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

Adds substantial context beyond the annotations: persistence across later sessions and other assistants, replace-not-duplicate semantics, that nothing is treated as measured until the developer confirms on their project page, and that secrets/personal details are refused rather than stored. These are real behavioral traits the agent can't infer from readOnlyHint/destructiveHint alone.

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?

Front-loaded with the core action and dense with distinct facts; each sentence carries information. The trailing 'This one writes.' is largely redundant with readOnlyHint=false, a minor waste in an otherwise efficient block.

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 exists, yet the description covers the confirmation workflow, refusal policy, persistence and idempotency, giving the agent everything needed to call it correctly. Nothing material is missing for a two-parameter write tool.

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%, so both parameters are already documented in the schema, including the 240-character limit and example. The description reinforces 'in their words' but adds no format or syntax detail beyond what the schema provides, so the baseline of 3 applies.

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 concrete verb and resource ('Saves what the developer wants kept true ... as a promise on the project'), plus the distinguishing behavior that restating replaces rather than duplicates. This separates it from sibling listing tools like boosthis_promises without opening any schema.

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?

Conveys when this is the right tool ('what the developer wants kept true from now on') and the replacement condition for repeat use. However it never explicitly names an alternative (e.g. boosthis_promises for reading existing promises), so it stops short of full when/when-not guidance.

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