Documentation

Overview

rx7db is an MCP server for the Mazda RX-7 FD3S (1992–2002). Each tool call runs an internal Claude agent — billed to your own Anthropic API key — that researches the answer against a private knowledgebase (the factory service manual, the Power FC / PFC ecosystem manuals, and synthesized tuning and build guides) plus current community sources. You only ever see the synthesized answer, including cited diagram images where relevant — the knowledgebase itself is never exposed directly.

Getting started

Claude Code

Add rx7db as an MCP server, supplying your own Anthropic API key:

claude mcp add --transport http rx7 https://mcp.rx7db.com/mcp \
  --header "x-api-key: sk-ant-..."

Answers can take a few minutes. If your client times out, raise its MCP tool timeout — in Claude Code, set the MCP_TIMEOUT and MCP_TOOL_TIMEOUT environment variables.

Raw HTTP / custom MCP clients

rx7db speaks MCP over streamable HTTP — any MCP-compatible client that lets you set a custom header can connect directly with the same x-api-key approach:

curl -N https://mcp.rx7db.com/mcp \
  -H "x-api-key: sk-ant-..." \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize", ... }'

claude.ai, ChatGPT, and other web AI interfaces

Not supported yet. The x-api-key header approach above only works with Claude Code (and other clients that let you configure raw headers) — web AI products don't currently expose a way to attach a custom header to an MCP connector, so there's no way to add rx7db to claude.ai, ChatGPT, or similar interfaces today.

An OAuth-based connector flow is planned to remove this restriction. Once it lands, this section will be replaced with setup steps.

Tools

Tool	Use for
`troubleshoot`	Diagnose a symptom or malfunction and walk through the fix
`cooling`	Overheating, temperature swings, coolant loss, and cooling-system health
`job_planner`	Plan a known repair, service, or install: parts, tools, torques, procedure, verification
`tune`	Tuning: AFR targets, timing, ECU settings, tuning symptoms
`wiring`	Electrical diagnosis: circuit traces, pinouts, wire colors, multimeter steps (returns diagram images)
`vacuum`	Vacuum/pressure hose routing, the "rat's nest", solenoid/actuator testing, sequential-turbo control (returns routing diagrams)
`build_planner`	Plan a modification sequence toward a target power level
`turbo_sizing`	Airflow/WHP math for turbo and boost combinations
`wheel_fitment`	Validate wheel width/offset, tire size, and suspension/fender/brake clearance
`find_parts`	Locate OEM or aftermarket parts, with live supersession/stock lookups
`ask`	Any other FD3S question (specs, maintenance, how systems work)

All tools share the same arguments: question (required), session_id (to continue a conversation — every response ends with one; pass it back to any rx7 tool to keep full context, e.g. trace a circuit with wiring then ask find_parts for "that relay"), and vehicle_config (see Vehicle config). Sessions are bound to the API key that created them and expire after 7 days of inactivity.

Diagram images are cited inline in the answer text as a link to the hosted image (click to view). Inline image embedding for web/app clients is planned alongside the OAuth connector support described above.

Vehicle config

Pass vehicle_config — markdown describing your car (year/market, engine/turbo setup, ECU, supporting mods) — to get answers tailored to it. Call set_vehicle once to save it so every future call uses it automatically, without resending it; get_vehicle and clear_vehicle manage the saved profile.

Example:

# Vehicle information

## Summary

2002 RX-7 Type RB-S
JDM (RHD)
Innocent Blue Mica

## Modifications

### Exterior

Advan GT wheels, 17x9.5+45
Advan Neova AD09 tires 255/45/17
Rays duraluminum forged lugs

### Interior

Kenwood eXcelon DMX958XR head unit

### Chassis

Banzai Racing crossmember brace
Super Now engine mounts
Super Now diff mounts

### Suspension

Ohlins coilovers (version unknown, likely from the mid-2010s)
Megan Racing rear toe links
1320 Performance front end links

### Engine

GReddy TD06-20G single turbo conversion
GReddy Airinx S intake
Custom bar and plate v-mount intercooler
Tial external wastegate, recirculated (brand is a guess based on apperance)
RE-Amemiya 90mm Dolphin tail exhaust and resonated mid-pipe
GESi High Flow metal core Catalytic Converter

### Cooling

Koyo Radiator v-mount
Mishimoto radiator fans

### Electrical

Antigravity ATX20HD lithium battery
JP3 battery relocation kit
JP3 Alternator Voltage Boost Adapter Harness

### Engine Management

Apexi Power FC ECU
PFC Master ECU
HKS ECV-S Boost Controller

### Miscellaneous

Innovate LC-2 Wideband sensor
Radium FD3S oil catch can
EBC Yellow stuff brake pads and GD series rotors
Stainless steel brake and clutch line

Costs & timing

Each tool call runs an internal research agent billed to your own Anthropic API key — expect roughly $0.05–$0.50 per call, taking up to a few minutes depending on the question.