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klanex

Official registry Security

Reliable async execution for agent tool calls: schema gating, retries, idempotency, audit trail.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http klanex 'https://api.klanexai.com/mcp' --header 'X-API-Key: <klanex API key (klx_live_... for production; free klx_test_... sandbox keys work at https://api.sandbox.klanexai.com/mcp)>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "klanex": {
            "type": "http",
            "url": "https://api.klanexai.com/mcp",
            "headers": {
                "X-API-Key": "<klanex API key (klx_live_... for production; free klx_test_... sandbox keys work at https://api.sandbox.klanexai.com/mcp)>"
            }
        }
    }
}
NPM package klanex-mcp
Claude Code 
claude mcp add klanex -e 'KLANEX_API_KEY=<your klanex_api_key>' -- npx -y klanex-mcp@0.1.0
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "klanex": {
            "command": "npx",
            "args": [
                "-y",
                "klanex-mcp@0.1.0"
            ],
            "env": {
                "KLANEX_API_KEY": "<your klanex_api_key>"
            }
        }
    }
}

Environment variables

  • KLANEX_API_KEY required secret klanex API key; klx_test_... keys route to the sandbox automatically

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. klanex MCP server
  2. Connect (hosted, recommended)
  3. Connect (stdio shim)
  4. Tools
  5. Why this beats calling APIs directly
  6. License

klanex MCP server

Reliable execution for agent tool calls, as an MCP server.

klanex is an async execution layer between an agent's tool-use intents and real third-party APIs: it schema-gates hallucinated payloads before anything runs, absorbs rate limits and outages with retries/backoff/circuit breakers, encrypts credentials, keeps an audit trail, and reports back via signed webhooks. With this MCP server, an agent submits a call once — klanex makes sure it lands.

Failures come back written for the model: every error carries an llm_hint telling the agent exactly what to fix (or that klanex is already handling it), so agents self-correct instead of guessing.

klanex's MCP server is hosted — no install needed if your client supports HTTP transports:

EndpointEnvironmentKeys
https://api.klanexai.com/mcpproductionklx_live_…
https://api.sandbox.klanexai.com/mcpsandbox (free to try)klx_test_…

Get an API key at klanexai.com — sandbox keys are free.

Claude Code

claude mcp add --transport http klanex https://api.klanexai.com/mcp \
  --header "X-API-Key: klx_live_..."

Cursor / Windsurf / VS Code (mcp.json)

{
  "mcpServers": {
    "klanex": {
      "url": "https://api.klanexai.com/mcp",
      "headers": { "X-API-Key": "klx_live_..." }
    }
  }
}

Authorization: Bearer klx_... works too, for clients that can only set that header.

Connect (stdio shim)

For clients that only speak stdio (e.g. Claude Desktop), this package proxies stdio to the hosted endpoint:

{
  "mcpServers": {
    "klanex": {
      "command": "npx",
      "args": ["-y", "klanex-mcp"],
      "env": { "KLANEX_API_KEY": "klx_live_..." }
    }
  }
}

The shim routes by key prefix — klx_test_… keys go to the sandbox automatically. Set KLANEX_MCP_URL to override.

Tools

ToolWhat it does
executeSubmit an HTTP call for reliable async execution: optional JSON Schema gate, retries/backoff/circuit breakers, idempotency keys, human approval gates, encrypted credentials. wait_seconds blocks up to 55s for the terminal result.
get_executionCurrent status, attempts, target response, or classified error for an execution.
list_executionsThe account's executions, filterable by status/time, paginated.
replay_executionRe-run a terminal execution byte-exact — outage recovery without re-prompting the LLM.
get_usagePlan and current-month usage/quota.
list_connectionsStored credential connections (token vault) to reference via connection_id — so secrets never pass through model context.

Why this beats calling APIs directly

  • Hallucinated payloads are rejected before they execute — pass payload_schema and mismatches return synchronously with a correction hint.
  • Transient failures are not the agent's problem — 429s, timeouts, and 5xxs are retried with backoff behind a circuit breaker; the agent does nothing.
  • A network blip can never double-execute a refund — idempotency_key makes submits safe to retry.
  • Destructive actions can wait for a human — requires_approval pauses execution for an approve/reject decision (API, dashboard, or Slack buttons).
  • Credentials stay out of model context — store them once as a connection; klanex injects them at execution time.

Full API docs: api.klanexai.com/docs

License

MIT

Frequently asked questions

What is klanex?

Reliable async execution for agent tool calls: schema gating, retries, idempotency, audit trail.

How do I install klanex?

It runs as a remote server. In Claude Code: claude mcp add --transport http klanex 'https://api.klanexai.com/mcp' --header 'X-API-Key: <klanex API key (klx_live_... for production; free klx_test_... sandbox keys work at https://api.sandbox.klanexai.com/mcp)>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does klanex need an API key?

Yes. It expects KLANEX_API_KEY, X-API-Key, which you set in its configuration.

Is klanex open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains klanex?

It is published by chrassy. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.