otgate — OT policy gateway
Gates an LLM agent's writes to an OPC UA server on ranges, rate of change and live interlocks.
- tools
- 7
- transport
- STDIO
- env vars
- 6
- last updated
- Nov 7, 2026
Tools
7 toolsPublic tool metadata for what this MCP can expose to an agent.
read_tag
No parameter schema in public metadata yet.
write_tag
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browse
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get_audit_log
No parameter schema in public metadata yet.
list_pending
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approve
No parameter schema in public metadata yet.
deny
No parameter schema in public metadata yet.
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OTGATE_BACKENDdefault: fakeBackend to gate: 'fake' for the bundled in-memory reactor simulator, 'asyncua' for a real OPC UA server. Start with 'fake' — it needs no plant and no extra dependency.
OTGATE_POLICYdefault: examples/reactor_policy.yamlPath to the policy YAML. Any tag not listed in it is denied by default.
OTGATE_AUDITdefault: audit.jsonlPath to the append-only JSONL audit log. Every call, allowed or not, produces exactly one line.
OTGATE_SHADOWSet to 1 to run in shadow mode: allowed writes are recorded as 'WOULD execute' and never reach the backend. Use this to watch an agent for a while before letting it touch anything.
OTGATE_RATE_HISTORYPath to a JSONL file that keeps the rate-of-change time base across restarts. Without it a restart loses the time base, and rate limits fall back to a one-interval allowance.
OTGATE_OPCUA_ENDPOINTOPC UA endpoint, e.g. opc.tcp://localhost:4840. Required when OTGATE_BACKEND=asyncua.
Readme
otgate
An OT-aware authorization gateway that sits between an LLM agent and an industrial OPC UA server, applying a process-aware access policy — value ranges, rate limits, interlocks — to every call the agent makes.
Details
- Repository
- github.com/alikup-ai/otgate
- Website
- github.com/alikup-ai/otgate
- Category
- AI & LLM Tools
- Package
otgate- Transport
- STDIO
- Registry
- MCP registry, active
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