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

The sentence 'Key discarded' provides one meaningful behavioral trait, and it is consistent with the schema's repeated 'discarded after' notes. But with no annotations and no output schema, the description still carries the burden of explaining result format, error behavior, validation semantics, and side effects, none of which is covered.

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 two lines are front-loaded and free of filler, so the structure is efficient. Still, it is too terse for the task: a single sentence of usage mapping between the Jira key and the applicable parameter would be more valuable and would still remain concise.

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 nine parameters, no annotations, no output schema, and a description that never identifies the relevant parameter or return semantics, the tool definition leaves an agent unable to invoke it correctly. The schema's entirely per-parameter descriptions help, but the orchestration-level knowledge needed is missing.

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 high (baseline 3), but the tool description does not map the 'Jira issue key' concept to any parameter. The descriptions for ref, url, query, etc. never mention Jira, so an agent cannot tell which field holds the key; the description adds no semantic linkage and creates a likely mismatch.

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 names a specific verb and resource ('check a Jira issue key shape') and is distinct from sibling shape-checkers such as github-repo-shape and domain-shape. However, the clarity is undermined because none of the nine schema parameters is identifiable as a Jira key, so the stated purpose is not easily actionable from the full definition.

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 gives no guidance about when to use this tool versus sibling validation tools. It does not exclude other tools, does not describe the conditions that favor this tool, and does not indicate which of the nine input fields should contain the key being inspected.

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