# science.materials.elasticity

Get mechanical/elastic properties for a material: bulk modulus, shear modulus (Voigt-Reuss-Hill averages), universal anisotropy index, Poisson ratio, and full 6x6 elastic tensor (IEEE format). Essential for structural materials screening and mechanical simulations (Materials Project)

Agent View of the PolicyLayer registry record for `science.materials.elasticity`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/science.materials.elasticity

## Facts

- Tool: `science.materials.elasticity`
- Server: Apibase (`apibase-mcp-client`) — https://policylayer.com/tools/io-github-whiteknightonhorse-apibase.md
- Install: `npx -y apibase-mcp-client`
- Homepage: https://github.com/whiteknightonhorse/APIbase
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 1 (1 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `material_id` | string | yes | Materials Project ID (e.g. "mp-149"). Returns bulk/shear modulus, Poisson ratio, elastic tensor |

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": "science.materials.elasticity",
    "arguments": {
      "material_id": "<material_id>"
    }
  }
}
```

## Why science.materials.elasticity is rated Low

Tool queries material property database; returns read-only scientific data without modifications or external effects.

From the tool's own definition: "Get mechanical/elastic properties for a material; retrieves data with no side effects."

## Use case

AI agents call science.materials.elasticity to retrieve information from Apibase 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 Apibase:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "science.materials.elasticity": {}
  }
}
```

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## 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=io-github-whiteknightonhorse-apibase · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-whiteknightonhorse-apibase