useful transparency. However, it does not detail what the tool returns in terms of structure or how the data might be used, leaving some ambiguity about its side effects or output.

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 repetitive, mentioning 'Fetch' twice and re-listing 'schema_url' and 'schema_hash' in the second half. This redundancy makes it less concise than it could be, though it remains relatively short overall.

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 description does not fully clarify what the tool's response contains (e.g., a JSON object with specific fields) or what the agent is expected to do with the fetched data beyond 'validating the contract.' It leaves the operational context incomplete.

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 tool has zero parameters, so there is nothing to explain. The schema description coverage is effectively 100% (no parameters exist), and the description adds no extra parameter-related info, so it stays at the baseline score.

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 indicates that the tool fetches an AgentContractV1 descriptor and hosted_runtime facts, but it also mentions validation, which muddles the primary purpose. It is not immediately clear whether the tool's main role is to retrieve data or to perform a validation check.

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 phrase 'call this now' is more of a directive than a use-case guideline. While 'to validate the platform contract before acting' gives some context, it does not clearly specify when to use this tool versus alternatives, nor does it outline any prerequisites or conditions.

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