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

The annotations already declare destructiveHint=true and readOnlyHint=false. The description adds valuable behavioral context: patch-style merge semantics and that instructions cannot be updated here. It does not cover permissions, error behavior, or response shape, but those gaps are less critical given the safety annotations.

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?

The description is two tight sentences with no filler. It front-loads the core action and then immediately adds the key merge and restriction details, both of which earn their place.

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 simple update tool with full schema coverage, safety annotations, and no output schema, the description covers the essential scope and merge behavior. It could mention that project_id is required or describe error cases, but those are minor given the structured fields already available.

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 parameter meaning is already fully documented. The description restates the updatable fields and adds merge semantics, but it does not add param-specific syntax or constraints beyond what the schema provides. Baseline 3 is appropriate.

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's name, description or tags. This clearly distinguishes it from siblings like tm_create_project and tm_update_folder. It also signals the update scope, so an agent can identify the tool without opening the schema.

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?

It states that fields are merged and only passed fields change, which tells the agent how to invoke it. It also clarifies that Project & Org Instructions remain UI-managed, giving a useful when-not boundary. However, it does not explicitly name alternative tools or elaborate on when to choose this over other update operations.

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