# spine_control_bones

Write custom rotate, translate, and scale timelines for one or more existing bones into a Spine JSON copy. Use this when you know exact bone names and keyframes. This controls bones through JSON animation data only; it does not automate the Spine editor UI, bind meshes, edit weights, create IK, or mutate .spine binaries directly.

Agent View of the PolicyLayer registry record for `spine_control_bones`. HTML page: https://policylayer.com/tools/1425sd-spine-mcp/spine-control-bones

## Facts

- Tool: `spine_control_bones`
- Server: Spine (`1425sd/spine-mcp`) — https://policylayer.com/tools/1425sd-spine-mcp.md
- Homepage: https://github.com/1425sd/spine-MCP
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

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

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "spine_control_bones",
    "arguments": {}
  }
}
```

## Why spine_control_bones is rated Medium

The tool creates or modifies animation data by writing keyframe timelines into a Spine JSON file. It operates on a copy (not in-place binary mutation), making it reversible. No code execution, deletion, or financial operations are involved.

From the tool's own definition: "Write custom rotate, translate, and scale timelines for one or more existing bones into a Spine JSON copy"

## Use case

AI agents use spine_control_bones to create or update resources in Spine, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Spine environment.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Spine:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "spine_control_bones": {
      "limits": [
        {
          "counter": "spine_control_bones_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Spine (15)

- `spine_build_animation_from_json` — Execute — https://policylayer.com/tools/1425sd-spine-mcp/spine-build-animation-from-json.md
- `spine_clean` — Execute — https://policylayer.com/tools/1425sd-spine-mcp/spine-clean.md
- `spine_learn_from_corpus` — Execute — https://policylayer.com/tools/1425sd-spine-mcp/spine-learn-from-corpus.md
- `spine_open_project` — Execute — https://policylayer.com/tools/1425sd-spine-mcp/spine-open-project.md
- `spine_analyze_json` — Read — https://policylayer.com/tools/1425sd-spine-mcp/spine-analyze-json.md
- `spine_get_generation_guide` — Read — https://policylayer.com/tools/1425sd-spine-mcp/spine-get-generation-guide.md
- `spine_info` — Read — https://policylayer.com/tools/1425sd-spine-mcp/spine-info.md
- `spine_recommend_animation_params` — Read — https://policylayer.com/tools/1425sd-spine-mcp/spine-recommend-animation-params.md
- `spine_scan_corpus` — Read — https://policylayer.com/tools/1425sd-spine-mcp/spine-scan-corpus.md
- `spine_add_simple_animation` — Write — https://policylayer.com/tools/1425sd-spine-mcp/spine-add-simple-animation.md
- `spine_build_animation_from_existing_project` — Write — https://policylayer.com/tools/1425sd-spine-mcp/spine-build-animation-from-existing-project.md
- `spine_create_loading_animation_preset` — Write — https://policylayer.com/tools/1425sd-spine-mcp/spine-create-loading-animation-preset.md
- `spine_export` — Write — https://policylayer.com/tools/1425sd-spine-mcp/spine-export.md
- `spine_generate_animation_json` — Write — https://policylayer.com/tools/1425sd-spine-mcp/spine-generate-animation-json.md
- `spine_import_json` — Write — https://policylayer.com/tools/1425sd-spine-mcp/spine-import-json.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=1425sd-spine-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/1425sd-spine-mcp