Set Fill Light Position (Spherical Coordinates)

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

With no annotations, the description carries full burden. It discloses that only azimuth/elevation change and distance is preserved, plus coordinate system definitions. It lacks mention of side effects, permissions, or whether the fill light must exist, but overall adds useful behavioral context.

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 clear and efficiently explains the core behavior. However, the long list of direction names could be shortened or referenced without full enumeration. It remains organized but slightly verbose.

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 simple 2-parameter setter with no output schema or annotations, the description adequately covers input semantics and key behavioral notes. It could mention that the tool overrides previous values, but overall it is sufficiently complete for an agent.

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% with detailed descriptions for both parameters. The description adds examples of direction names but largely repeats schema info. Since schema already explains meaning, the description's extra value is marginal, warranting baseline 3.

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 clearly states it sets the fill light position using spherical coordinates, specifically azimuth and elevation, and preserves the current distance. This distinguishes it from siblings like set_fill_light_distance and other light positioning tools.

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?

The description does not provide explicit guidance on when to use this tool vs alternatives. It mentions preserving distance but does not compare with other fill light tools like move, nudge, or rotate, leaving the agent without clear usage context.

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