# OPC UA NodeSet Gate

> Deterministic release-compatibility preflight for OPC UA NodeSet2 XML.

- name: io.github.ChanghuLiu/opc-ua-nodeset-compatibility-gate
- version: 0.1.3
- connection class: R0 (autonomous)
- trust: 94/100
- quality: 75/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/io.github.ChanghuLiu%2Fopc-ua-nodeset-compatibility-gate
- tools: https://api.protogrid.dev/v1/servers/io.github.ChanghuLiu%2Fopc-ua-nodeset-compatibility-gate/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "opc-ua-nodeset-compatibility-gate": {
      "type": "http",
      "url": "https://nodeset.regevidencehub.com/mcp"
    }
  }
}
```


## Trust

- hygiene: 100
- liveness: 100
- freshness: 100
- provenance: 80
- drivers: +repository +namespace-matches-repo +reachable +uptime-99% +updated-19d-ago
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 75/100 (good)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 100 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 5 of 5 tools declare readOnlyHint or destructiveHint
- pass `tools.directory_hints`: every tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHint
- pass `tools.token_cost`: about 1,060 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 25 (weight 15)

- warn `stability.changes`: 11 tool changes in 30 days
- fail `stability.rug_pull`: 5 tools kept their name but changed most of their description in 30 days; review before trusting them

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 5, about 1,060 tokens to load them all
- tool set hash: 1fb1fea4724012da3a05f787321f0c12
- tools last changed: 2026-10-15T19:38:24.088Z
- badge: [![protogrid quality](https://protogrid.dev/badge/io.github.ChanghuLiu/opc-ua-nodeset-compatibility-gate.svg)](https://protogrid.dev/servers/io.github.ChanghuLiu/opc-ua-nodeset-compatibility-gate)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

- 2026-10-15 `nodeset_compatibility_status` changed (description)
  - before: Return bounded service metadata for OPC UA NodeSet Compatibility Gate. Use this only to discover deployment stage, deterministic static-analysis scope, production availability and payment status; do not use it to compare NodeSets. The result contains product, stage, deterministic, payment_enabled, production_enabled and scope fields.
  - after: Return bounded service metadata for OPC UA NodeSet Compatibility Gate. Use this only to discover deployment stage, deterministic static-analysis scope, production availability and payment status; do not use it to compare NodeSets. The result includes the shared MCP endpoint and explicitly lists which tool calls are free and which require x402 payment.
- 2026-09-29 `audit_uploaded_nodesets` changed (description) **meaning changed**
  - before: Audit two NodeSets previously uploaded with begin_nodeset_upload and append_nodeset_chunk. Upload IDs are consumed after this call.
  - after: Compare two large NodeSet2 XML revisions after both have been fully staged with begin_nodeset_upload and append_nodeset_chunk. Pass old_upload_id for the baseline revision and new_upload_id for the candidate revision. This call consumes both upload IDs, so do not reuse them afterward. The report has the same shape as audit_nodeset_compatibility: result (COMPATIBLE, REVIEW_REQUIRED, BREAKING, or INSUFFICIENT_INPUT), old/new node counts, issue_count, summary by change code, and issues with code, severity, node_id and detail. Use the direct audit tool instead when both complete XML documents fit in a single request.
- 2026-09-29 `append_nodeset_chunk` changed (description) **meaning changed**
  - before: Append the next text chunk to a temporary NodeSet upload. Send chunks in original order without modification.
  - after: Append the next unmodified text chunk to a temporary NodeSet2 upload created by begin_nodeset_upload. Pass upload_id exactly as returned by begin_nodeset_upload and chunk as the next consecutive XML text segment; send every chunk in original order without overlap, omission or reformatting. On success the result returns status=OK, upload_id and cumulative received_chars; UNKNOWN_UPLOAD_ID or UPLOAD_TOO_LARGE indicates the upload cannot continue. This tool only stages XML in temporary memory and does not parse or compare it yet.
- 2026-09-29 `begin_nodeset_upload` changed (description) **meaning changed**
  - before: Start a temporary in-memory NodeSet XML upload and return an upload_id. Use for large NodeSets that should be sent in multiple chunks.
  - after: Start one temporary in-memory upload for a large NodeSet2 XML document. Call this once for the old baseline and once for the new candidate when the complete XML documents are too large for audit_nodeset_compatibility. It returns upload_id and max_total_chars. Append that document's chunks in original order with append_nodeset_chunk. Uploads expire after 15 minutes and the service allows at most four active uploads; this tool stores only temporary process memory and does not modify an external system.
