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bvandevliet

Betaflight MCP

by bvandevliet

set_serialrx_inverted

Invert the serial RX signal to fix receiver compatibility issues on certain flight controller designs.

Instructions

Set serialrx_inverted: Invert the serial RX signal. Required for some receivers on certain FC designs. [UINT8, default: OFF]

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
valueYesValue for serialrx_inverted (UINT8)
Behavior2/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It only states that it sets the value and mentions the default (OFF), but does not disclose side effects (e.g., whether a reboot is required, if it affects arming, or if changes are persistent). For a configuration tool, such details are important.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise (two sentences plus type/default) and front-loads the purpose. It contains no unnecessary words, but it could be more structured (e.g., separate sections for behavior, parameters). Still, it is efficient for a simple tool.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple one-parameter tool with no output schema, the description covers the basic purpose and when it might be needed. However, it lacks details about valid parameter values (e.g., whether to pass 'ON'/'OFF' or 1/0) and does not explain any dependencies or effects on flight controller operation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema has 100% description coverage with 'Value for serialrx_inverted (UINT8)', but the tool description adds a default ('OFF'). However, it introduces ambiguity by saying 'UINT8' while the schema declares the parameter type as string. The meaning of valid values (e.g., numeric 0/1 or string 'ON'/'OFF') is unclear, reducing clarity beyond the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb (Set) and resource (serialrx_inverted), and explains the action (Invert the serial RX signal) with context about when it's needed (Required for some receivers on certain FC designs). This distinguishes it from other serial RX settings, though not explicitly from siblings like set_serialrx_halfduplex.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description gives a hint about when to use the tool ('Required for some receivers on certain FC designs'), but it does not specify when not to use it, nor does it compare to alternatives like set_serialrx_provider or set_serialrx_halfduplex. The guidance is implied rather than explicit.

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

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