Claim Chrome tab

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

With no annotations, the description carries the full burden of behavioral disclosure. It adds context about advisory default and exclusive lease behavior with TTL, which is valuable. However, it does not mention side effects, failure modes (e.g., what happens if the tab is already exclusively claimed), or the non-destructive nature of claiming. The description gives partial insight but leaves important operational details unspecified.

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 sentences, front-loaded with the primary purpose and immediately followed by the most important usage decision (advisory vs exclusive). No filler or redundancy. Every word contributes to 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?

For a claim tool with 4 params and no output schema, the description covers the critical decision point (exclusive vs advisory) and TTL semantics. It does not explain return values or error conditions, but given the simplicity and the presence of sibling tools like list_tabs and release_tab, this is largely sufficient. A minor gap is the lack of information about contention or failure when an exclusive claim is already held.

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 coverage is 75% (tabId lacks a description). The description adds semantic meaning beyond the schema by explaining the advisory/exclusive distinction and linking exclusive=true with ttlMs for lease semantics. It also implies that tabId must refer to an 'allowed' tab, which is a constraint not stated in the schema. This meaningfully helps an agent select correct parameter values.

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 clear verb ('claim') and resource ('Chrome tab') with a specific scope ('for this browser-control session'). It distinguishes itself from siblings like release_tab and list_tabs by defining the claim action precisely. The wording leaves no ambiguity about what the tool does.

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?

Provides explicit guidance on when to use exclusive mode versus advisory claims, mentioning 'fail-fast tab leases across parallel agents'. It does not explicitly name alternative tools or exclusions, but the context of advisory vs exclusive gives actionable decision-making. Slight gap: doesn't state when to prefer this over release_tab, but that is inferred from the verb.

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