Compare Candidates

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

With no annotations at all, the description carries the full behavioral burden, yet the only trait disclosed is that it emits a comparison table. It says nothing about whether identifiers are fetched live (latency/rate limits), what happens with invalid or mixed repo/model IDs, or how many items are allowed.

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?

One sentence, front-loaded with the verb and resource, with zero filler. Appropriately sized for a one-parameter tool that already has an output schema.

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 presence of an output schema means return values need no explanation, and with only one required parameter the definition is nearly sufficient for correct invocation. The remaining gaps are behavioral edge cases (invalid IDs, mixed identifier kinds) rather than blocking omissions.

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% and the single `ids` array has no description, so the phrase 'repository or model identifiers' is doing real work by telling the agent what the strings represent (and that mixing kinds is apparently allowed). However, it omits the expected format ('owner/repo' vs 'org/model'), ordering, and any size limit.

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 states a specific verb (compare) and a concrete resource (repository or model identifiers) plus the output shape (a structured comparison table). It is clearly distinguishable from siblings like search_github_repos or get_repo_health, though it never names a sibling to route away from.

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?

There is no guidance on when to use this versus search_github_repos or search_hf_models, nor any stated preconditions such as needing identifiers discovered elsewhere first. The only hint is the word 'compare,' which is purpose rather than usage instruction.

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