pin_firefox_tab

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

The description mentions verification but does not disclose potential side effects, such as changes to tab state, error handling when the tab is not found or already pinned, or any mutation of the browser session. Without annotations, the agent is left unaware of these behaviors, which is a significant gap.

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 extremely concise and direct, using a single sentence that conveys the action and the verification step. There is no unnecessary verbosity or redundancy, and it is well-structured for quick comprehension.

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?

Given the tool's complexity (multiple selector forms) and lack of an output schema, the description is insufficient. It does not mention return values, error scenarios (e.g., ambiguous or missing selector), or any edge cases. The 'verify' step is vague and does not clarify what is returned or how verification is performed, leaving the agent without essential context.

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 adds the phrase 'exactly identified' which reinforces the uniqueness requirement of the selector, but the schema already provides detailed descriptions for each selector variant (e.g., exact URL match, ignore fragment). The description does not add further meaning beyond what the schema covers, so it provides minimal added value.

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 clearly states the action (pin) and the requirement of exact identification. It also mentions verification, which adds clarity. However, it could be more explicit about what 'pin' entails (e.g., making the tab non-closable or pinning its position), but the core purpose is understandable.

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 provides no guidance on when to use this tool versus alternatives like unpin or other tab management tools. It lacks context about typical use cases or scenarios where this tool is preferred, making it hard for an agent to decide when to invoke it.

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