Toolcallwitness MCP

What toolcallwitness-mcp MCP server does

The toolcallwitness-mcp MCP server connects an MCP client to the hosted ToolCall Witness service at https://toolcallwitness.clauxel.com/mcp. Its purpose is to provide a witness layer around AI agent tool calls, including receipts, approval evidence, argument redaction, result summaries, and audit-oriented exports.

Four tools are available through MCP:

• create_witness_receipt creates a witness receipt for a tool call.
• check_approval_rule checks an approval rule.
• summarize_risk_timeline produces a risk timeline summary.
• export_audit_receipt exports an audit receipt.

These capabilities fit workflows that need a record of agent actions or a way to prepare tool-call activity for review.

How it works

The service is hosted remotely rather than shipped as executable production source in this repository. An MCP client sends JSON-RPC requests to the /mcp endpoint using Streamable HTTP. Each production request must include a bearer token in the Authorization header:

Authorization: Bearer <token>

The repository describes the project as a documentation and directory-submission reference for the hosted service. It does not contain the private production implementation. Browser requests without authentication return a JSON error rather than internal service details.

Setup and configuration

To use the toolcallwitness-mcp MCP server, open the product website, select a plan, and create or request an API token. Configure an MCP client that supports remote Streamable HTTP servers with the service endpoint and token, then send JSON-RPC requests.

The public endpoint is:

https://toolcallwitness.clauxel.com/mcp

Authentication is configured as a request header, not as a documented server-side environment variable. The README does not provide client-specific configuration files or a local installation procedure.

Tools and capabilities

The toolcallwitness-mcp MCP server exposes a compact set of tools focused on evidence and review of agent tool calls:

• Create witness receipts for calls that need a recorded outcome.
• Evaluate approval rules before or around an agent action.
• Summarize a timeline of risk-related activity.
• Export audit receipts for downstream review.
• Support argument redaction and result summaries as part of the hosted receipt workflow.

The available material does not define each tool's input schema, output schema, approval-rule language, or receipt format, so those details should be confirmed through the service's MCP tool definitions.

Limitations and notes

The toolcallwitness-mcp MCP server is a paid hosted service. Production access depends on a bearer token issued through the product website, and the repository does not provide a local server implementation. Client compatibility therefore depends on support for remote Streamable HTTP MCP servers and bearer-token configuration.

The README does not identify a specific license for the repository or document retention, pricing details, rate limits, or data-handling policies. Review the product site and server card before adopting it for sensitive or regulated tool-call data.