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

Annotations already mark it non-read-only and destructive, but the description goes further by explaining the precise side effects: choosing activates the LIVING JOURNEY, changes future trip_status responses to a requirements checklist, announces the choice in the trip conversation, and is reversible by choosing again. No contradiction with 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?

Three dense sentences, each earning its place. The core action and parameter source are front-loaded, followed by reversibility, downstream effects, and conversation visibility. No filler or repetition.

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?

The description covers the action, side effects, reversibility, and downstream trip_status behavior, which is substantial. However, without an output schema it never states what choose_path itself returns, and the grant parameter remains entirely unexplained, leaving a notable gap for the agent.

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 0%, so the description carries the burden of explaining parameters. It clearly explains path_id as coming from trip_status options[].id, and trip_id is implied by 'the trip's own conversation', but grant is never mentioned at all. With one of three required parameters undocumented, compensation is incomplete.

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 verb, resource, and data provenance: 'Choose one of a delivered trip's researched options' with 'path id from trip_status options[].id'. This makes it unmistakably different from read-only status or planning tools like trip_status or plan_trip.

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?

Provides clear context for when to use the tool: after a trip's options have been researched and are visible in trip_status. It also clarifies the consequence (activating the LIVING JOURNEY) and reversibility, though it does not explicitly name alternatives or exclusion cases.

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