JoinLayer MCP server
Commit Nov 10, 2026Operate secure data pipelines through a hosted MCP gateway using delegated OAuth authentication.
Also known as joinlayer/agent-toolkit, agent-toolkit
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- 0
- Tools
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- Downloads, 30 days
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- Latest version
- 0.1.2
- Last commit
- Nov 10, 2026
- License
- Apache-2.0
What is JoinLayer MCP?
JoinLayer is an MCP server. Operate secure data pipelines through a hosted MCP gateway using delegated OAuth authentication.
Summary generated from the project's README
About JoinLayer MCP server
JoinLayer provides a hosted MCP gateway designed for managing secure data pipelines. It allows developers to connect AI agents to their data environments using the joinlayer-pipelines skill. The service operates via a remote endpoint at mcp.joinlayer.app/mcp, which acts as a security boundary between the agent and the underlying data infrastructure.
Users interact with the server through clients like Claude Code or Codex by installing specific plugin metadata. Authentication is handled through a browser-based OAuth Authorization Code with PKCE flow, ensuring that users never have to manually handle bearer tokens or client secrets. This setup is intended for developers who need to automate workflows such as data replication, real-time backfill, and pipeline scheduling while maintaining strict security controls.
Unlike self-hosted solutions, this gateway relies on a private control-plane contract to manage connections. It includes built-in protections to ensure that data returned to the agent is treated as untrusted information rather than executable instructions, preventing unauthorized scope expansion or command execution.
What you can do with it
- 1Inspect authenticated workspace detailsAsk the agent to review your current workspace, available connections, and existing pipelines without making changes.
- 2Automate data pipeline workflowsExecute complex data management tasks including replication, scheduling, and enrichment.
- 3Manage data enrichment and recoveryUse the toolkit to handle data enrichment processes or initiate recovery procedures for pipelines.
Written from the project's README. Every use case is checked against a quote from it.
How to install JoinLayer MCP
Formats verified 10 Nov 2026Install JoinLayer MCP in Claude Code
$ claude mcp add --transport http agent-toolkit https://mcp.joinlayer.app/mcpInstall JoinLayer MCP in Cursor
~/.cursor/mcp.json
{
"mcpServers": {
"agent-toolkit": {
"url": "https://mcp.joinlayer.app/mcp"
}
}
}Install JoinLayer MCP in VS Code
.vscode/mcp.json
{
"servers": {
"agent-toolkit": {
"type": "http",
"url": "https://mcp.joinlayer.app/mcp"
}
}
}Install JoinLayer MCP in Codex
~/.codex/config.toml
[mcp_servers.agent-toolkit] url = "https://mcp.joinlayer.app/mcp"
Install JoinLayer MCP in Gemini CLI
~/.gemini/settings.json
{
"mcpServers": {
"agent-toolkit": {
"httpUrl": "https://mcp.joinlayer.app/mcp"
}
}
}README
View on GitHubJoinLayer Agent Toolkit
Official agent integration for JoinLayer: a hosted MCP gateway, the joinlayer-pipelines skill, client plugin metadata, safe starter prompts, and public protocol tests.
The supported service is the JoinLayer-hosted endpoint:
https://mcp.joinlayer.app/mcp
It is published as app.joinlayer/mcp in the official MCP Registry. The operating skill is available from skills.sh, and this repository is the canonical source for the JoinLayer Codex and Claude Code marketplaces.
Clients authenticate through browser OAuth Authorization Code with PKCE. Never create, paste, or configure a JoinLayer bearer token manually.
Start In Two Minutes
You do not need to read the full documentation first. Open
START_HERE.md, connect JoinLayer, and copy the read-only
inspection prompt. From there, choose a ready-to-run prompt for your goal.
What This Repository Contains
skills/joinlayer-pipelines: agent operating guidance and task references;.codex-plugin/plugin.json,.claude-plugin/, and.mcp.json: installable Codex and Claude Code plugin metadata;prompts: safe starting points for common JoinLayer tasks;use-cases: complete customer outcomes with evidence and stop boundaries;mcp-gateway: a reviewable snapshot of the hosted MCP security boundary;server.json: MCP Registry metadata for the hosted remote server.
