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

Annotations already declare readOnly=true, destructive=false, openWorld=true, so the safety profile is covered. The description adds useful workflow behavior: it is a project-scoped lookup that requires a project name sourced from list_projects, and it names the fields returned. It doesn't mention pagination limits, but the schema covers that.

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 compact sentences: purpose plus returned fields first, then the prerequisite and endpoint. No padding, though the raw endpoint path is arguably low-value for an agent selecting the tool.

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?

With no output schema, the description helpfully names the returned fields (id, status, description), and annotations handle safety. Pagination behavior and the distinction from other job-listing tools are left implicit, but nothing essential for a correct call is missing.

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 offset, project_name and number_of_jobs are fully documented in the schema; baseline is 3. The description adds a small hint that project_name should come from click2mail_list_projects, but gives no meaning for offset/number_of_jobs beyond 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?

Clear verb+resource: 'List the mailing jobs of one project', with the returned fields (id, status, description) called out. It doesn't differentiate from sibling click2mail_list_jobs_by_app_signature or click2mail_list_jobs, and the phrase 'this is how to see the account's jobs' is slightly misleading since the scope is one project, not the account.

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?

Gives clear context: pick a project from click2mail_list_projects first, implying this is a follow-up drill-down tool. No explicit exclusion against the alternate job-listing sibling (list_jobs_by_app_signature), 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.