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

Annotations already establish readOnlyHint=true and openWorldHint=false, so safety is covered. The description still earns credit by adding the no-auth requirement and enumerating the returned story tree (body paragraphs, feature card, image, source citations), which matters because there is no output schema.

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?

Front-loads the verb and resource, then adds identification format and return contents in a tight sequence. The trailing 'Args: { slug: string, story_id: string }' is pure redundancy against a 100%-documented schema and is the only sentence that does not earn 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?

With no output schema, the description usefully describes what is returned, plus auth and parameter sourcing. It stops short of noting failure behavior (e.g. unknown slug or story id), which would be the remaining gap for a single-resource fetch.

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 the baseline is 3. The description goes beyond the schema by explaining that story_id is a kebab-case slug and giving concrete examples ('grok-build', 'shai-hulud-2'), which reduces the chance of passing a numeric id.

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+resource ('Fetch one story') and the exact key pair that identifies it, which cleanly separates it from ic_signal_get_latest and ic_signal_list_issues. It does not explicitly name those siblings, so it falls just short of the top band.

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 schema descriptions point to ic_signal_list_issues and ic_signal_get_issue as the source of the two required keys, so an agent can infer the retrieval chain. However, the description itself never says when to prefer this over get_issue or get_latest, and gives no exclusions.

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