# 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). Agent View of the PolicyLayer registry record for `compute_vehicle_restraint_system`. HTML page: https://policylayer.com/tools/com-civilquants-civilquants/compute-vehicle-restraint-system ## Facts - Tool: `compute_vehicle_restraint_system` - Server: Civilquants (`https://api.civilquants.com/mcp`) — https://policylayer.com/tools/com-civilquants-civilquants.md - Homepage: https://github.com/https://api.civilquants.com/mcp - Risk category: Read (Low risk) - Registry record: grade F, identity unverified - Server auth posture: open - Server rate-limited: no - Parameters: 4 (1 required) - Recommended policy verdict: Allowed ## Parameters | 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 | no | | | `output_mode` | string | no | | | `deliverables` | object | no | | Parameters from the server's own tool schema. ## Example call (MCP tools/call, JSON-RPC 2.0) ```json { "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "compute_vehicle_restraint_system", "arguments": { "params": {} } } } ``` ## 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 own 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 signals: High parameter count (26 properties) ## Use case 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. ## Recommended policy (PolicyLayer) Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Civilquants: ```json { "version": "1", "default": "deny", "tools": { "compute_vehicle_restraint_system": {} } } ``` ## Other tools on Civilquants (55) - `compute_box_culvert` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-box-culvert.md - `compute_combined_services_trench` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-combined-services-trench.md - `compute_connection_to_existing` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-connection-to-existing.md - `compute_ditch` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-ditch.md - `compute_embankment_cross_section` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-embankment-cross-section.md - `compute_end_area_earthworks` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-end-area-earthworks.md - `compute_gabion_wall` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-gabion-wall.md - `compute_headwall_attenuation_outlet` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-headwall-attenuation-outlet.md - `compute_highway_drainage_channel` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-highway-drainage-channel.md - `compute_lighting_column` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-lighting-column.md - `compute_multi_section_assembly` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-multi-section-assembly.md - `compute_pad_foundation` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-pad-foundation.md - `compute_parapet` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-parapet.md - `compute_pipe_bedding` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-pipe-bedding.md - `compute_reinforced_soil_wall` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-reinforced-soil-wall.md - `compute_road_marking` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-road-marking.md - `compute_single_service_run` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-single-service-run.md - `compute_soakaway` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-soakaway.md - `compute_soil_nailed_slope` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-soil-nailed-slope.md - `compute_traffic_sign` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-traffic-sign.md - `compute_utility_chamber` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-utility-chamber.md - `compute_utility_kiosk_base` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/compute-utility-kiosk-base.md - `recompute_project` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/recompute-project.md - `render_skill_report` — Execute — https://policylayer.com/tools/com-civilquants-civilquants/render-skill-report.md - `compute_attenuation_tank` — Read — https://policylayer.com/tools/com-civilquants-civilquants/compute-attenuation-tank.md - `compute_bored_pile_wall` — Read — https://policylayer.com/tools/com-civilquants-civilquants/compute-bored-pile-wall.md - `compute_cantilever_wall` — Read — https://policylayer.com/tools/com-civilquants-civilquants/compute-cantilever-wall.md - `compute_carrier_pipe_run` — Read — https://policylayer.com/tools/com-civilquants-civilquants/compute-carrier-pipe-run.md - `compute_catchpit` — Read — https://policylayer.com/tools/com-civilquants-civilquants/compute-catchpit.md - `compute_edge_drain` — Read — https://policylayer.com/tools/com-civilquants-civilquants/compute-edge-drain.md - …and 25 more: https://policylayer.com/tools/com-civilquants-civilquants.md ## For agents This record is a snapshot. Live verdicts and the full registry: - Check every server in your MCP config at once: `npx -y policylayer stack` - Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md) - Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events` --- Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=com-civilquants-civilquants · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/com-civilquants-civilquants