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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds genuinely new behavioral context — the deprecation status and the shape of the analysis produced (first-shipper attribution, lag in days, trend insights) — but says nothing about result size, pagination, or coverage limits across tracked tools.

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 sentences with the deprecation notice correctly front-loaded before any capability detail. The trailing feature enumeration ('hooks, checkpoints, ...') is slightly padded but earns its place by illustrating cross-tool scope.

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 must carry return-value meaning, and it does name the three outputs (first shipper, follower lag in days, trend insights). It does not describe result structure or how many features are typically returned, leaving a modest gap for a single-optional-param read tool.

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 the single parameter already documents itself with examples ('subagents', 'mcp', 'planning'). The description only adds that filtering is optional, which is already implied by the empty required list, so 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?

The description states a specific resource and the exact question answered: which tool shipped each notable cross-tool feature first, follower lag in days, and copying-trend insights. The parenthetical feature examples (MCP support, subagents, planning mode) make the scope concrete and distinguish it from generic release-listing siblings.

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?

It opens with an explicit deprecation and a named replacement sibling ('Deprecated: use feature_adoption'), which is unambiguous routing. It stops short of explaining how feature_adoption differs or when this legacy tool might still be the right call, so guidance is strong but not fully comparative.

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