compute_vehicle_restraint_system
Paid tier only. Calling this without an authenticated CivilQuants account returns TIER_INSUFFICIENT — sign up at https://civilquants.com/pricing or use the free-tier alternative compute_end_area_earthworks. Vehicle restraint system (VRS) for highway works per SHW Cl. 401-419 and BS EN 1317. Discr...
This record as markdown: /tools/com-civilquants-civilquants/compute-vehicle-restraint-system.md
What compute_vehicle_restraint_system does on Civilquants
AI agents call compute_vehicle_restraint_system to retrieve information from Civilquants without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
params | object | Yes | Parameters for a single vehicle restraint system run. Geometry interpretation: - ``length_m`` is the run length along the highway alignment. - ``post_spaci |
standard | string | — | |
output_mode | string | — | |
deliverables | object | — |
Parameters from the server's own tool schema.
Why compute_vehicle_restraint_system is rated Low
This tool performs parametric quantity estimation (a calculation/read operation) for civil engineering Bills of Quantities. It reads input parameters and returns computed estimates. The 'paid tier only' mention is an access control note, not a financial transaction initiated by the tool itself. The description focuses on discriminating system types and computing outputs, which is a read/query operation.
From the tool's definition 'Parametric estimating engine' and 'compute_vehicle_restraint_system' — the tool computes Bills of Quantities estimates for a vehicle restraint system per SHW/BS EN 1317 specs; no indication of data mutation, code execution, deletion, or financial transaction…
Risk signalsHigh parameter count (26 properties)
Attacks that exploit this kind of access
The rule that runs compute_vehicle_restraint_system safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Civilquants, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For compute_vehicle_restraint_system, this is the rule to start with:
compute_vehicle_restraint_system is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Civilquants, apply this rule, and every compute_vehicle_restraint_system call is checked against it from then on.
Questions about compute_vehicle_restraint_system
Paid tier only. Calling this without an authenticated CivilQuants account returns TIER_INSUFFICIENT — sign up at https://civilquants.com/pricing or use the free-tier alternative compute_end_area_earthworks. Vehicle restraint system (VRS) for highway works per SHW Cl. 401-419 and BS EN 1317. Discriminates between six structural system types via the vrs_system_type enum: tensioned and untensioned corrugated steel beam, wire rope, in-situ concrete step barrier, precast concrete single-slope, and combined heavy-duty (corrugated beam over concrete kerb upstand). FIRST member of the highway_restraint L2 leaf — opens the brand-new highway L1 category as the 40th assembly. Six variant presets cover the principal UK commercial scenarios: motorway verge TCB N2/W4, motorway central wire rope N2/W6, urban untensioned N2/W2, bridge approach concrete step H2/W1, median precast single-slope H2/W2, and high-containment verge H4a/W4. Routes via three new WorkCategory entries (VEHICLE_RESTRAINT_SYSTEM, VRS_TERMINAL, VRS_TRANSITION) plus reuse of CONCRETE_REINFORCED, REINFORCEMENT, FORMWORK and EXCAVATION_TRENCH for the concrete variants. Codes: CESMM4 X.3 (Class X §3 — crash barriers), NRM2 34.7 (Site works — crash barriers), MMHW 400.1.{ww}.{cl} (Series 400 — Road Restraint Systems, with 2D banding by working_width × containment), SMM7 Q40.5 (Section Q40 — Fencing, crash barriers). 24th use of the classed-then-legacy attribute discrimination pattern; 5th use of the declared-then-banded pattern AND the FIRST 2D-banded handler (MMHW 400.1.{ww}.{cl} bands by both axes simultaneously). Example params: length_m=100 m (12–10000), post_spacing_m=2 m (0.5–8), foundation_width_m=0.9 m (0.2–2). Example call: {"params": {"length_m": 100, "post_spacing_m": 2, "foundation_width_m": 0.9}, "standard": "MMHW"}. Omitted parameters use sensible engineering defaults. Pass deliverables=["xlsx","dxf","pdf"] (any subset) to also receive one-shot download URLs in the same call: Excel BoQ (both tiers, watermarked free) plus the dimensioned DXF (CAD) and PDF drawing sheets (paid tier). It is categorised as a Read tool in the Civilquants MCP Server, which means it retrieves data without modifying state.
compute_vehicle_restraint_system accepts 4 parameters: params, standard, output_mode, deliverables. Required: params. The full parameter table on this page comes from the server's own tool schema.
Register the Civilquants MCP server in PolicyLayer and add a rule for compute_vehicle_restraint_system: 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 Civilquants. Nothing to install.
compute_vehicle_restraint_system 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 compute_vehicle_restraint_system 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 compute_vehicle_restraint_system. 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.
compute_vehicle_restraint_system is provided by the Civilquants MCP server (https://api.civilquants.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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