storage_snapshot

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

No annotations are provided, so the description carries the full burden. It clearly discloses what data is captured and that it is stored in a named slot. It does not detail whether an existing slot is overwritten or whether snapshots persist, but these are minor gaps for a capture primitive.

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?

One sentence with no waste: action, payload, destination, and purpose all appear in order. The relationship to storage_diff is included without adding clutter.

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 tool with one optional parameter and no output schema, the description conveys what is captured, where it goes, and why it exists. The only real gap is that it does not describe the return value or what the agent should expect after invoking it, but the storage_diff workflow makes that less critical.

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 schema has no descriptions for the 'name' parameter, but the description's 'named slot' gives that parameter meaningful semantics: the slot identifier. The schema already supplies the default value, so the agent can infer that omitted names use 'default'. Slightly more explicit parameter guidance would be even better, but the description compensates well.

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 ('Capture'), the exact resources (cookies + localStorage + sessionStorage + URL), and the destination (a named slot). It also names the companion tool storage_diff, making it easy to distinguish from sibling storage/snapshot tools.

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 phrase 'so storage_diff can tell you exactly what an action changed' provides a clear pre/post-action workflow context and names the relevant companion tool. It does not explicitly say 'call before an action' or mention when not to use it, but the intended usage is strongly implied.

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