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

Annotations already cover read-only, open-world and non-destructive semantics, so the description correctly spends its words elsewhere: it itemizes exactly what comes back, which matters since no output schema exists. It omits failure behavior (unknown id) and any auth or rate caveats.

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, no filler. The return-content enumeration is front-loaded and every listed field earns its place because no output schema carries that information; the final sentence doubles as an actionable instruction.

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 and one fully described parameter, the description does the heavy lifting on return contents and does it well. The remaining gap is behavioral edge cases — what happens with a bad id or a nonexistent story — which an agent would still have to discover by calling.

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 'id' parameter is fully documented there, including the id-slug variant, so the description is not required to compensate. It adds nothing about the id, which is the correct baseline-3 posture.

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 — exactly one verified Oncast story — and enumerates its contents (summary, fact-check verdict, sources, host commentary, timestamps, URLs). The singularity plus the sibling names latest_stories/search_stories make the single-record vs. list distinction obvious without opening a schema.

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 only implied: the reader infers this is the fetch-by-id tool used after a search or listing surfaces an id. No sibling is named and no when-not-to-use guidance is given, though the closing instruction 'Cite the story URL and the sources' gives a downstream behavioral cue.

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