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Lynn-hh

io.github.Lynn-hh/armguard-mcp

reset_estop

Clears a latched software e-stop and force violation after human approval via MCP client; each approval applies only to the e-stop event shown.

Instructions

Release the software e-stop (and any latched force violation). ALWAYS requires human approval via the MCP client, regardless of the approval mode. An approval only releases the e-stop event it was shown for; if another e-stop is latched while the prompt is open, call reset_estop again.

Input Schema

NameRequiredDescriptionDefault

No arguments

Output Schema

NameRequiredDescriptionDefault
noteNoSoftware envelope only (defense in depth). The robot's own safety system and hardware e-stop remain the real safety layer.
reasonNo
dry_runYes
estoppedYes
estop_eventNoNumber of the latched e-stop event
estopped_atNo
reason_sourceNoWho gave the reason: the AI agent (via estop) or the server itself
last_violationNo
executing_plan_idNo
force_violation_latchedYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A4.6/5.0
Behavior4/5

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

Annotations declare non-read-only, non-idempotent, non-destructive, but the description adds the crucial fact that every call routes through human approval and that approvals are scoped to a single e-stop event. The only gap is behavior when no e-stop is latched (error vs. silent no-op), which matters for a non-idempotent tool.

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?

Three short sentences, each doing distinct work: what it does, the approval invariant, and the retry edge case. The most important constraint (approval) is front-loaded before the edge case.

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?

Output schema exists, so return values need no explanation, and the safety-critical approval semantics are fully covered. The remaining hole is the failure/no-op case when nothing is latched, plus no explicit pointer to the `estop` sibling for the inverse operation.

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?

Zero-parameter tool, so there is nothing to disambiguate; baseline applies. The description correctly implies the target state comes from the server's current latch rather than caller input.

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?

Specific verb (release) plus specific resource (the software e-stop and any latched force violation), which cleanly distinguishes it from the sibling `estop` that engages the stop. An agent can tell exactly what state change this performs.

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

Usage Guidelines5/5

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

States the precondition (e-stop latched, including force violations), the mandatory human-approval gate regardless of approval mode, and an explicit re-invocation rule when a second e-stop latches while the prompt is open. That is unusually complete when/when-again guidance.

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