# Heroku MCP Server (@heroku/mcp-server) - AgentBreakWatch Reference

> TL;DR Verdict: Heroku MCP Server (`@heroku/mcp-server`) is currently at v1.2.12 on NPM (published 2026-10-12), with a 90-day Stability Score of 86/100 (B+) and MEDIUM schema drift risk across 7 releases in the last 90 days. Built on MCP SDK (^1.26.0); recent release v1.2.12 (up from v1.2.11) updates Cloud & Infra MCP tool schemas and transport handling (7 releases in last 90d). Pin exact version v1.2.12 in .mcp.json to avoid silent parameter drift.

## Live Telemetry Metadata
- Canonical Page: https://agentbreakwatch.vercel.app/p/heroku-mcp-server
- Category Hub: https://agentbreakwatch.vercel.app/c/cloud-infra (Cloud, Kubernetes & Infrastructure MCP Servers Stability Index)
- Package Name: `@heroku/mcp-server`
- Registry: NPM (https://www.npmjs.com/package/@heroku/mcp-server)
- GitHub Repository: https://github.com/heroku/heroku-mcp-server
- Vendor: Heroku
- Latest Live Version: v1.2.12
- Published Date: 2026-10-12T15:48:52.492Z
- 90-Day Release Count: 7
- Direct Dependencies: 8
- License: Apache-2.0
- Stability Score: 86/100 (Grade B+)
- Schema Drift Risk: MEDIUM
- Recommended Exact Pin Command: `npx -y @heroku/mcp-server@1.2.12`
- Watched Symbols / MCP Tools: heroku-mcp-server, tools/list, tools/call
- Snapshot Timestamp: 2026-10-24T12:11:27.697Z

## Breaking Change & Schema Drift Summary
Built on MCP SDK (^1.26.0); recent release v1.2.12 (up from v1.2.11) updates Cloud & Infra MCP tool schemas and transport handling (7 releases in last 90d). Pin exact version v1.2.12 in .mcp.json to avoid silent parameter drift.

## Migration Diff: Before (Deprecated / Unpinned Pattern)
```
"heroku-mcp-server": {
  "command": "npx",
  "args": ["-y", "@heroku/mcp-server@latest"]
}
```

## Migration Diff: After (Verified v1.2.12 Pattern)
```
"heroku-mcp-server": {
  "command": "npx",
  "args": ["-y", "@heroku/mcp-server@1.2.12"]
}
```

## Recent Verified Releases
- v1.2.12 (published 2026-10-12) [LATEST]
- v1.2.11 (published 2026-10-06)
- v1.2.10 (published 2026-10-01)
- v1.2.9 (published 2026-09-24)
- v1.2.8 (published 2026-09-22)
- v1.2.7 (published 2026-09-03)