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

Goes well beyond the annotations by disclosing the internal read-merge-write behavior against a PUT that is a full replace, the permission prerequisite, the empty-string clearing convention, and the return payload. This is exactly the kind of implementation detail an agent cannot infer from idempotentHint/destructiveHint alone.

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?

Four short sentences, front-loaded with the merge semantics and auth requirement before the edge case. The opening 'Update a project' restates the name/title, but the rest is dense with substance and 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?

No output schema exists, yet the description states what is returned, and it covers permissions, merge behavior, and the clearing convention. For a 3-parameter mutation tool, an agent has everything needed to invoke it correctly.

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 the baseline is 3; the description adds value by explaining the omit-vs-empty-string distinction for the optional fields, which is the main semantic trap here. It could say more about what happens when both name and description are omitted, but the key ambiguity is resolved.

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 ('Update a project') and clarifies it is a partial update, which separates it from full-replace or specialized setters like set_project_budget. It doesn't explicitly differentiate itself from those specialized siblings, but the scope is unambiguous.

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 concrete operational context: only passed fields change, role requirement (Administrator or ProjectManager), and how to clear the description. It lacks an explicit statement of when to prefer this tool over sibling setters such as set_project_budget or set_project_guests.

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