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

No annotations are provided, so the description carries the behavioral disclosure burden. The only behavioral claim is 'Key discarded,' which is vague because no parameter named 'key' exists in the schema; it also does not disclose output format, side effects, or whether anything is returned.

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?

The description is short and the main purpose is front-loaded, which is efficient. However, the second sentence 'Key discarded' is unclear and does not help an agent invoke the tool, making the description feel under-specified rather than well-structured.

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 tool with nine parameters, no output schema, and no annotations, this description is far too thin. An agent cannot determine which parameter to pass, what the tool returns, or how it differs from sibling shape-checking tools.

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 input schema already documents all nine parameters. The description adds no parameter-level meaning and introduces an ambiguous 'key' term that does not map cleanly to any property in the schema.

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 and resource: check the shape of a Jira issue key. This distinguishes it from other shape-checking siblings like github-repo-shape or domain-shape. However, it does not say what a positive or negative result looks like, and no parameter named 'key' appears in the 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?

The phrase 'Jira issue key' implies the tool is for validating Jira issue key shapes, so basic usage context is present. But the description gives no explicit when-to-use versus when-not-to-use guidance and names no alternatives or exclusions.

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