Google News Homepage

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

Annotations already establish the read-only, idempotent, non-destructive, open-world profile. The description adds a trait annotations cannot express: Google rate-limits this endpoint, so rapid repeats may be blocked and recovery requires waiting or switching tools. That is materially useful operational 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?

Two sentences, purpose front-loaded, no filler. The second sentence is dedicated to the one non-obvious operational risk, so every sentence earns its place.

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?

The output schema covers return values and annotations cover safety, so those are not needed here. The remaining gap is the unexplained locale parameters, which matter for correct invocation of a region-varying feed but are absent from both the description and the 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?

All three locale parameters (gl, hl, ceid) have 0% schema description coverage, and the description says nothing about them. For a region/language-sensitive endpoint, the agent gets no explanation of what gl, hl, or ceid control or how they interact, so the description fails to compensate for the coverage gap.

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 ('Scrape Google News homepage RSS') plus the payload ('top headlines right now'), which cleanly distinguishes it from the sibling google_news_search by scope (homepage feed vs. query). It does not name that sibling explicitly, so differentiation is implicit rather than explicit.

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?

Provides a conditional fallback ('when the result is blocked, wait or switch to an RSS-based tool'), which is genuine usage guidance. However it never states when to prefer this over google_news_search, and the 'RSS-based tool' alternative is left unnamed, so routing remains inferential.

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