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

Adds real behavior beyond the annotations: source/signature/checksum files are excluded, checksum companions are linked, ties are surfaced as ambiguity rather than silently resolved, private repos and auth are unsupported, and the call costs $0.003 USDC. Annotations only give generic safety hints, so this carries substantial extra context.

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?

A single front-loaded paragraph where each clause carries information: exclusion rules, ambiguity policy, auth scope, and price. It is dense but not padded, though the pricing/auth clauses could be split for scannability.

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?

With no output schema, the description should convey what comes back; it does describe the resolved asset, linked checksum companions, and the ambiguity outcome. Missing detail on the actual response shape or error/not-found behavior keeps it from a 5.

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%, so os/arch/release/repository/allow_prerelease are already documented. The phrase 'normalized OS/architecture target' lightly reinforces the enum semantics, but adds little beyond what the schema states. Baseline 3 applies.

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 precise verb+resource: 'Resolve a public GitHub release into the most plausible downloadable asset for a normalized OS/architecture target.' No sibling (api_discover, package_preflight, etc.) does GitHub release asset resolution, so the tool is unambiguously distinguishable without opening the schema.

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 implies usage (pick a release asset for a target OS/arch) but never states when to use this versus alternatives, nor any preconditions beyond 'public repositories only, no auth.' That constraint is useful but is an exclusion, not routing guidance.

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