browser_get_local_storage

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

With no annotations, the description carries the behavioral burden. 'Read' communicates a non-mutating operation and 'from the current page' gives scope, but the description does not disclose return format, behavior for missing keys, or origin/security constraints. For a simple getter this is acceptable but not comprehensive.

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 two short sentences with no filler. The primary action is front-loaded, and the optional parameter behavior is explained immediately and clearly.

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, no output schema, and no annotations, the description covers selection and invocation adequately. The only notable gap is the lack of explicit mention of return shape or missing-key behavior, but overall it is sufficiently complete for a simple localStorage reader.

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 description coverage is 100%, and the schema already documents the key parameter exactly as the description does. The description adds no new meaning beyond the schema, so it meets the baseline but does not exceed it.

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 and resource: 'Read localStorage from the current page.' It is immediately distinguishable from sibling browser_set_local_storage because the verb 'Read' directly contrasts with 'set.' The optional-key behavior is also stated precisely.

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 provides clear context: reading from the current page, with 'Pass key for a specific value, or omit for all.' It does not explicitly name alternatives or exclusion criteria, but the read-vs-set distinction is obvious from the sibling set_local_storage tool.

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