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

The annotations already establish that this is a non-destructive, idempotent write. The description adds useful behavioral context by clarifying that it records owner progress only and does not submit anything externally, though it does not describe permission requirements or whether arbitrary status transitions are accepted.

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 dense but front-loaded with the core action and mostly earns its length through status definitions and the important no-external-submission caveat. It could be split into two sentences for readability, but there is little wasted text.

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 write tool with annotations covering safety and idempotency, the description gives enough context to select the tool and supply the conditional arguments correctly. It does not explain return behavior, but no output schema exists and the key non-side-effect is already stated.

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 57%, so the description must compensate, and it does: it explains the status enum meanings, names the source of opportunity_id, and states that listing_url is for verified and skip_reason for skipped. It does not explain usage of notes, site_id, or user_goal, but two of those are already described in the schema.

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 specific verb and resource: recording the owner's progress on one growth opportunity. It clearly separates this tool from list_growth_opportunities by pointing there for ids and from submission-style tools by saying it submits nothing anywhere.

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?

It explains the intended use context and maps each status value to a concrete owner action, including conditional arguments for verified and skipped. It does not explicitly compare against nearby tools such as update_marketing_idea, but the selection context is otherwise clear.

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