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nodered-mcp

by ylt

set_flows_state

Start or stop Node-RED flows by setting the runtime state to 'start' or 'stop'.

Instructions

Set the flows runtime state.

Args: state: Target state - valid values: start, stop

Returns: FlowState with new state.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
stateYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
stateNo
Behavior2/5

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

No annotations are provided, so the description carries full responsibility for disclosing behavioral traits. It states the action ('set') and valid states, but does not disclose side effects, permissions, reversibility, or error behavior. For a state-changing operation, this lacks sufficient transparency.

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 extremely concise, with a clean Args/Returns structure. Every word adds value, and there is no redundancy or fluff.

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?

For a simple 1-parameter tool with an output schema, the description covers the essentials: action, parameter semantics, and return type. It does not elaborate on context or caveats, but the tool's simplicity means it is reasonably complete.

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

Parameters4/5

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

With schema coverage at 0%, the description compensates by explaining the 'state' parameter and enumerating valid values (start, stop). This is essential information not present in the schema. It could be improved by describing what each state does, but it's adequate for a single-param tool.

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 uses a specific verb ('Set') and clearly identifies the resource ('flows runtime state'), distinguishing it from sibling tools that modify flow definitions (update_flow, patch_flow) or retrieve state (get_flows_state).

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

Usage Guidelines4/5

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

The description makes the use case clear: set the runtime state, with valid values start/stop implying the tool is for starting/stopping flows. It does not explicitly mention alternatives or exclusions, but the context is sufficient for most agents.

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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