Run a VDC-grade clash detection pass between two element categories in a translated model, returning each overlapping element pair with a severity (critical/warning), a trade-specific suggested fix, and an estimated rework hour count. Uses AABB bounding-box intersection on elements pulled from th...
Part of the ScanBIM MCP server.
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AI agents call detect_clashes to retrieve information from ScanBIM MCP without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though detect_clashes only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"detect_clashes": {}
}
}See the full ScanBIM MCP policy for all 19 tools.
These attack patterns abuse exactly the kind of access detect_clashes gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Run a VDC-grade clash detection pass between two element categories in a translated model, returning each overlapping element pair with a severity (critical/warning), a trade-specific suggested fix, and an estimated rework hour count. Uses AABB bounding-box intersection on elements pulled from the APS Model Derivative properties endpoint, with a synthetic fallback if properties have not yet been computed. When to use: you want a first-pass coordination report between two MEP or structural trades (e.g. Ducts vs Structural Framing) for a model that has finished translating. When NOT to use: the model has not finished translating yet (call get_model_metadata first to confirm manifest.status=='success'), or you need clash detection between more than two categories — call this tool multiple times. APS scopes: data:read viewables:read Rate limits: APS default ~50 req/min per app per endpoint; Model Derivative translation jobs ~60 req/min; OSS uploads size-limited per file to 100MB for direct upload, larger via resumable. Errors: 401 APS token expired/invalid — refresh; 403 scope or resource permission denied; 404 URN not found or has no derivatives yet — check the ID; 429 rate limited — backoff and retry; 5xx APS upstream outage — retry with jitter. Side effects: READ-ONLY on APS. Inserts a row into D1 usage_log for analytics. Idempotent — repeated calls return the same clash set for a given model.. It is categorised as a Read tool in the ScanBIM MCP MCP Server, which means it retrieves data without modifying state.
Register the ScanBIM MCP server in PolicyLayer and add a rule for detect_clashes: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches ScanBIM MCP. Nothing to install.
detect_clashes is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the detect_clashes rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for detect_clashes. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
detect_clashes is provided by the ScanBIM MCP server (https://scanbim-mcp.itmartin24.workers.dev/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 19 ScanBIM MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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