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

Annotations already declare openWorldHint=false and destructiveHint=false; the description adds that the target is a sandbox endpoint, which usefully reinforces that nothing real is touched. It does not explain side effects, that runs are recorded and retrievable via get_run_verdict/list_runs, or anything about repeat-call behavior beyond what the schema says about retryKey.

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 short sentences with no filler, and the core action is front-loaded. The 'Answers: how do I…' construction is a bit informal but still efficiently conveys intent.

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 simple two-optional-param tool with full schema coverage and no output schema, the essentials are present. The missing piece is positioning relative to chargerdojo_run_journey in a 21-tool sibling set, which is exactly the ambiguity an agent is most likely to hit.

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% and both parameters are optional with explicit descriptions, including the retryKey idempotency semantics and the list_journey_templates pointer for templateId. The description adds nothing beyond those, 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?

The description states a specific verb and resource (run an OCPI charging journey) and pins the target to a sandbox endpoint, which differentiates it from most siblings. However, it never names the obvious near-twin chargerdojo_run_journey, so the agent must infer the distinction between sandbox and non-sandbox runs.

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 'Answers: how do I try a journey without an endpoint of my own' line implies the usage context — evaluation without your own OCPI endpoint. But it gives no explicit exclusion (e.g. use run_journey when you do have a target) and names no alternative, leaving the selection decision only partially guided.

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