simulate_ultra_route

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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered by structured data. The description adds context about scenario generation and output content, but it does not disclose how edge cases, invalid GPX, or default penalty selection are handled, which would be richer behavioral detail beyond the 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?

Two sentences with no filler and a clear front-loaded action. The first sentence communicates both inputs and scenario variants; the second states the output. Every word contributes to the selection and invocation decision.

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 single-purpose simulation tool with annotations already covering safety, the description gives enough high-level context to select and call the tool: inputs, scenario types, and output object kinds. It is not fully complete because it does not describe how the three scenario levels differ or the shape/units of the returned sector checkpoints and finish times, but the lack of an output schema makes that a modest mismatch rather than a fatal omission.

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?

The description maps the high-level factors—GPX route, departure time, flat speed, planned stops, climbing penalty—to the parameter domain, which adds some relational meaning. However, it does not explain formatting rules, units for every input, how segmentDistanceKm affects checkpoints, or what the climbing penalty default is; with 50% schema description coverage, the meager parameter explanation carries only partial weight.

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 states a concrete operation—build optimistic, probable, and conservative timing scenarios—and names the key resource and outputs (sector checkpoints, finish times). It is easy to distinguish from most sibling tools such as list_workouts or auth checkers, but it does not explicitly separate itself from route-analysis/planning siblings like analyze_gpx_route or plan_operational_route, leaving some differentiation to inference.

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 gives no when-to-use or when-not-to-use guidance and names no alternatives. It implies a timing-simulation use case, but in a sibling set containing route analysis and route planning tools, an agent must infer that this tool is meant specifically for simulating optimistic, probable, and conservative timing rather than those other tasks.

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