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

Disclosure of mutation (updating note) aligns with readOnlyHint=false. IdempotentHint=true is consistent. Description adds the null-clearing behavior and allowed operations beyond annotations.

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 core purpose. Every sentence adds value without redundancy.

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 the tool's simplicity (update a single field) and absence of output schema, the description is complete enough. No need for return value details.

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 baseline 3. Description adds value by explaining the note can be a string or null (clear) and clarifying savedJobId is the saved job entry ID, not the job ID.

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 explicitly states 'Update the note on a saved job' with specific use cases (add context, track status, reminders). It clearly distinguishes from siblings like add_application_note (application notes) and save_job/unsave_job.

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?

Provides explicit scenarios for use (add context, track status, reminders) and notes the null clearing behavior. Though no explicit when-not-to-use, the context is sufficient for an agent to decide.

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