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

Annotations already establish that the tool is not read-only and not destructive, so the description's job is to add context. It adds the case-insensitivity behavior for status/budget_type and highlights which budget fields are updateable. It does not mention whether unprovided fields remain unchanged or how partial updates behave, which is relevant for a 17-parameter update tool.

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 sentences with no filler: the first states the action and affected field groups, the second provides a useful input-format exception. The description is appropriately sized and front-loaded.

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 17 parameters, a low 18% schema-description coverage, no output schema, and no mention of update semantics (partial vs. replace) or return type, the description leaves substantial gaps for an agent trying to call this tool correctly. It also lacks guidance on the many sibling update tools, making it incomplete for the tool's complexity.

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 only 18%, and the description names only a subset of parameters (revenue, revenue_ceiling, and the budget categories), adding some meaning. It also notes case-insensitive values for status/budget_type. However, most of the 17 parameters (title, dates, manager_id, customer_id, description, etc.) receive no semantic help from either the schema or the description, so it undercompensates for the low coverage.

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 uses the explicit verb 'Update' with the resource 'project' and enumerates the affected field groups (revenue, revenue_ceiling, and budget categories), making the core function clear. It does not explicitly differentiate from sibling tools like projects_update_material or projects_update_team_member, but the wording 'a project' versus sub-resources is reasonably distinct.

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?

No guidance is provided on when to choose projects_update over the many sibling update tools such as projects_update_billing_milestone or projects_update_material. The only usage hint is that status/budget_type accept case-insensitive values, which is about value formatting, not tool selection.

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