compare_packages

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

Annotations already declare readOnly, idempotent, and non-destructive, so the safety profile is covered. The description adds a genuinely useful trait beyond the annotations: partial-failure isolation, meaning one bad package won't drop the rest. It stops short of describing output structure or rate/limit behaviors, so it is good but not rich.

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 short sentences, front-loaded with the core action and cardinality, with the failure-tolerance note second. Every sentence earns its place; nothing is padded.

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?

There is no output schema, so the description should convey what a comparison returns and which attributes are contrasted; it says nothing about that. Combined with 0% parameter description coverage, an agent knows what the tool does but not what it will get back or how to shape the input beyond the schema's structural hints.

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 0%, so the description carries the burden for a nested parameter object with name, version, and ecosystem. The phrase '2 to 5 packages' mirrors minItems/maxItems from the schema rather than adding new meaning, and it does not clarify that version is optional or what ecosystem values mean. Baseline adequacy, but a real gap given zero schema coverage.

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 (compare) and resource (packages) with a clear cardinality constraint of 2 to 5, which distinguishes it from single-package siblings like get_package. However, it never says what dimensions are actually compared (versions, vulnerabilities, licenses, scores), leaving the resource's scope partly underspecified.

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 2-to-5 range implies usage constraints, and naming partial-failure tolerance gives some context. But there is no explicit guidance on when to use this versus calling get_package or get_scorecard individually, and no exclusions or prerequisites are stated.

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