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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description adds value beyond that by disclosing the return shape ('rendered release body with a link to the GitHub release') and the Canton-specific scope, which matter because no output schema exists. It stops short of explaining what happens when the optional repo hint is omitted or how the repo is resolved.

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?

Three short sentences, front-loaded with the action and scope, with the return-value note last. Every sentence carries information and there is no filler.

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 read-only lookup with full schema coverage and no output schema, the description is nearly complete: it scopes the repos, names the required version input, and describes the return content. The remaining gap is the behavior of the optional 'repo' hint when omitted, which an agent may need to call it correctly.

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 the schema already documents both 'repo' (canton, daml, dpm, splice) and 'version' with format examples. The description only restates the repo set, and its naming ('decentralized-canton-sync (Splice)') is slightly looser than the schema's 'splice', so it adds no real semantic value. 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 specific verb and resource ('Fetch the release-notes body for one SDK version'), and names the exact repos in scope, so the agent knows it retrieves a single version's changelog rather than listings. It only implicitly differentiates from siblings such as search_release_notes or get_latest_release, so it falls short of a 5.

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?

Usage is implied: the phrase 'for one SDK version' signals this is the lookup to use when a specific version tag is already known. There is no explicit statement of when to prefer it over search_release_notes, get_latest_release, or get_recent_changes, and no exclusions or prerequisites are given.

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