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

Adds real behavior beyond the annotations: a 2 MB payload cap, the header-row requirement, and duplicate-skipping semantics. It does not say whether bad rows abort the whole import or what the response reports, which is the main remaining gap for a mutation tool.

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 tight sentences with the operation and constraints front-loaded and no filler. Slightly dense phrasing ('the text of a CSV file with a header row (2 MB at most)') but nothing extraneous.

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?

With only two fully documented parameters and no output schema, the definition covers what an agent needs to build a valid call. It leaves unclear what the response contains (counts imported vs skipped) and whether partial failures roll back, which is a modest but real gap.

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%, so the baseline is 3. The description adds a size limit and reiterates the header row, and narrows source_id to manual sources, but gives no format detail beyond the schema's own example.

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 ('Imports reviews') plus the input form (CSV text) and the target ('a manual source'). This implicitly distinguishes it from add_review (single review) and sync_review_source (connected sources), though no sibling is 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?

The mention of 'a manual source' implies the caller must first resolve a source via list_review_sources, but the description never says when to use this versus add_review or sync_review_source, nor what preconditions the source must meet.

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