storage

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

With no annotations, the description carries the full burden. It says 'read/write' but does not flag that set/remove mutate persistent state or that clear wipes all storage destructively, nor does it describe permissions or reversibility. The parenthetical '(or sessionStorage)' hints at a storage-type toggle but never explains how it is selected.

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?

A single front-loaded sentence with zero filler, stating the resource and the operation set first. It is efficient, though the extreme terseness is closer to under-specification than to disciplined concision.

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?

No output schema, no annotations, and a 5-parameter mutating tool with 20% schema coverage leaves the definition far from complete. An agent cannot determine per-op argument requirements, the meaning of 'session', or the destructive scope of 'clear' from this description.

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 only 20% (just tabId), so the description must compensate. It adds almost nothing: the op enumeration duplicates the schema enum, and the sessionStorage reference does not explain the 'session' boolean. It never states that set requires value, that get/remove require key, or what happens if key is omitted on clear.

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?

States a specific resource (localStorage/sessionStorage) and the full set of operations, so the agent immediately knows this is a browser storage accessor. It distinguishes itself implicitly from get_cookies, but never names or contrasts any sibling tool explicitly.

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 gives no when-to-use guidance, no prerequisites, and no routing to alternatives. An agent must infer that this is the tool for storage reads/writes versus get_cookies or the snapshot tools.

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