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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false, covering the safety profile. The description adds the return format (title, link, published, summary) and the optional keyword filter, which are useful but do not cover error conditions or edge cases. Given the annotations, this additional context is sufficient but not rich.

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 short sentences with zero fluff. The core action is front-loaded, the return format is explicit, and the optional filter is mentioned last. Every sentence adds value and the description is immediately scannable.

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 tool with three parameters and no output schema, the description covers how to obtain the feed id, what is returned, and the optional filter. It does not mention the limit parameter, but that is fully documented in the schema. Given the low complexity and rich annotations, nothing critical is missing for correct invocation.

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 all three parameters are already documented. The description adds the phrase 'Optionally filter items by keyword' which maps to the query parameter but provides no extra syntax or behavior details beyond the schema. Baseline 3 is appropriate when schema does the heavy lifting.

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 verb ('Read'), a specific resource ('curated law & courts feed'), and explicit output behavior ('Returns normalized items...'), with a clear pointer to the sibling tool list_feeds for obtaining the feed id. This distinguishes it from feed-resource alternatives like fetch_feed or list_feeds.

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?

The description establishes clear context: read a feed by its id, and the id comes from list_feeds. It implies the prerequisite step of listing feeds first. However, it does not explicitly mention when not to use this tool or name alternative tools (e.g., search_within, fetch_feed), so some inference is left to the agent.

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