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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and openWorldHint=false, so the safety profile is covered. The description adds only the fact that the call works with zero arguments; it says nothing about result ordering, recency window, or pagination behavior, which would matter for a 'what's new' feed.

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 tight sentences, front-loaded with the usage trigger and ending with invocation examples. The sequence 'No arguments needed' followed by two example argument shapes is slightly at odds in tone but still informative rather than wasteful.

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, zero-required-parameter feed tool with a fully documented schema and rich annotations, the description gives the agent enough to call it correctly. The absence of any hint about the returned fields or ordering is a minor gap given there is no output schema.

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 type, limit and since are fully documented in the schema and the baseline of 3 applies. The example {"since":"2026-10-20"} reinforces the date filter's format but adds nothing about the type filter or limit semantics.

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 concrete purpose: surfacing what changed recently in AI coding tools, harnesses or apps. The resource scope is specific enough to separate it from catalog lookups like get_tool or search_apps, though it never names a sibling or contrasts with get_tool_trends, which could also answer 'what changed' questions.

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?

'Use when asked what changed recently in AI coding tools, harnesses or apps' gives an explicit triggering condition, and 'No arguments needed' tells the agent it can call immediately. There is no when-not guidance or named alternative for narrower lookups, which keeps it short of a 5.

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