pixera_setup_layer

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

With no annotations, the description carries the full behavioral burden. It usefully discloses that the operation is a mutation, that it will create the layer if absent, and that it refuses protected timelines. It says nothing about permission/auth requirements, idempotency, or what a refusal looks like to the caller, leaving meaningful gaps for a write tool.

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 core action and constraints are front-loaded and the field enumeration is compact. It is dense and slightly run-on, but each clause conveys distinct information with little waste.

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?

An output schema exists, so return values need not be explained, and the description covers most of what an agent needs to call this mutation tool correctly, including the protected-timeline refusal. Missing coverage of the 'create' default behavior and the layer/timeline identifiers keeps it from being fully complete.

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 0% and there are 8 parameters, so the description must compensate. It explains resource_id, model_resource_id (including the '3DModel' resource type), home_screen, render_only_on_home_screen, and crucially supplies enum values for scale_mode that the schema does not constrain. It leaves layer, timeline, and create only implicitly covered.

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 specific verbs ('find or create', 'set') on a named resource (a layer) and enumerates the settable attributes, so the agent knows exactly what the tool operates on. It does not explicitly contrast itself with the read-oriented sibling pixera_get_layer_json, so it stops short of a 5.

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?

Usage is implied by the find-or-create semantics and the 'Refuses protected timelines' constraint, which tells the agent a precondition failure mode exists. However, there is no explicit when-to-use guidance nor any pointer to alternatives such as pixera_create_timeline or get_layer_json for read-only inspection.

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