set_fx_preset

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

No annotations are provided, so the description carries the full burden, and it does disclose two useful traits: exact-name matching and a post-load readback verification, plus a plugin-UI limitation. It is silent on mutation side effects, permissions, and failure behavior when the preset name doesn't exist.

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?

Two tightly packed sentences, with the core action front-loaded and the caveat/alternative following. No filler.

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 10-parameter mutation tool with no annotations and no output schema, the description covers the core action and its alternative but leaves targeting/selection and error conditions unexplained. The readback note partially substitutes for an output schema.

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 50% and 10 parameters exist, so the description should compensate more than it does. It clarifies the required 'name' semantics (must be exact match to a host preset name), but says nothing about the targeting parameters (track, fx_guid, fx_index, fx_scope, use_selected_track).

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+resource: loading a named REAPER host preset with a readback check. It also names a contrasting sibling (add_fx_chain for saved chains), though it doesn't explicitly contrast with get_fx_preset, which is the obvious inverse operation in the sibling list.

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 an explicit exclusion: proprietary preset files may require plugin UI, and saved chains should go through add_fx_chain instead. This is real routing guidance, though it stops short of describing prerequisites (e.g. FX must already exist on the target track).

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