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

Annotations already declare readOnly, idempotent, non-destructive, closed-world, so the safety bar is covered. The description adds value by disclosing result ordering, the date-window behavior, and the tool's replacement status relative to older siblings. It stays silent on truncation/pagination behavior, which the cursor parameter documents but the description never hints at.

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 tight sentences with the resource and ordering front-loaded, followed by the migration and date-window note and the defaults. No filler, and every clause carries information an agent would otherwise have to infer.

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?

An output schema exists and all eight optional parameters are fully documented, so return values and per-field meaning are not the description's burden. What remains is the routing story: the description covers the two predecessor tools but not the boundary with get_release or whats_changed_since, leaving a small gap for a tool in a dense sibling set.

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 100% and every parameter carries a substantive description, including the detail-level ladder and the max_tokens estimate formula. The description's 'Default channel=stable, detail=brief' merely restates what the schema already declares, so it adds no new parameter meaning. 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 resource and ordering ('Newest releases (newest first) across all or selected tools'), which tells an agent exactly what comes back and in what order. It also positions itself relative to siblings by naming latest_releases and release_history as predecessors, so the agent can pick it without opening other schemas.

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?

Explicitly says it is the successor to latest_releases and release_history and that since/until produce a date window, which is real routing guidance. It does not address adjacent siblings like get_release, get_breaking_changes, or whats_changed_since, so the when-not-to-use side is incomplete.

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