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

Annotations declare a non-read-only, non-destructive, non-open-world mutation, so the safety profile is covered. The description adds real behavioral context beyond that: moving a relation away from dependencies/blockedTasks 'unblocks the waiting task with notifications, as in the web app.' It does not state permissions, reversibility, or return shape.

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?

Front-loaded with purpose, and the long role enumeration earns its space because each value needs disambiguation. It is a single dense paragraph, though; splitting the role list into a structured form would improve scannability.

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 5-parameter mutation tool with no output schema, the description covers role semantics, create-vs-update behavior, and side effects. It omits what the tool returns and any error/permission context, which an agent calling a write operation would benefit from.

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 baseline is 3, but the description goes well beyond the schema by defining directional semantics for each role ('dependencies - the current task waits for the other; blockedTasks - the other waits for it') and by explaining bug-specific meanings of foundDuring/regressionOf. This meaning is not available from the raw enum.

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 first sentence gives a specific verb and resource: 'Creates or changes a relation between two tasks or bugs.' It is immediately distinguishable from the sibling task_relation_delete, and the body clarifies it is an upsert (create when absent, mutate when present).

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?

The description explains the create-vs-update condition ('Without a relation of that role one is created... an existing one gets newRole and desc') and the meaning of every role value, which effectively tells an agent when to pick each. It stops short of naming alternatives or exclusions (e.g. routing to task_relation_delete or explaining prerequisites).

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