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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It mentions optional upload and waiting, but omits resumption semantics, side effects, authentication needs, idempotency, or what happens to an existing assembly when resuming.

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?

The description is a single front-loaded sentence with no filler. It is concise and easy to parse, though it is arguably too sparse for a 10-parameter tool; the conciseness itself is good, but it sacrifices necessary detail.

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?

Given the high complexity (10 parameters, nested objects, no annotations, 0% schema coverage), the description is far from complete. It does not explain how to resume via assembly_url, how to provide instructions, what upload_behavior values mean, or how timeout/concurrency parameters interact. The output schema helps with return values but not with invocation context.

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 description only vaguely alludes to 'uploading files' and 'waiting for completion.' It does not explain assembly_url, instructions, fields, upload_behavior, wait_timeout_ms, expected_uploads, upload_chunk_size, upload_concurrency, or wait_for_completion, leaving most parameters semantically opaque.

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 uses a specific verb-resource pair ('Create or resume an Assembly') and adds optional behaviors ('uploading files and waiting for completion'). It clearly identifies the tool's core action and distinguishes it from read-only siblings like transloadit_get_assembly_status, though it does not explicitly contrast with transloadit_wait_for_assembly.

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 explicit guidance on when to use this tool versus alternatives. The phrase 'optionally uploading files and waiting for completion' hints at behavioral choices, but it does not explain when to prefer this tool over transloadit_wait_for_assembly or when resumption is appropriate.

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