# How to integrate Splice MCP with Atomic Agent

```json
{
  "title": "How to integrate Splice MCP with Atomic Agent",
  "toolkit": "Splice MCP",
  "toolkit_slug": "splice_mcp",
  "framework": "Atomic Agent",
  "framework_slug": "atomic-agent",
  "url": "https://composio.dev/toolkits/splice_mcp/framework/atomic-agent",
  "markdown_url": "https://composio.dev/toolkits/splice_mcp/framework/atomic-agent.md",
  "updated_at": "2026-09-07T05:32:35.907Z"
}
```

## Introduction

Atomic Agent is an open-source AI agent that runs on your machine and supports local models through llama.cpp. Connect it to 1,500+ apps through Composio, including Splice.
This guide uses Atomic Agent's built-in Composio integration. You need Atomic Agent v0.5.6 or later, your own Composio API key, and a Splice account. See the [Atomic Agent documentation](https://atomicagent.io/docs/?cta_placement=atomic-agent-docs) for installation instructions.

## Also integrate Splice MCP with

- [ChatGPT](https://composio.dev/toolkits/splice_mcp/framework/chatgpt)
- [Claude Cowork](https://composio.dev/toolkits/splice_mcp/framework/claude-cowork)
- [Hermes](https://composio.dev/toolkits/splice_mcp/framework/hermes-agent)

## TL;DR

### How Atomic Agent connects to Splice
Atomic Agent connects to Composio's Tool Router over Streamable HTTP MCP. It discovers the tools needed for your request, and Composio handles account authentication.
Execution and account-connection tools follow Atomic Agent's configured approval policy. Review any approval prompt before allowing an action on your connected account.

## Connect Splice MCP to Atomic Agent

### Connect Splice to Atomic Agent
- Sign up or sign in to the [Composio dashboard](https://dashboard.composio.dev/?cta_placement=atomic-agent-api-key). Copy your API key.
- In Atomic Agent, open the Integrations tab and select Composio. Select API key, press e, paste the key, and press Enter. The tools become available immediately, without a restart.
- Ask Atomic Agent to do something in Splice. It searches Composio for the right tool.
- On first use, open the sign-in link returned in the chat. Connect your Splice account, then return to Atomic Agent to continue.
### Headless setup
Add the following line to ~/.atomic-agent/.env, replacing YOUR_COMPOSIO_API_KEY with your key. Start Atomic Agent after saving the file.

```bash
COMPOSIO_API_KEY=YOUR_COMPOSIO_API_KEY
```

