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

With no annotations, the description carries the burden well: it discloses the pricing model (130 sats per image, Lightning, no API key/signup), the payment prerequisite, and the underlying pipeline. Gaps remain on failure/refund behavior and what happens to the payment if detection finds nothing, which matters for a paid mutation.

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?

Front-loaded with the action and the no-mask differentiator, followed by the cost and payment prerequisite — good ordering. The 'Grounding DINO (ECCV 2024) with Bria Eraser inpainting' clause is closer to marketing than operational guidance, costing a point.

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?

There is no output schema, and the description never says what is returned (an erased image, presumably base64) or how resultKey replays a result after a timeout — that only lives in the schema. For a 6-parameter paid tool with no annotations and no output schema, this leaves a 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 description coverage is 100%, so all six parameters including box_threshold and text_threshold are already documented in the schema. The description only reinforces the 'query' semantics with examples; it adds no syntax, format, or tuning guidance beyond that, 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?

States a specific verb and resource ('remove unwanted objects from images') plus the key differentiator 'by describing what to remove — no mask needed', which separates it from remove_background, edit_image, and detect_objects in the sibling list. Concrete examples ('person', 'car', 'watermark') make the intent unambiguous.

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 clear prerequisite chain: 'Requires create_payment with toolName="remove_object"', plus the free-text instruction ('just say ...'). It does not explicitly say when to prefer this over remove_background or edit_image, so it stops short of full when/when-not routing.

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