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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds genuinely new behavioral context: explicit size limits, formula-injection protection, and that the result is 'evidence-bounded' with a canonical web tool URL. It does not quantify the limits, which keeps it from a 5.

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, zero filler, and the core purpose is front-loaded ahead of the secondary detail about return payload. Slightly loose phrasing ('evidence-bounded result') but well within acceptable length.

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?

An output schema exists, so explaining return values is not required, yet the description still notes the returned URL. For a single-parameter, non-destructive conversion tool this is largely complete; only the parameter format and concrete limits are underspecified.

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?

One parameter with 0% schema description coverage, so the description must carry meaning. It conveys the expected shape ('small flat JSON export') and hints at limits, but never documents the 'json' parameter by name, its accepted syntax, or how the 12000-character cap manifests to the caller.

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 and resource ('Convert a small flat JSON export into a downloadable spreadsheet') and scopes it with 'small flat', which implicitly separates it from the schema-heavy siblings. It does not explicitly name csv_deduplicator or any other sibling, so it stops short of full differentiation.

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 statement of when to use this tool versus alternatives, nor any prerequisites or exclusions. The only usage signal is the fragment 'for launch exports' in the title, which is implied context rather than guidance.

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