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

No annotations are supplied, so the description carries the full burden; it does disclose one genuinely important behavior, that saved edits do not take effect until export_subtitle is run with regenerate=true. It says nothing about whether updates merge with or replace existing review rows, whether partial row objects are allowed, permission requirements, or failure modes for bad row indices.

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, front-loaded with the payload shape, then the workflow guidance, with no filler. The field enumeration is dense but earns its place given the opaque schema.

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 mutation tool with no annotations, an opaque array schema, and a missing storage_path explanation, the description covers the row payload and the read-then-write-then-export cycle but leaves key mechanics unaddressed. An output schema exists, so return values need not be described, which offsets some of the 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 description coverage is 0% and the 'updates' parameter is an untyped array of free-form objects, so the description's row field list (row_index, translation, approved, rationale) is doing real compensating work that the schema cannot. However, the second required parameter, storage_path, is never explained and no field types or requiredness within a row are given.

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 ('Save') and resource ('subtitle review edits') and enumerates the row fields being persisted (row_index, translation, approved, rationale). It is clearly distinguishable from the read counterpart get_subtitle_review and from export_subtitle, though it never explicitly contrasts itself with them.

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?

Gives a concrete precondition ('Use row indices returned by get_subtitle_review') and a concrete follow-up ('Export with export_subtitle(regenerate=true) after editing to apply the changes'), which routes the agent through the correct workflow. It stops short of stating when not to use this tool or what happens if rows are omitted.

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