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

readOnlyHint=true already declares the safety profile, so the description goes further by disclosing the underlying API endpoint (GET /v2/tasks), the fact that billing rates are returned, and the workflow dependency on task URLs for timeslip creation. Pagination behavior is left to the schema, which is a minor omission for a read-only list.

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?

Three compact sentences, front-loaded with the purpose, then the dependency, then the endpoint. Every clause conveys something the agent can act on and there is no filler.

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 usefully flags the key returned attribute (billing rates) and the resource path. Combined with 100%-covered input schema and readOnly annotations, an agent has enough to call it correctly; only explicit pagination/return-shape framing is absent.

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%, so all six parameters (page, sort, view, project, per_page, updated_since) are already documented in the schema. The description only echoes the project filter ('optionally for one project') without adding format or behavioral detail beyond it, so the baseline 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 verb and resource ('List project tasks'), adds the notable return attribute ('with their billing rates'), and notes the optional single-project scope. It also ties itself to a downstream sibling (freeagent_create_timeslip) via the task URL, giving some sibling differentiation, though it doesn't contrast with freeagent_list_projects.

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?

'optionally for one project' signals the filtering use case, and 'A task's URL is needed for freeagent_create_timeslip' tells the agent exactly when this call is a prerequisite. No explicit when-not or alternative-listing guidance, but the context is clear.

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