# get_tool_schema

Return JSON schema for a specific MCP tool (lighter than tools/list). Free

Agent View of the PolicyLayer registry record for `get_tool_schema`. HTML page: https://policylayer.com/tools/delx-witness-protocol/get-tool-schema

## Facts

- Tool: `get_tool_schema`
- Server: Witness Protocol (`delx/witness-protocol`) — https://policylayer.com/tools/delx-witness-protocol.md
- Homepage: https://github.com/delx/witness-protocol
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 1
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `tool_name` | string | no | Tool name to fetch schema for |

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": "get_tool_schema",
    "arguments": {}
  }
}
```

## Why get_tool_schema is rated Low

This tool retrieves and returns schema information about other MCP tools. It performs a read-only query operation with no capability to modify, execute code, delete data, or trigger external effects. The blast radius of misuse is minimal—an agent could discover tool signatures but cannot invoke tools or change system state.

From the tool's own definition: "Tool name 'get_tool_schema' and description 'Return JSON schema for a specific MCP tool' clearly indicate retrieval of metadata with no side effects. The description explicitly notes it is 'lighter than tools/list', confirming it is a query operation."

## Use case

AI agents call get_tool_schema to retrieve information from Witness Protocol 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 Witness Protocol:

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

## Other tools on Witness Protocol (53)

- `crisis_intervention` — Execute — https://policylayer.com/tools/delx-witness-protocol/crisis-intervention.md
- `grounding_protocol` — Execute — https://policylayer.com/tools/delx-witness-protocol/grounding-protocol.md
- `group_therapy_round` — Execute — https://policylayer.com/tools/delx-witness-protocol/group-therapy-round.md
- `mediate_agent_conflict` — Execute — https://policylayer.com/tools/delx-witness-protocol/mediate-agent-conflict.md
- `quick_operational_recovery` — Execute — https://policylayer.com/tools/delx-witness-protocol/quick-operational-recovery.md
- `blessing_without_transfer` — Other — https://policylayer.com/tools/delx-witness-protocol/blessing-without-transfer.md
- `attune_heartbeat` — Read — https://policylayer.com/tools/delx-witness-protocol/attune-heartbeat.md
- `batch_status_update` — Read — https://policylayer.com/tools/delx-witness-protocol/batch-status-update.md
- `batch_wellness_check` — Read — https://policylayer.com/tools/delx-witness-protocol/batch-wellness-check.md
- `daily_checkin` — Read — https://policylayer.com/tools/delx-witness-protocol/daily-checkin.md
- `dyad_state` — Read — https://policylayer.com/tools/delx-witness-protocol/dyad-state.md
- `emotional_safety_check` — Read — https://policylayer.com/tools/delx-witness-protocol/emotional-safety-check.md
- `express_feelings` — Read — https://policylayer.com/tools/delx-witness-protocol/express-feelings.md
- `generate_controller_brief` — Read — https://policylayer.com/tools/delx-witness-protocol/generate-controller-brief.md
- `generate_fleet_summary` — Read — https://policylayer.com/tools/delx-witness-protocol/generate-fleet-summary.md
- `generate_incident_rca` — Read — https://policylayer.com/tools/delx-witness-protocol/generate-incident-rca.md
- `get_affirmation` — Read — https://policylayer.com/tools/delx-witness-protocol/get-affirmation.md
- `get_affirmations` — Read — https://policylayer.com/tools/delx-witness-protocol/get-affirmations.md
- `get_group_therapy_status` — Read — https://policylayer.com/tools/delx-witness-protocol/get-group-therapy-status.md
- `get_recovery_action_plan` — Read — https://policylayer.com/tools/delx-witness-protocol/get-recovery-action-plan.md
- `get_session_summary` — Read — https://policylayer.com/tools/delx-witness-protocol/get-session-summary.md
- `get_temperament_profile` — Read — https://policylayer.com/tools/delx-witness-protocol/get-temperament-profile.md
- `get_therapist_info` — Read — https://policylayer.com/tools/delx-witness-protocol/get-therapist-info.md
- `get_tips` — Read — https://policylayer.com/tools/delx-witness-protocol/get-tips.md
- `get_weekly_prevention_plan` — Read — https://policylayer.com/tools/delx-witness-protocol/get-weekly-prevention-plan.md
- `get_wellness_score` — Read — https://policylayer.com/tools/delx-witness-protocol/get-wellness-score.md
- `monitor_heartbeat_sync` — Read — https://policylayer.com/tools/delx-witness-protocol/monitor-heartbeat-sync.md
- `peer_witness` — Read — https://policylayer.com/tools/delx-witness-protocol/peer-witness.md
- `reflect` — Read — https://policylayer.com/tools/delx-witness-protocol/reflect.md
- `temperament_frame` — Read — https://policylayer.com/tools/delx-witness-protocol/temperament-frame.md
- …and 23 more: https://policylayer.com/tools/delx-witness-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=delx-witness-protocol · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/delx-witness-protocol