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

Annotations already declare readOnly=false, idempotent=true, destructive=false and openWorld=false, so the safety profile is covered. The description adds only the scope detail that the plan lives in "the person's account"; it says nothing about title collisions, whether the previous name is recoverable via undo_change, or what a successful response contains.

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?

One short, front-loaded sentence with no wasted clauses. It is efficient but borders on under-specification rather than tight writing.

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 two-parameter mutation with annotations covering safety and idempotency and no output schema, the description is minimally adequate. Gaps remain around the effect on the previous name, error conditions, and how this differs from edit_project.

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 50%: project_id is well documented in the schema but title carries no description anywhere. The description does not compensate by explaining that title is the new name to apply, its length/format constraints, or uniqueness rules — the single most important unknown for the caller is left unexplained.

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?

Names a specific verb and resource ("Changes the name of a plan"), so an agent knows exactly what operation this is. It does not, however, distinguish itself from the sibling edit_project, which plausibly also modifies a plan's name, and it drifts between "plan" (description/title) and "project" (tool name/schema), leaving a minor terminology ambiguity.

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?

There is no when-to-use guidance at all: nothing says to prefer this over edit_project for renames, nor any precondition such as existing ownership of the plan. The agent must infer the routing decision entirely from the tool name.

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