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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false. The sentence "It never changes them" simply restates readOnlyHint and adds no new behavioral context such as auth requirements, error behavior, or result shape. With the safety profile fully covered by structured fields, the description contributes nothing behavioral.

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 short sentences, with the purpose front-loaded ahead of the safety note. The second sentence is largely redundant with the annotations, but the overall definition is tight and easy to scan.

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, non-destructive read of one resource with a single required parameter and no output schema, the definition is minimally sufficient. It nevertheless leaves the run_id semantics and the notion of "prioritised" (ordering, count, structure of fixes) unexplained.

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?

There is one parameter (run_id) with 0% schema description coverage, so the schema explains nothing about it. The description alludes to "your measurement" but never states that run_id identifies the run/measurement, its format, or where to obtain it. 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?

The description states a specific verb (read) and resource (prioritised fixes attached to your measurement), so an agent knows exactly what comes back. It does not name or contrast with any sibling tool, but the resource is distinctive enough to avoid confusion with get_results or get_receipts.

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 this to read..." implies the context of use (inspecting the fixes for a given measurement) but names no alternatives and gives no exclusions or prerequisites. Adequate for a simple single-purpose read tool, but no routing guidance versus the many sibling get_* tools.

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