# econ.yield-curve

Current US Treasury yield curve (1M–30Y constant-maturity yields) plus the 2s10s and 3m10y spreads and an inversion flag (recession signal). Daily data. Source: US Treasury via FRED.

Agent View of the PolicyLayer registry record for `econ.yield-curve`. HTML page: https://policylayer.com/tools/io-github-2s-io-mcp/econ.yield-curve

## Facts

- Tool: `econ.yield-curve`
- Server: Mcp (`@2sio/mcp`) — https://policylayer.com/tools/io-github-2s-io-mcp.md
- Install: `npx -y @2sio/mcp`
- Homepage: https://github.com/2s-io/sdk
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "econ.yield-curve",
    "arguments": {}
  }
}
```

## Why econ.yield-curve is rated Low

This tool queries and returns financial market data (Treasury yields and spreads) with no side effects, reversible actions, code execution, destructive operations, or financial transactions. It is a pure data retrieval operation, placing it firmly in the Read category.

From the tool's own definition: "Tool retrieves 'Current US Treasury yield curve' and historical daily data from FRED; no parameters mentioned that would permit modification, deletion, or financial transactions. Described as a query/fetch operation providing market data."

## Use case

AI agents call econ.yield-curve to retrieve information from Mcp 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 Mcp:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "econ.yield-curve": {}
  }
}
```

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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-2s-io-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-2s-io-mcp