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

With no annotations provided, the description carries the full burden. 'Key discarded' is a useful disclosure that the input key is not retained or returned, which is genuinely informative. But the description does not state whether the tool returns a boolean, an error, or a shape result, nor whether any external/network validation is involved.

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 very concise: two short sentences with the purpose front-loaded and no filler. Every sentence adds a distinct fact: what it checks and that the key is discarded. A minimal example of a valid Jira key shape would improve it, but for its length it is 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?

The definition is incomplete for confident invocation: it does not specify the actual input parameter for the Jira key, what the valid shape is, or what the return value means. The noisy input schema with many unrelated properties and the absence of an output schema or annotations make this insufficient for an agent to use reliably.

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?

The description references a 'key', but the visible input schema properties are ref, url, city, feed, host, json, and path — none of which clearly maps to a Jira issue key. Several properties are even marked as 'discarded', which suggests they are irrelevant, yet the description provides no mapping from 'key' to a schema parameter. This leaves invocation ambiguous.

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 'Check' and a clear resource, 'Jira issue key shape', which distinguishes it from sibling shape-checkers by domain. The phrase 'Key discarded' also clarifies that this is a validation-only operation, not a retrieval. However, it does not specify what input parameter carries the key or what the expected output is.

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 name and description imply the use case: when an agent needs to validate whether a string is shaped like a Jira issue key. However, there is no explicit guidance about when NOT to use it or which sibling tool to prefer, and the relationship to tools like github-repo-shape or wiki-title-ok is unaddressed.

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