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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=false, so the write-but-non-destructive safety profile is covered. The description adds only the 'deletes not supported' constraint; it says nothing about duplicate setup names, required vehicle existence, or side effects on related logs/sessions.

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 zero padding and the primary action front-loaded. It is efficient but so terse that it omits information an agent needs, which limits the score.

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 7-parameter mutation tool with nested setupData and only 43% schema coverage, this is thin. The output schema removes the need to describe return values, but missing parameter meaning, prerequisites, and sibling routing leave real gaps.

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 only 43%, so the description carries the burden of clarifying parameters, yet it adds nothing. It does not explain setupName, vehicleId, dataLogIds, or influencedSessionId, leaving half the parameters undocumented in both places.

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+scope: 'Saves a new TuneWorks setup for a vehicle.' The word 'new' cleanly separates it from update_setup, archive_setup, and list_setups in the sibling list, though those siblings are not named explicitly.

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?

There is no guidance on when to use this versus update_setup (for existing setups) or archive_setup (for lifecycle changes). 'Deletes are not supported' hints at a limitation but does not route the agent to any alternative, and no prerequisites are stated.

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