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

Annotations already declare readOnlyHint=false and destructiveHint=true, so the safety profile is covered. The description adds value beyond that: it discloses patch/partial-update behavior (omitted fields are left untouched) and an authorization requirement (Owner-only). It does not describe the response or side effects of the destructive flag, which keeps it from a 5.

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 short sentences, each carrying distinct information (scope, patch behavior, permission + alternative), with the core purpose front-loaded. Nothing is repeated from the name, title, or schema, 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?

For a 6-parameter mutation tool with full schema coverage, an owner-only constraint, and no output schema, the description covers scope, partial-update behavior, permissions, and the instruction alternative. The main residual gap is any note on what a successful update returns or whether changes are reversible, which the destructiveHint alone does not clarify.

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 schema already documents all six parameters, making 3 the baseline. The description adds the meaningful patch semantic that only supplied fields are modified, but contributes no per-parameter detail (e.g., URL formats for liveUrl/repoUrl) beyond what the schema provides.

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+resource ('Update a project's own details') and explicitly scopes it against the nearest sibling by routing instruction-document changes to update_instruction. It stops short of naming other update_* siblings, but none of those operate on projects, so the risk of confusion is low.

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 real selection guidance: partial-update semantics ('Only the fields you provide change'), a permission prerequisite ('Owner-only'), and an explicit alternative for a related case ('Instruction documents change through update_instruction'). No explicit when-not-to-use, but the alternative routing covers the main ambiguity.

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