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

Adds substantial context beyond the annotations: it discloses conditional assignment, conditional column move, that the timer stops any other timer across all workspaces, and that it returns a git branch name. None of this is captured by readOnlyHint=false / destructiveHint=false, and nothing contradicts those hints.

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?

Two front-loaded sentences with no filler; the compound action is stated first and the return value last. The parenthetical 'stopping any other, in any workspace — done says which' is dense but earns its place by flagging a cross-workspace side effect.

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 multi-effect mutation tool this covers the essential behavior, the cross-workspace timer side effect, and the meaningful return value, and an output schema exists to carry structured results. Nothing an agent needs to invoke it correctly is missing.

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 key, note, and timer (including the default). The description references the timer effect but adds no format or edge-case detail beyond the schema, 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?

States a specific composite action (assign, move to in-progress, start timer) on a named resource (an item), and the return value is called out. An agent can distinguish it from start_timer/stop_timer/finish_work without opening any 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?

Usage is implied by the described side effects, and the aside 'done says which' gestures at the finish_work counterpart. However, there is no explicit when-to-use or when-not-to-use guidance versus siblings like start_timer, which performs only the timer portion.

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