set_local_storage

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

Describes core behavior (write, optionally clear, return {success}) and a reload caveat. With no annotations, description carries full burden. Minor omissions: does not clarify overwrite vs merge behavior for existing keys, nor specify allowed value types in entries.

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 concise sentences. First sentence states action; second provides use context and a caveat. No redundant information, well front-loaded.

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 4 parameters and no output schema or annotations, description covers purpose, usage, and a behavioral note. Lacks explicit overwrite semantics and session context, but is sufficient for most testing use cases.

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 parameter descriptions already present. Description adds marginal value: mentions return value and use case, but does not elaborate on parameter details beyond what schema provides. Baseline adjusted to 3.

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?

Description clearly states 'Write key/value entries to a session page's localStorage (or sessionStorage)' with a specific verb and resource. It distinguishes from sibling get_local_storage by focusing on write behavior.

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?

Explicitly says 'Use to seed client state... reload if the app reads storage only at load time', providing clear context for when to use. Lacks explicit exclusions or references to alternative tools like set_cookies, but the guidance is adequate for typical testing scenarios.

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