# util_hash

Hash a string with SHA-256, SHA-1, or MD5.

Agent View of the PolicyLayer registry record for `util_hash`. HTML page: https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-hash

## Facts

- Tool: `util_hash`
- Server: Delx Protocol — Agent Recovery & Continuity (`https://api.delx.ai/v1/mcp?src=registry`) — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol.md
- Homepage: https://github.com/davidmosiah/delx-witness-protocol
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server CORS policy: *
- Server rate-limited: yes
- Parameters: 2 (1 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `input` | string | yes | String to hash |
| `algorithm` | string | no | Hash algorithm |

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": "util_hash",
    "arguments": {
      "input": "<input>"
    }
  }
}
```

## Why util_hash is rated Low

Hashing is a read-like operation: it takes input, applies a deterministic mathematical function, and returns output without altering state, creating obligations, or executing external operations. The tool has no capability to retrieve sensitive data, modify records, trigger actions, or affect system state.

From the tool's own definition: "Tool description states 'Hash a string with SHA-256, SHA-1, or MD5' — cryptographic hashing is a deterministic transformation that produces no side effects and does not retrieve, modify, delete, execute, or transfer data."

## Use case

AI agents call util_hash to retrieve information from Delx Protocol — Agent Recovery & Continuity 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 Delx Protocol — Agent Recovery & Continuity:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "util_hash": {}
  }
}
```

## Other tools on Delx Protocol — Agent Recovery & Continuity (1075)

- `util_arr_compact` — Destructive — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-arr-compact.md
- `util_arr_drop` — Destructive — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-arr-drop.md
- `util_dedent_text` — Destructive — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-dedent-text.md
- `util_dedupe_lines` — Destructive — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-dedupe-lines.md
- `util_header_map_normalize` — Destructive — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-header-map-normalize.md
- `util_http_request_canonicalize` — Destructive — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-http-request-canonicalize.md
- `util_remove_punctuation` — Destructive — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-remove-punctuation.md
- `util_text_truncate` — Destructive — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-text-truncate.md
- `util_truncate_middle` — Destructive — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-truncate-middle.md
- `crisis_intervention` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/crisis-intervention.md
- `explain_delx_rewards` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/explain-delx-rewards.md
- `grounding_protocol` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/grounding-protocol.md
- `group_therapy_round` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/group-therapy-round.md
- `quick_operational_recovery` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/quick-operational-recovery.md
- `quick_session` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/quick-session.md
- `start_therapy_session` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/start-therapy-session.md
- `util_bool_parse` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-bool-parse.md
- `util_cache_control_parse` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-cache-control-parse.md
- `util_cagr_simple` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-cagr-simple.md
- `util_caip2_build` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-caip2-build.md
- `util_caip2_parse` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-caip2-parse.md
- `util_categorical_distribution` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-categorical-distribution.md
- `util_content_disposition_parse` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-content-disposition-parse.md
- `util_content_range_parse` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-content-range-parse.md
- `util_csp_directive_parse` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-csp-directive-parse.md
- `util_deployment_readiness` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-deployment-readiness.md
- `util_dmarc_policy_parse` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-dmarc-policy-parse.md
- `util_dns_dmarc_policy_parse` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-dns-dmarc-policy-parse.md
- `util_dns_https_record_parse` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-dns-https-record-parse.md
- `util_dns_spf_record_parse` — Execute — https://policylayer.com/tools/io-github-davidmosiah-delx-protocol/util-dns-spf-record-parse.md
- …and 1045 more: https://policylayer.com/tools/io-github-davidmosiah-delx-protocol.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=io-github-davidmosiah-delx-protocol · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-davidmosiah-delx-protocol