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

Annotations already cover read-only, idempotent, non-destructive and closed-world semantics, so the safety profile is settled. The description adds real behavioral content beyond that: the result is a summary card, and it is capped at 12 jobs, which warns the agent about truncation. It does not say how to retrieve the remainder or whether the cap is silent, leaving a modest gap.

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 tightly packed sentences: usage trigger first, then the exact return contents, then the exclusion. No filler, no repetition of the title, and every clause carries information.

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 one-parameter read tool with an output schema and full annotations, the description is effectively complete; the output schema means return shape need not be explained. The only shortfall is the unaddressed truncation at 12 jobs, where an agent is not told what to do when the project has more.

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 description coverage is 100% and there is a single required projectId whose meaning is already self-evident from the schema. The description adds no further meaning about the id format or source, 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 specific resource (one Croncool project) and enumerates exactly what the card contains: project name/creation time, workflow hosting status, and up to 12 jobs with schedule, origin and last run status. The closing exclusion ('Not for a job's run history') separates it from get_job_runs and get_job without needing the 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?

Gives an explicit trigger ('when someone wants a quick overview or dashboard of one Croncool project') plus a negative boundary against run-history tools. It stops short of naming the sibling to use instead (get_job_runs) or pointing to list_projects for cross-project views, so it is clear but not fully routing.

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