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

Annotations already declare readOnlyHint=false, destructiveHint=true, idempotentHint=true and openWorldHint, so the safety profile is covered elsewhere. The description adds nothing beyond them: it does not say what gets overwritten, whether null/omitted fields leave values unchanged or clear them, or whether the change is reversible — notable gaps given destructiveHint=true.

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?

A single short sentence with the resource and mutable fields front-loaded and zero redundancy. It is efficient, though its brevity tips into under-specification rather than tight completeness.

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?

An output schema exists and annotations cover the safety profile, so the description needn't explain return values. However, for a destructive mutation whose two optional params default to null, the agent is left without guidance on whether omitting a field preserves or clears it.

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 ID format (PR-123-456-789) and the name/description fields are already documented. The description only restates the two updatable fields and adds no semantics about partial updates or null handling, 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?

The description names a specific verb and resource ("Update a project") and scopes it to name and description, which distinguishes it from create_project, delete_project and get_project in the sibling list. It is clear but does not explicitly point to those alternatives.

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?

Usage is only implied: an agent can infer this is for modifying an existing project's name or description. There is no statement about when to prefer it over create_project or update_node, no prerequisites (project_id must exist), and no note on which fields are mutable.

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