Toggle a source effect

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

Description adds behavior beyond annotations: omitting 'enabled' toggles, errors list configured effects, and the tool returns the new state. Annotations only state readOnlyHint=false and destructiveHint=false, so this contextualizes the mutation and error handling without contradicting them.

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 sentences, front-loaded with purpose, and no filler. The second and third sentences add crucial usage and behavioral details in minimal words, making this extremely concise while remaining informative.

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 high schema coverage and no output schema, the description adds return state and error behavior, which are essential. It does not explicitly repeat parameter defaults or source_id guidance, but the schema covers those. Overall complete for a moderate single-purpose tool.

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 already covers all 5 parameters (100% coverage). Description adds an example for the effect parameter and reinforces that 'enabled' can be omitted to toggle, though the schema also says 'Omit to toggle.' The error-listing detail adds semantic value for effect values.

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?

Description clearly states 'Enable, disable, or toggle an effect already configured on a source' with an example ('shader-style filters like a black-and-white look'), distinguishing it from sibling tools like set_source_effects. The phrase 'already configured' emphasizes it acts on existing effects, not adding new ones.

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?

Provides clear context: 'already configured' and 'Only effects the streamer already applied can be toggled' indicate when to use. Also explains toggle behavior via 'Omit enabled to toggle.' However, it does not explicitly name alternative tools or exclusions, so it falls short of full guidance.

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