tool_back

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

The description is transparent about the basic action but does not disclose any additional behavioral traits. For a simple tool with no annotations, this is adequate but could mention that it goes back one step in history or that it may fail if no history exists.

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 a single sentence that is front-loaded and to the point. Every word is meaningful, with no redundancy.

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 simplicity (no parameters, no output schema), the description is complete enough for its context. It could be slightly improved by noting that it only goes back one step, but it is not necessary for correctness.

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 tool has zero parameters, and the schema coverage is 100%. The description does not need to add parameter information. Baseline for 0 parameters is 4, so this score is appropriate.

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 uses a specific verb ('navigate') and resource ('browser history'), making the tool's purpose immediately understandable. It distinguishes itself from its sibling tools like 'tool_forward' which does the opposite.

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 implies usage (when you want to go back in history) but provides no explicit guidance on when to use this tool over alternatives like 'tool_navigate' or 'tool_forward'. No exclusion criteria or prerequisites are mentioned.

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