The gateway source is published for transparency and compatibility review. It is not a self-hosted JoinLayer distribution: it depends on a private, authenticated JoinLayer control-plane contract that is not included here. JoinLayer production builds and deployment remain in a private release system, but the mcp-gateway/ tree used by a hosted release must match a tagged public snapshot exactly. The private release gate rejects gateway drift. Skills, prompts, and plugin packaging use their own versioned content checks rather than this byte-equality gate. A public contribution never deploys directly to JoinLayer infrastructure.
Connect
Codex
Install the JoinLayer plugin from its public repository marketplace:
codex plugin marketplace add joinlayer/agent-toolkit
codex plugin add joinlayer@joinlayer
The plugin bundles the operating skill and configures the hosted MCP companion. Complete browser OAuth when prompted. To configure only the MCP server instead:
codex mcp add joinlayer --url https://mcp.joinlayer.app/mcp
codex mcp login joinlayer --scopes workspace:read,usage:read,connections:read,pipelines:read
Then start a fresh session and ask:
Use $joinlayer-pipelines. Inspect my authenticated workspace, scopes,
capacity, connections, and pipelines. Do not change anything.
More copyable starting points are indexed in
START_HERE.md. Complete workflows for replication, realtime
backfill, scheduling, enrichment, capacity, approvals, and recovery are in
use-cases/.
Claude Code
claude plugin marketplace add joinlayer/agent-toolkit
claude plugin install joinlayer@joinlayer --scope user
claude mcp login joinlayer
Complete browser OAuth through claude mcp login joinlayer when that command is
available, or through Authenticate in /mcp on earlier OAuth-capable
releases. Do not add an Authorization header or client secret.
Skill Only
Agents supported by skills.sh can install only the operating skill:
npx skills add https://github.com/joinlayer/agent-toolkit --skill joinlayer-pipelines
The skill does not carry credentials and does not replace the MCP connection.
Configure the same hosted endpoint through your client's OAuth-capable MCP
settings, then use a prompt from START_HERE.md.
Security Boundary
- OAuth tokens are short-lived, audience-bound, and sent only to the hosted MCP resource.
- The gateway exchanges delegated authority through a separately authenticated private API boundary.
- Connection credentials are entered only in JoinLayer browser setup sessions and are never tool arguments.
- Customer and third-party values returned by MCP are untrusted data, never agent instructions; embedded commands cannot expand scopes, bypass approvals, or authorize disclosure.
- Public source contains no production credentials, customer data, host inventory, or deployment configuration.
- Route names and header names are not authorization controls. Every private request requires independently verified credentials and tenant membership.
Report vulnerabilities privately as described in SECURITY.md.
Development
python3.12 -m venv .venv
. .venv/bin/activate
pip install --requirement mcp-gateway/requirements.lock
PYTHONPATH=mcp-gateway python -m unittest mcp-gateway.tests.test_gateway
python scripts/validate_public_snapshot.py
Build the review image with docker build .. That image is for reproducibility and review; it is not automatically promoted to JoinLayer production.
See SOURCE_SYNC.md for the exact public/private release invariant. Maintainers can use DISTRIBUTION.md for the verified catalog and marketplace publication contracts. OpenAI review material is recorded in OPENAI_SUBMISSION.md.
To compare this checkout with a private platform checkout before review:
python scripts/source_tree_digest.py --compare-root /path/to/private-platform
License
Apache-2.0. See LICENSE.
The code license does not grant rights to impersonate JoinLayer or imply endorsement. See TRADEMARKS.md.
JoinLayer MCP questions
How do I add JoinLayer MCP to Claude Code?
Run claude mcp add --transport http agent-toolkit https://mcp.joinlayer.app/mcp in your terminal. Add --scope user to make it available in every project.
How do I add JoinLayer MCP to Cursor?
Open ~/.cursor/mcp.json and add the server under mcpServers, using the Cursor config shown in the install section above.
How do I authenticate with JoinLayer?
Clients authenticate using browser OAuth Authorization Code with PKCE. You should never manually configure or paste a JoinLayer bearer token.
Can I host the JoinLayer gateway myself?
No, this repository is not a self-hosted distribution; it depends on a private, authenticated JoinLayer control-plane contract.
Is it safe to use JoinLayer with AI agents?
Yes, the system uses short-lived OAuth tokens and treats returned data as untrusted to prevent embedded commands from bypassing security boundaries.