OpenMEP duct sizing
NPM · @OPENMEP/MCP · SCANNED SEP 26
Deterministic HVAC duct sizing: size one run or a supply/return network, grade existing sections.
Available components
How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. How we score → Why this is hard to score →
Supply Chain Security98
- No malware found by supply-chain analysis.Pass
- No known CVEs affecting this package version or its production dependencies.Pass
- No install/post-install scripts declared.Pass
- 32 of 96 dependencies flagged as unhealthy. View diagnostics → Partial
Provenance & Transparency45
- Source repository is publicly reachable at the declared URL. View diagnostics → Pass
- Provenance check failed: no build-provenance attestation is published. See how to fix → View diagnostics → Fail
- Clear OSI-approved license (MIT).Pass
- Actively maintained (last published 3 days ago).Pass
- Disclosure check failed: no security disclosure policy was found in the source repository. See how to fix → Fail
Schema Quality & AI Usability71
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 379 tokens (~189/item across 2 items; 2 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management0
- Stability not yet verified: not enough scan history yet (needs a 30-day window).Unverified
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 2 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 3 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Unverified: 1 category
A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.
How do I install the OpenMEP duct sizing MCP server?
OpenMEP duct sizing runs locally as an npm package, launched with npx -y @openmep/mcp. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
npm · @openmep/mcp
claude mcp add samarmstrong-openmep -- npx -y @openmep/mcp
{
"mcpServers": {
"samarmstrong-openmep": {
"command": "npx",
"args": [
"-y",
"@openmep/mcp"
]
}
}
} {
"servers": {
"samarmstrong-openmep": {
"command": "npx",
"args": [
"-y",
"@openmep/mcp"
]
}
}
} codex mcp add samarmstrong-openmep -- npx -y @openmep/mcp
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"samarmstrong-openmep": {
"type": "local",
"command": [
"npx",
"-y",
"@openmep/mcp"
],
"enabled": true
}
}
} openclaw mcp add samarmstrong-openmep --command npx --arg -y --arg @openmep/mcp
mcp_servers:
samarmstrong-openmep:
command: "npx"
args: ["-y", "@openmep/mcp"] {
"McpServers": {
"samarmstrong-openmep": {
"Transport": "stdio",
"Command": "npx",
"Arguments": [
"-y",
"@openmep/mcp"
]
}
}
} assistant mcp add samarmstrong-openmep -t stdio -c npx -a -y @openmep/mcp
{
"mcpServers": {
"samarmstrong-openmep": {
"command": "npx",
"args": [
"-y",
"@openmep/mcp"
]
}
}
} Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 25 Sept 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 23 Sept 26 +15
- Malware scan: unverified → pass ▲ security
- 22 Sept 26 54
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 26 Sept 2026 · Analysed npm/@openmep/mcp@0.1.0
Provenance No attestation
The registry publishes no build provenance for this version, so there is nothing to verify.
| Result | No attestation |
|---|---|
| Ecosystem | npm |
Background: How many MCP packages publish verified provenance →
Dependencies 96 packages
| Packages resolved | 96 |
|---|---|
| Stale | 31 |
| No linked repository | 1 |
| Tree resolution | Complete |
Background: SBOMs and build attestations, explained →
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
size_duct Size one duct ~146
Recommend a standard round diameter for one duct run carrying a given CFM, with velocity and friction at that size. Optionally grade an existing round, rect, or oval section as ok, undersized, or oversized.
| Name | Type | Req | Description |
|---|---|---|---|
| airflowType | string | – | System, which sets the velocity cap. Default supply. |
| cfm | number | yes | Airflow the run carries, CFM. |
| existing | – | – | Existing section to grade: { diameterIn } for round, or { shape: rect|oval, widthIn, heightIn }. |
| role | string | – | main (at equipment), branch (serves several terminals), or runout (one terminal). Default main. |
No output schema declared.
No examples provided.
size_duct_network Size a duct network ~120
Size every supply, return, exhaust, and outside-air segment of a connected duct network. Each terminal's requiredCfm is carried along its shortest same-system path to equipment and summed per segment; roles (main/branch/runout) are inferred. Returns per-segment recommendations, grades for segments with an existing section, and findings: missing-required-cfm, no-equipment-path, dangling-reference, mixed-system-segment, undersized, oversized.
| Name | Type | Req | Description |
|---|---|---|---|
| items | array | yes | Every terminal, segment, fitting, and equipment item in the network. |
No output schema declared.
No examples provided.
What is the OpenMEP duct sizing MCP server?
OpenMEP duct sizing is an MCP server listed in the public MCP registry as io.github.samarmstrong/openmep. Deterministic HVAC duct sizing: size one run or a supply/return network, grade existing sections. This page covers its npm package (@openmep/mcp).
Is the OpenMEP duct sizing MCP server safe to use?
OpenMEP duct sizing scores 69 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 26 September 2026. It declares no install or post-install scripts. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the OpenMEP duct sizing MCP server expose?
OpenMEP duct sizing exposes 2 tools: size_duct, size_duct_network. Their descriptions and schemas cost roughly 266 tokens of context every time the server is loaded.
Is the OpenMEP duct sizing MCP server still maintained?
OpenMEP duct sizing is still listed as active in the MCP registry. We last reached this channel on 26 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.
What licence is the OpenMEP duct sizing MCP server under?
OpenMEP duct sizing declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.