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

Annotations already declare readOnlyHint=true and destructiveHint=false, so safety is covered; the description adds the return envelope { count, next_skip, items } and the paging contract, which is real behavioral value. It does not mention rate limits or whether openWorldHint=true implies unbounded result sets, but the paging contract mitigates 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?

Three tight sentences, pagination and return shape front-loaded ahead of the filter notes. The opening field list ('name, client, status, dates, budget, billing rate') is telegraphic and slightly ambiguous as to whether those are fields or arguments.

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 8 optional parameters, no output schema, and nested filter objects, the description supplies exactly what the schema cannot: the response envelope, the paging loop, and the id-for-single-record shortcut. 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 description coverage is 100%, so the baseline is 3. The description's parameter notes (id for a single record, next_skip for paging, query for MongoDB-style filtering) largely restate what the schema already documents, adding no format or precedence guidance beyond it.

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 names the resource (projects) and enumerates the fields it carries, plus the concrete endpoint 'GET /projects', which makes the read/list operation unambiguous against siblings like plutio_create_project. The verb is only implicit (the title supplies 'List'), so it stops short of a full verb+resource statement.

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?

'Pass id to read one record' and 'Filter with exact-match fields or a MongoDB-style query' clearly describe the available usage modes, and the pagination instruction ('pass next_skip as skip') is actionable. It stops short of saying when to prefer filters over query, or when to use this tool versus searching other resources.

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