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

Annotations already declare destructiveHint=true, so the safety profile is partly covered; the description adds useful context by calling the operation 'additive' and giving the POST endpoint. It still omits what happens on duplicate text or identifier, whether auth or project permissions are required, and what the call returns. Note the mild tension between the description's 'additive' framing and destructiveHint=true.

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 the action front-loaded and zero filler. The trailing API-route sentence is marginally redundant for an agent but is compact and cheap.

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 create/mutation tool with no output schema, the description leaves out the result shape (a created string id is typically needed for follow-up calls) and any duplicate-handling semantics. Annotations cover the destructive signal, but the description should say more about post-call state.

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 100% with 7 well-documented parameters, so the schema carries parameter meaning on its own. The description adds no field-level detail (e.g., identifier uniqueness, isHidden/maxLength effects), 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 ('Adds a source string to a file') plus the exact API route, so the operation is unambiguous. It implies the distinction from crowdin_add_translation by specifying 'source string', but never names a sibling tool 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 when-to-use guidance, no prerequisites (e.g., the file must already exist), and no mention of alternatives such as crowdin_add_translation or how to look up fileId via crowdin_list_files. Usage is only inferable from the verb.

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