AI Agents with MCP Tools

all.source includes 27 MCP (Model Context Protocol) tools that enable AI agents like Claude to interact with your event store autonomously.

What is MCP?

MCP is Anthropic's open protocol for AI tool use. It lets AI assistants call external tools and APIs in a standardized way. all.source implements an MCP server that exposes our entire API as tools.

Available Tools

Event Management

mcp_ingest_event - Create new events
mcp_query_events - Search events with filters
mcp_get_entity_state - Reconstruct entity state
mcp_time_travel - Query state at any timestamp

Projections

mcp_create_projection - Define materialized views
mcp_list_projections - See all projections
mcp_rebuild_projection - Reprocess from scratch

Schema Management

mcp_register_schema - Add JSON schemas
mcp_validate_event - Check event against schema
mcp_list_schemas - Browse schema registry

Analytics

mcp_event_frequency - Time-bucketed counts
mcp_correlation_analysis - Find related events
mcp_stats_summary - Aggregate statistics

Claude Desktop Setup

Add all.source to your Claude Desktop config:

{
  "mcpServers": {
    "allsource": {
      "command": "allsource-mcp",
      "args": ["--url", "http://localhost:3900"],
      "env": {
        "ALLSOURCE_API_KEY": "your-api-key"
      }
    }
  }
}

Example Conversations

You: "Show me all user signups from last week"

Claude: Uses mcp_query_events to search for user.signed_up events

"Found 847 signup events from the past 7 days. The peak was Tuesday with 156 signups. Here's the distribution by day..."

You: "Create a projection that counts events by type"

Claude: Uses mcp_create_projection

"I've created a projection called 'event_type_counter' that will maintain running counts for each event type. It's now processing historical events and will be ready in a few seconds."

You: "What was the order state when the payment failed?"

Claude: Uses mcp_time_travel

"At the moment of payment failure (2026-02-05T10:30:00Z), the order state was: status='pending', items=[...], total=$127.50. The payment attempt was the 3rd event in this order's history."

Why This Matters

Traditional APIs require developers to write integration code. With MCP, AI agents can:

Explore your data autonomously
Create projections on demand
Run ad-hoc analytics
Debug issues with natural language

Your event store becomes a conversational interface.

Get Started

The MCP server is included with all.source. Enable it in your config:

[mcp]
enabled = true
port = 3901

Start building with AI