- 2026-09-29 `nodeset_compatibility_status` changed (description) **meaning changed**
  - before: _empty_
  - after: Return bounded service metadata for OPC UA NodeSet Compatibility Gate. Use this only to discover deployment stage, deterministic static-analysis scope, production availability and payment status; do not use it to compare NodeSets. The result contains product, stage, deterministic, payment_enabled, production_enabled and scope fields.
- 2026-09-29 `audit_nodeset_compatibility` changed (description) **meaning changed**
  - before: Compare two OPC UA NodeSet2 XML documents and report deterministic release-compatibility changes.
  - after: Compare two complete OPC UA NodeSet2 XML documents when both fit in a single request. Pass old_nodeset_xml as the full baseline revision and new_nodeset_xml as the full candidate revision. The deterministic report returns result (COMPATIBLE, REVIEW_REQUIRED, BREAKING, or INSUFFICIENT_INPUT), old_node_count, new_node_count, issue_count, a summary keyed by change code, and issues containing code, severity, node_id and detail. Examples include NODE_ADDED, NODE_REMOVED, DATA_TYPE_CHANGED and reference changes. For large XML documents use begin_nodeset_upload + append_nodeset_chunk for each revision, then audit_uploaded_nodesets instead.
- 2026-09-28 `audit_uploaded_nodesets` changed (annotations)
- 2026-09-28 `append_nodeset_chunk` changed (annotations)
- 2026-09-28 `begin_nodeset_upload` changed (annotations)
- 2026-09-28 `nodeset_compatibility_status` changed (annotations)

Full history: https://api.protogrid.dev/v1/servers/io.github.ChanghuLiu%2Fopc-ua-nodeset-compatibility-gate/changes

## Remotes

- https://nodeset.regevidencehub.com/mcp (streamable-http, auth none, reachable true, uptime30d 0.98876405)

## Packages

_none_

## Tools (5)

- `append_nodeset_chunk`: Append the next unmodified text chunk to a temporary NodeSet2 upload created by begin_nodeset_upload. Pass upload_id exactly as returned by begin_nodeset_upload and chunk as the next consecutive XML text segment; send every chunk in original order without overlap, omission or reformatting. On success the result returns status=OK, upload_id and cumulative received_chars; UNKNOWN_UPLOAD_ID or UPLOAD_TOO_LARGE indicates the upload cannot continue. This tool only stages XML in temporary memory and does not parse or compare it yet.
- `audit_nodeset_compatibility`: Compare two complete OPC UA NodeSet2 XML documents when both fit in a single request. Pass old_nodeset_xml as the full baseline revision and new_nodeset_xml as the full candidate revision. The deterministic report returns result (COMPATIBLE, REVIEW_REQUIRED, BREAKING, or INSUFFICIENT_INPUT), old_node_count, new_node_count, issue_count, a summary keyed by change code, and issues containing code, severity, node_id and detail. Examples include NODE_ADDED, NODE_REMOVED, DATA_TYPE_CHANGED and reference changes. For large XML documents use begin_nodeset_upload + append_nodeset_chunk for each revision, then audit_uploaded_nodesets instead.
- `audit_uploaded_nodesets`: Compare two large NodeSet2 XML revisions after both have been fully staged with begin_nodeset_upload and append_nodeset_chunk. Pass old_upload_id for the baseline revision and new_upload_id for the candidate revision. This call consumes both upload IDs, so do not reuse them afterward. The report has the same shape as audit_nodeset_compatibility: result (COMPATIBLE, REVIEW_REQUIRED, BREAKING, or INSUFFICIENT_INPUT), old/new node counts, issue_count, summary by change code, and issues with code, severity, node_id and detail. Use the direct audit tool instead when both complete XML documents fit in a single request.
- `begin_nodeset_upload`: Start one temporary in-memory upload for a large NodeSet2 XML document. Call this once for the old baseline and once for the new candidate when the complete XML documents are too large for audit_nodeset_compatibility. It returns upload_id and max_total_chars. Append that document's chunks in original order with append_nodeset_chunk. Uploads expire after 15 minutes and the service allows at most four active uploads; this tool stores only temporary process memory and does not modify an external system.
- `nodeset_compatibility_status`: Return bounded service metadata for OPC UA NodeSet Compatibility Gate. Use this only to discover deployment stage, deterministic static-analysis scope, production availability and payment status; do not use it to compare NodeSets. The result includes the shared MCP endpoint and explicitly lists which tool calls are free and which require x402 payment.