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Buggy1111

shelly-mcp

by Buggy1111

shelly_switch_set

Idempotent

Control a Shelly relay channel by turning it on or off and optionally auto-revert after a set time. Returns the updated channel state with audit logging.

Instructions

Turn a switch/relay channel on or off (optionally auto-revert after N seconds).

Returns the post-action ChannelState. Audit-logged.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
onYes
deviceYes
channelNo
toggle_after_sNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior4/5

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

Annotations already declare idempotentHint=true. The description adds value by mentioning the return of 'ChannelState' and that the action is audit-logged, providing behavioral context beyond structured fields.

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

Conciseness5/5

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

The description is two sentences, front-loaded with the core action, followed by optional behavior, return value, and audit notice. No extraneous information.

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

Completeness4/5

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

With an output schema present, the description sufficiently covers return and audit. However, it could provide more context on required parameters like device identification, but overall it's adequate for a switch control tool.

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?

Parameter schema coverage is 0%, but the description only hints at the 'toggle_after_s' parameter via 'optionally auto-revert after N seconds'. It does not explain 'device', 'channel', or 'on' parameters, leaving a significant gap.

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

Purpose5/5

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

The description explicitly states 'Turn a switch/relay channel on or off' with a specific verb and resource. It also highlights the optional auto-revert feature, distinguishing it from sibling tools like shelly_switch_toggle.

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

Usage Guidelines3/5

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

The description implies usage for on/off control but does not explicitly state when to use this tool versus alternatives like shelly_switch_toggle. It lacks explicit when-not or contextual exclusion guidance.

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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