## What is the Splice MCP server, and what's possible with it?

The Splice MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Splice account. It provides structured and secure access so your agent can perform Splice operations on your behalf.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `SPLICE_MCP_CREATE_STACK` | Create stack | Create a stack from an existing sample. This is the ONLY tool that can use a previously found or selected sample as a seed — if the user wants to build a stack around a specific sample, you MUST use this tool (not prompt_to_stack). ROUTING RULE: Any request like 'create a stack from this sample', 'build around this loop', 'use this as a seed', or referencing a specific asset UUID MUST use this tool. The seed sample MUST be a loop (not a one-shot). If the user asks to build a stack from a one-shot, do NOT silently search for loops. Instead, FIRST explain to the user that one-shots cannot be used as stack seeds because stacks require loopable samples to layer together, THEN offer to find similar loops that match the style or character of the one-shot they liked. Uses the loop as the starting layer and generates a full multi-layer stack of compatible samples around it. |
| `SPLICE_MCP_DESCRIBE_A_SOUND` | Describe a sound | Search the Splice catalog for sounds matching a natural language description. Returns sample metadata including BPM, key, tags, duration, and Splice links. Use this to BROWSE and EXPLORE individual sounds -- when the user wants to find, preview, or discover specific samples, loops, or one-shots. Do NOT call this tool alongside prompt_to_stack for the same request. If the user wants a complete multi-track beat or arrangement, use prompt_to_stack instead. Present ALL results to the user exactly as numbered; do not filter, omit, or reorder any results — let the user decide which sounds are relevant. IMPORTANT: One-shots CANNOT be used as seeds to create stacks — only loops can. If the user searched for one-shots and then asks to create a stack from those results, you MUST explicitly tell the user that one-shots cannot be used to create stacks and offer to search for similar loops instead. Do NOT silently pivot to loops. |
| `SPLICE_MCP_DOWNLOAD_ASSET` | Download asset | Purchase and get a presigned download URL for a sound from the Splice catalog. The server returns a presigned URL — it does not write files. If the client has local filesystem access, it should fetch the URL and save the file to download_path; otherwise omit download_path and present the URL to the user. IMPORTANT: The first time an asset is downloaded it spends one of the user's credits. Subsequent downloads of the same asset are free. Always confirm with the user before calling this tool. The URL expires quickly — always display the file name alongside the download URL so the user can identify and access their file. |
| `SPLICE_MCP_PROMPT_TO_STACK` | Prompt to stack | Generate a complete multi-track arrangement of compatible samples from a text description. Use this ONLY when the user describes a sound from scratch without referencing a specific existing sample. This tool does NOT accept a sample UUID as input -- it creates a stack entirely from a text prompt. ROUTING RULE: If the user says anything like 'create a stack from this sample', 'build a stack around this loop', or 'use this as a seed', you MUST use create_stack instead -- even if the user also provides a text description of the desired sound. Do NOT call this tool alongside describe_a_sound for the same request. If the user just wants to browse or find individual sounds, use describe_a_sound instead. Uses AI to interpret your prompt, select appropriate instrument layers (drums, bass, keys, etc.), and filters, and find matching harmonically coherent samples. BPM GUIDANCE: Always include a target BPM in the prompt AND set bpm_min/bpm_max to avoid extreme time-stretching. If the user specifies a genre but not a BPM, infer the range from the genre. Optionally generates a public shareable URL. |
| `SPLICE_MCP_SHARE_STACK` | Share stack | Generate a public shareable URL for an existing stack. Takes a stack UUID (from a previous create call) and returns a shareable link. |
| `SPLICE_MCP_UPDATE_STACK` | Update stack | Modify an existing stack. Use this tool to add, remove, or swap sounds in a stack, rename it, or change its BPM. LAYER LIMIT: Stacks have a maximum of 8 layers. Adding layers beyond this limit will fail. If the stack already has 8 layers, remove existing layers before adding new ones. Required parameter: stack_uuid (the UUID, not a URL). To remove layers, pass their UUIDs via remove_layer_uuids. At least one modification must be provided. When adding or swapping layers, PREFER add_compatible_layers and swap_compatible_layers — these find harmonically compatible samples that fit the existing stack. Only use add_asset_uuids or swap_layers when the user has explicitly chosen a specific sample to use. DRUMS: When adding drums, ALWAYS include the 'grooves' tag in the tag_filter (e.g. '(hip hop \|\| trap) && grooves', 'house && grooves') to get complete drum patterns (kick + snare + hats combined). Without the 'grooves' tag, the search returns isolated single-hit layers (just kicks, just snares, etc.) instead of full drum loops. Only omit 'grooves' if the user explicitly asks for an isolated drum element. Optional tag filter DSL to narrow sample selection. Prefer && (intersection) so all tags must match for precise results; fall back to \|\| (union) only if intersection returns too few results. Valid tags per layer type: drums: grooves, house, hip hop, techno, tech house, hats, live sounds, trap, deep house, kicks, edm, pop, downtempo, snares, percussion, rnb; percussion: live sounds, house, techno, hip hop, tech house, cinematic, shakers, trap, downtempo, acoustic, deep house, edm, synth, pop; bass: synth, house, sub, techno, hip hop, tech house, edm, electric, trap, deep house, drum and bass, rnb, downtempo, dubstep; guitar: electric, live sounds, electric guitar, hip hop, acoustic, rnb, pop, rock, trap, soul, wet, funk, downtempo, lo-fi hip hop, dry; keys: piano, hip hop, electric piano, synth, rnb, soul, trap, live sounds, house, downtempo, pop, lo-fi hip hop, organ, deep house, jazz; strings: live sounds, hip hop, organic, acoustic, cinematic, synth, cello, folk, dry, clean, violin, trap, rnb, soul; vocals: female, pop, wet, edm, live sounds, dry, male, rnb, house, hip hop, pitched, cinematic, trap, soul, future bass; chords: synth, keys, hip hop, rnb, piano, guitar, live sounds, soul, trap, house, electric, pop, electric piano, downtempo, lo-fi hip hop; leads: synth, house, edm, wet, trap, techno, hip hop, pop, vocals, tech house, progressive house, rnb, guitar, deep house, trance; pads: synth, hip hop, house, downtempo, trap, techno, ambient, rnb, cinematic, pop, synthwave, deep house, edm, tech house, soul; brass-and-woodwinds: live sounds, hip hop, trap, organic, synth, cinematic, dry, acoustic, jazz, rnb, soul, clean; synth: house, techno, hip hop, trap, tech house, edm, deep house, downtempo, pop, rnb, progressive house, sub, wet, synthwave, future bass; fx: synth, techno, house, cinematic, ambient, edm, hip hop, vocals, percussion, downtempo, tech house, live sounds, trap, pop |

## Supported Triggers

None listed.

## Troubleshooting

### Why is my API key rejected?

Copy the key directly from the Composio dashboard. Atomic Agent requires ASCII characters because it sends the key in an HTTP header. Remove any extra characters introduced when copying.

### Why are Composio tools unavailable after saving a key?

Check that you use Atomic Agent v0.5.6 or later and that Composio is enabled in your configuration. A "composio": { "enabled": false } setting disables the integration while keeping the saved key on disk.

### Does Composio have a free plan?

The Hobby plan includes 100,000 tool calls per month. Composio-managed OAuth apps have a lower included allowance. See [Composio pricing](/pricing) for the current limits that apply to your connection.

## Complete Code

None listed.

## Conclusion

### Use Splice from Atomic Agent
With your account connected, ask Atomic Agent to work with Splice in natural language. You can connect more apps through the same Composio integration as you need them.
Visit the [Atomic Agent website](https://atomicagent.io/?cta_placement=atomic-agent-site) or inspect the [Atomic Agent source code](https://github.com/AtomicBot-ai/atomic-agent?cta_placement=atomic-agent-repo).

## How to build Splice MCP Agent with another framework

- [ChatGPT](https://composio.dev/toolkits/splice_mcp/framework/chatgpt)
- [Claude Cowork](https://composio.dev/toolkits/splice_mcp/framework/claude-cowork)
- [Hermes](https://composio.dev/toolkits/splice_mcp/framework/hermes-agent)

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## Frequently Asked Questions

### What are the differences in Tool Router MCP and Splice MCP?

With a standalone Splice MCP server, the agents and LLMs can only access a fixed set of Splice tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Splice and many other apps based on the task at hand, all through a single MCP endpoint.

### Can I use Tool Router MCP with Atomic Agent?

Yes, you can. Atomic Agent fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Splice tools.

### Can I manage the permissions and scopes for Splice while using Tool Router?

Yes, absolutely. You can configure which Splice scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

### How safe is my data with Composio Tool Router?

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Splice data and credentials are handled as safely as possible.

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