# compute_hard_material_in_trench

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_manhole. Linear extra-over measurement of hard material encountered during drainage trench excavation. Discriminates between natural rock (CESMM4 E.6 / NRM2 5.6.1 / MMHW 500.6.1 / SMM7 R12.6.1) and artificial hard material — buried concrete / masonry / obstructions (CESMM4 E.7 / NRM2 5.6.2 / MMHW 500.6.2 / SMM7 R12.6.2). The platform's first dual-quantity WorkItem: carries both length_m and volume_m3 so CESMM4/NRM2 (m³) and MMHW/SMM7 (m) each render with their correct unit per the standards' rules. Eight variant presets cover both hard-material types × four depth bands. SMM7 R12 deems trench excavation (including hard material) included in the pipe-run rate — the SMM7 handler emits a zero-priceable annotated line for tender transparency (third use of the deemed-included extra-over annotation pattern). Closes the drainage_ancillaries L2 leaf at 4/4 members. Sibling assemblies: connection_to_existing (S32), ditch (S33), pipework_testing (S33). Example params: length_m=10 m (0.5–500), max_depth_m=1.5 m (0.3–10), trench_width_m=0.7 m (0.3–3). Example call: {"params": {"length_m": 10, "max_depth_m": 1.5, "trench_width_m": 0.7}, "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_hard_material_in_trench`. HTML page: https://policylayer.com/tools/com-civilquants-civilquants/compute-hard-material-in-trench

## Facts

- Tool: `compute_hard_material_in_trench`
- 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 hard-material extra-over scenario. Geometry interpretation: - `length_m` is the chainage extent of the hard-material zone (i.e. h |
| `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_hard_material_in_trench",
    "arguments": {
      "params": {}
    }
  }
}
```

## Why compute_hard_material_in_trench is rated Low

This tool performs parametric estimation and quantity measurement/calculation for civil engineering bills of quantities. It reads/computes measurement outputs (length_m, volume_m3) based on input parameters — no data is written, deleted, or executed. It is a computation/query tool that returns measurement data.

From the tool's own definition: "Linear extra-over measurement of hard material encountered during drainage trench excavation. Discriminates between natural rock ... and artificial hard material"

Risk signals: High parameter count (11 properties)

## Use case

AI agents call compute_hard_material_in_trench 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_hard_material_in_trench": {}
  }
}
```

## 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`

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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