Mirror of https://github.com/modelcontextprotocol/registry — A community driven registry service for Model Context Protocol (MCP) servers.
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3dc4f93370## Problem
Production deployment is failing with CrashLoopBackOff. Migration 008
fails with:
```
ERROR: column "status" of relation "servers" contains null values (SQLSTATE 23502)
```
## Root Cause
The migration extracts the `status` field from an unexpected location in
the data structure.
### Actual Data Structure (Before Migration)
In the current format, `status` is at the **top level** of the JSON, not
nested in official metadata:
```json
{
"name": "com.example/server",
"version": "1.0.0",
"status": "active", ← STATUS IS HERE (top level)
"_meta": {
"io.modelcontextprotocol.registry/official": {
"serverId": "uuid",
"publishedAt": "2025-09-01T00:00:00Z",
"isLatest": true
// NO STATUS FIELD HERE
}
}
}
```
For 120 out of 765 servers, the status field is **missing entirely**:
```json
{
"name": "com.biodnd/agent-ip",
"version": "0.1.2",
// ← NO STATUS FIELD AT ALL
"_meta": {
"io.modelcontextprotocol.registry/official": {
"serverId": "uuid",
"publishedAt": "2025-09-23T09:47:07Z",
"isLatest": true
// STILL NO STATUS FIELD HERE
}
}
}
```
### Original Migration Logic
```sql
IF official_meta IS NOT NULL THEN
UPDATE servers
SET
status = (official_meta->>'status'), -- Extracts NULL for all servers
```
**Result:**
- All 765 servers would have NULL status extracted
- Because `official_meta->>'status'` returns NULL (field doesn't exist
there)
- The migration tries to add `NOT NULL` constraint → fails
### Fixed Migration Logic
```sql
IF official_meta IS NOT NULL THEN
UPDATE servers
SET
status = COALESCE(NULLIF(rec.value->>'status', 'null'), 'active'),
```
**Result:**
- Extracts from top-level JSON where status actually exists
- `NULLIF(rec.value->>'status', 'null')` handles edge case of literal
string "null"
- `COALESCE(..., 'active')` provides fallback when status is missing
- All servers get valid status value
### Impact Breakdown
**645 servers with `"status": "active"`:**
- Before fix: Would extract NULL → migration fails
- After fix: Extracts "active" correctly
**120 servers with missing status field:**
- Before fix: Would extract NULL → migration fails
- After fix: Defaults to 'active' via COALESCE
## Example Servers with Missing Status
(First 9 discovered during investigation)
- com.biodnd/agent-ip
- io.github.jkakar/cookwith-mcp
- com.joelverhagen.mcp/Knapcode.SampleMcpServer
- io.github.Lyellr88/marm-mcp-server
- com.biodnd/agent-press
- io.github.timheuer/sampledotnetmcpserver
- io.github.CodeCraftersLLC/local-voice-mcp
- com.biodnd/agent-fin
- io.github.ruvnet/ruv-swarm
## Testing
Verified against production data (765 total servers):
- ✅ All servers have official metadata
- ✅ None have status in official metadata (expected)
- ✅ 645 have "status": "active" at top level
- ✅ 120 have missing status field (no field present)
- ✅ Fix extracts from correct location for all cases
## Impact
This unblocks production deployment. Once merged and released as v1.2.1,
the migration will:
1. Extract status from the correct location (top-level JSON)
2. Handle missing status fields with sensible defaults
3. Successfully add NOT NULL constraint
4. Allow pods to start normally
---
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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MCP Registry
The MCP registry provides MCP clients with a list of MCP servers, like an app store for MCP servers.
📤 Publish my MCP server | ⚡️ Live API docs | 👀 Ecosystem vision | 📖 Full documentation
Development Status
2025-09-08 update: The registry has launched in preview 🎉 (announcement blog post). While the system is now more stable, this is still a preview release and breaking changes or data resets may occur. A general availability (GA) release will follow later. We'd love your feedback in GitHub discussions or in the #registry-dev Discord (joining details here).
Current key maintainers:
- Adam Jones (Anthropic) @domdomegg
- Tadas Antanavicius (PulseMCP) @tadasant
- Toby Padilla (GitHub) @toby
Contributing
We use multiple channels for collaboration - see modelcontextprotocol.io/community/communication.
Often (but not always) ideas flow through this pipeline:
- Discord - Real-time community discussions
- Discussions - Propose and discuss product/technical requirements
- Issues - Track well-scoped technical work
- Pull Requests - Contribute work towards issues
Quick start:
Pre-requisites
- Docker
- Go 1.24.x
- golangci-lint v2.4.0
Running the server
# Start full development environment
make dev-compose
This starts the registry at localhost:8080 with PostgreSQL and seed data. The database uses ephemeral storage and is reset each time you restart the containers, ensuring a clean state for development and testing.
The setup can be configured with environment variables in docker-compose.yml - see .env.example for a reference.
Alternative: Running a pre-built Docker image
Pre-built Docker images are automatically published to GitHub Container Registry:
# Run latest stable release
docker run -p 8080:8080 ghcr.io/modelcontextprotocol/registry:latest
# Run latest from main branch (continuous deployment)
docker run -p 8080:8080 ghcr.io/modelcontextprotocol/registry:main
# Run specific release version
docker run -p 8080:8080 ghcr.io/modelcontextprotocol/registry:v1.0.0
# Run development build from main branch
docker run -p 8080:8080 ghcr.io/modelcontextprotocol/registry:main-20250906-abc123d
Available tags:
- Releases:
latest,v1.0.0,v1.1.0, etc. - Continuous:
main(latest main branch build) - Development:
main-<date>-<sha>(specific commit builds)
Publishing a server
To publish a server, we've built a simple CLI. You can use it with:
# Build the latest CLI
make publisher
# Use it!
./bin/mcp-publisher --help
See the publisher guide for more details.
Other commands
# Run lint, unit tests and integration tests
make check
There are also a few more helpful commands for development. Run make help to learn more, or look in Makefile.
Architecture
Project Structure
├── cmd/ # Application entry points
│ └── publisher/ # Server publishing tool
├── data/ # Seed data
├── deploy/ # Deployment configuration (Pulumi)
├── docs/ # Documentation
├── internal/ # Private application code
│ ├── api/ # HTTP handlers and routing
│ ├── auth/ # Authentication (GitHub OAuth, JWT, namespace blocking)
│ ├── config/ # Configuration management
│ ├── database/ # Data persistence (PostgreSQL)
│ ├── service/ # Business logic
│ ├── telemetry/ # Metrics and monitoring
│ └── validators/ # Input validation
├── pkg/ # Public packages
│ ├── api/ # API types and structures
│ │ └── v0/ # Version 0 API types
│ └── model/ # Data models for server.json
├── scripts/ # Development and testing scripts
├── tests/ # Integration tests
└── tools/ # CLI tools and utilities
└── validate-*.sh # Schema validation tools
Authentication
Publishing supports multiple authentication methods:
- GitHub OAuth - For publishing by logging into GitHub
- GitHub OIDC - For publishing from GitHub Actions
- DNS verification - For proving ownership of a domain and its subdomains
- HTTP verification - For proving ownership of a domain
The registry validates namespace ownership when publishing. E.g. to publish...:
io.github.domdomegg/my-cool-mcpyou must login to GitHub asdomdomegg, or be in a GitHub Action on domdomegg's reposme.adamjones/my-cool-mcpyou must prove ownership ofadamjones.mevia DNS or HTTP challenge
Community Projects
Check out community projects to explore notable registry-related work created by the community.
More documentation
See the documentation for more details if your question has not been answered here!