set_local_storage

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

With no annotations, the description carries the full burden. It only mentions the set operation and a value-format tip. It does not disclose overwriting behavior, persistence across sessions, tab scoping, or any side effects, which is a significant gap for a mutating tool.

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 action, and no wasted words. The JSON.stringify tip adds practical value without bloating the description.

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 simple localStorage set operation, the description is minimally viable, but it lacks any mention of return behavior, validation, or error conditions. Given no output schema or annotations, more completeness could be expected.

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 100% with descriptions for key, value, and tabId. The description adds value by advising JSON.stringify for objects, which clarifies the value parameter beyond the schema's simple 'Storage 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 tool sets a localStorage key-value pair, using the specific verb 'Set' and naming the resource (localStorage). It is unambiguous and distinct from sibling tools like get_local_storage or clear_local_storage.

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 for localStorage operations but does not explicitly state when to use this tool versus alternatives like set_cookie or clear_local_storage. The JSON.stringify tip provides a usage hint but no when-not-to-use guidance.

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