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

Annotations already declare openWorldHint=true, idempotentHint=false, and readOnlyHint=false; the description adds the key consequence — a NEW job is created and processing begins — plus that the call is asynchronous and returns a mediaId for tracking. It doesn't mention cost/credits, auth or permission requirements, or what happens on duplicate submissions beyond the 'NEW' emphasis and the non-idempotent hint.

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?

Three tight sentences: purpose and input types first, the exclusion/routing second, the return value third. Every sentence carries information and nothing is repeated from the title.

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 no output schema, the description correctly fills the gap by naming the return value (mediaId) and its use for tracking and retrieving results. The only shortfall is not pointing at the specific sibling tools (check_job_status, get_analysis_results) that consume that ID.

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% and both parameters are fully described in the schema, so the baseline applies. The description roughly restates the mediaType enum (video, audio, image, document) and clarifies the URL may be a video platform link, but adds no format or edge-case guidance beyond what the schema already states.

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 ('Start a NEW Echosaw analysis job') and resource ('publicly accessible media or document URL'), enumerates accepted input types, and explicitly contrasts with a named sibling (echosaw_download_media). An agent can distinguish this entry-point tool from fetch/lookup tools without opening a schema.

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?

Explicitly frames the tool as an entry point that creates and begins processing, and contrasts it with echosaw_download_media for previously analyzed media. It doesn't name echosaw_check_job_status or echosaw_get_analysis_results as the follow-up step for the returned job ID, leaving part of the workflow to inference.

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