b60459844cAdds Peder's Dev Summit talk (Context Middleware for MCP: From Enterprise Needs To Protocol Extension) to the README Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
83 lines
3.9 KiB
Markdown
83 lines
3.9 KiB
Markdown
# MCP Interceptors (Experimental Extension)
|
|
|
|
> #### **Status:** Experimental. This work is for prototyping and feedback only, and is not an accepted or official MCP extension.
|
|
|
|
This repository provides a multi-language reference implementation of the proposed interceptor extension for the Model Context Protocol (MCP), as described in [SEP-2624](https://github.com/modelcontextprotocol/modelcontextprotocol/issues/2624).
|
|
|
|
**Charter:** [modelcontextprotocol.io/community/working-groups/interceptors](https://modelcontextprotocol.io/community/working-groups/interceptors) — the Interceptors Working Group's mission, scope, leadership, and active work items.
|
|
|
|
**Meeting notes:** [Meeting Notes - Interceptors WG](https://github.com/modelcontextprotocol/modelcontextprotocol/discussions/categories/meeting-notes-interceptors-wg) in the spec repo. The April 30, 2026 meeting predates that category and is in [this repository's discussions](https://github.com/modelcontextprotocol/experimental-ext-interceptors/discussions), along with copies of the April 23 and May 14 notes.
|
|
|
|
|
|
## Implementations
|
|
|
|
| Language | Directory | Package | Status |
|
|
|----------|-----------|---------|--------|
|
|
| C# | `csharp/sdk/` | `ModelContextProtocol.Interceptors` | In Progress |
|
|
| Go | `go/sdk/` | `github.com/modelcontextprotocol/ext-interceptors/go/sdk` | Planned |
|
|
| Python | `python/sdk/` | `mcp-ext-interceptors` | Planned |
|
|
| TypeScript | `typescript/sdk/` | `@ext-modelcontextprotocol/interceptors` | Planned |
|
|
|
|
|
|
## CI/CD
|
|
|
|
This monorepo uses **path-based CI workflows** to efficiently test only what changes:
|
|
|
|
### How It Works
|
|
|
|
1. **Language-specific workflows** (`csharp.yml`, `python.yml`, `go.yml`, `typescript.yml`)
|
|
- Only trigger when their language directory or workflow file changes
|
|
- Run all tests, linting, and checks for that language
|
|
|
|
2. **Status check workflow** (`status-check.yml`)
|
|
- Runs on every PR to verify required checks passed
|
|
- Determines what needs to pass based on which files changed
|
|
- This is the only required check in branch protection
|
|
|
|
### Examples
|
|
|
|
- Change `python/sdk/file.py` → Only Python CI runs → PR requires Python checks to pass
|
|
- Change both Go and TypeScript files → Both CIs run → PR requires both to pass
|
|
- Change only `README.md` → No language CIs run → PR can merge immediately
|
|
|
|
### Forcing All Checks
|
|
|
|
To run all language checks regardless of changed files:
|
|
- **In a PR**: Comment `/test all` (only works for repo owners/members/collaborators)
|
|
- **Manually**: Use GitHub Actions UI or CLI to trigger individual workflows
|
|
|
|
### Adding New Required Checks
|
|
|
|
1. **Add your check** to the appropriate language workflow (e.g., `python.yml`):
|
|
```yaml
|
|
python-security-scan:
|
|
name: "Security Scan"
|
|
runs-on: ubuntu-latest
|
|
steps:
|
|
- name: Run security checks
|
|
run: # your commands here
|
|
```
|
|
|
|
2. **Update the status check** in `.github/workflows/status-check.yml`:
|
|
```javascript
|
|
const requiredChecks = {
|
|
python: [
|
|
'Python CI / Linting',
|
|
'Python CI / Unit Tests (3.10)',
|
|
// ... existing checks ...
|
|
'Python CI / Security Scan' // ← Add your new check
|
|
],
|
|
```
|
|
|
|
3. **Submit PR** - Your new check is now required for all relevant changes!
|
|
|
|
## License
|
|
|
|
Apache License 2.0 - See LICENSE file for details
|
|
|
|
## Resources
|
|
|
|
- [Interceptor Framework Specification (SEP-2624)](https://github.com/modelcontextprotocol/modelcontextprotocol/issues/2624) - Full specification and design details
|
|
- [Model Context Protocol](https://modelcontextprotocol.io/specification)
|
|
- [Interceptors for MCP: A Production-Tested Standard for Agentic Middleware](https://www.youtube.com/watch?v=YOv1d7PVi8U) - Kurt Degiorgio & Cannis Chan (Bloomberg), MCP Dev Summit North America
|
|
- [Context Middleware for MCP: From Enterprise Needs To Protocol Extension](https://www.youtube.com/watch?v=-X5lx3IOu7M) - Peder Holdgaard Pedersen, MCP Dev Summit North America
|