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

Annotations already declare readOnlyHint=false, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds real context beyond that: the schedule-level effect of pausing and the exact response shape ({feedId, action, status, feedStatus, enabled:false}), which matters since there is no output schema. It could note that the state is reversible via resume_feed, but the added value is solid.

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 verb, resource, and effect, then usage, then return shape, then parameter sourcing — a sensible priority order in a single compact block. The inline return-value enumeration is dense but earns its place given no output schema exists.

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 simple two-parameter state-change tool with annotations covering idempotency and safety, this covers purpose, trigger, parameter sourcing, and return value. The only real gap is the unexplained purpose of project_id and the absence of any note on error behavior (e.g., pausing an already-paused feed), which idempotentHint largely mitigates.

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 0%, so the description must carry parameter meaning. It does explain feed_id's provenance (from list_feeds / create_feed), which is genuinely useful. However, 'project_id OPTIONAL' only restates the schema's non-required status without saying what project_id scopes or why one would pass it, leaving half the parameters under-explained.

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 verb and resource ('Pause (disable) a feed') plus the concrete effect ('stops being exported/submitted on schedule'). This clearly separates it from siblings like resume_feed, delete_feed, and submit_feed without needing to open 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?

Explicitly gives the trigger condition: 'Use this when the user wants a feed to stop exporting.' It also tells the agent where feed_id comes from (list_feeds / create_feed). It stops short of naming the alternative (resume_feed) or warning when not to use it, so it is clear but not exhaustive.

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