Rosentic
Rosentic · Coding
Rosentic is a verification tool for AI coding agent teams running multiple agents on the same repository. It works as a merge conflict checker: every pull request gets scanned against all active branches, and cross-branch conflicts surface before those branches merge. Think mismatched function signatures, broken API contracts, schema drift. The detection engine runs on your own runner.
About Rosentic
What Is Rosentic
Rosentic catches the conflicts that Git and standard CI miss. Git merges text, and CI tests each branch alone, so two agents can change the same API in different ways and both pass every check. Then they merge, and production breaks. Rosentic acts as a branch compatibility scanner, comparing each branch against every other active branch at the syntax-tree level and reporting the structural incompatibilities that could cause runtime errors once both sides land without any coordination.
The tool is agent-neutral and platform-neutral. It doesn't matter whether your pull requests come from Claude Code, Cursor, or a plain human developer. Rosentic doesn't use LLM inference either, so it's the same input, same output, every time. According to the company, the engine has been tested across 850+ repositories in 13 languages, which gives the deterministic claim some weight behind it.
The biggest limit is scope. Rosentic only looks at branches with commits in the last 30 days. Stale branches get skipped. So very old or dormant work falls outside a scan. It also reports conflicts rather than resolving them, and by default it runs in audit mode. A flagged conflict won't block a merge until you turn on enforce mode.
Still, as a pull request CI check, it fills a real gap that Git and ordinary CI leave open.
Getting Started
- Create the folder
.github/workflows/in your repository if it doesn't exist. - Add a file named
rosentic.ymland paste the provided YAML into it. That's the whole install for the GitHub Action. - Commit and push the file, then open any pull request targeting
main. Rosentic runs automatically and posts a comment with its findings. - Wait for the first scan, which takes about 60 seconds while the Docker image pulls. Later scans are faster because the index is cached.
- Review the conflict report, then switch the action to enforce mode when you're ready to block merges on conflicts.
Product Information
A quick look at Rosentic's pricing, supported platforms, and performance.
Best for
The users, tasks, and scenarios where this tool fits best.
Users
- Engineering teams running parallel coding agents
- Solo developers using AI assistants
- Platform and DevOps engineers
Tasks
- Catching API contract breaks before merge
- Scanning for schema drift
- Checking a file before you write it
Scenarios
- Multiple agents editing one service
- Reviewing a fast-moving monorepo
- Asking about repo state from your phone
Key features
Cross-Branch Conflict Detection
Rosentic scans every active branch pair instead of testing each branch alone. It looks for function signature mismatches, HTTP API contract breaks, GraphQL schema conflicts, typed contract breaks, and protobuf or gRPC message conflicts. Each finding points to a structural incompatibility that could throw a runtime error if both branches merge without coordination.
Runs on Your Own Runner
The scan happens on your infrastructure, not Rosentic's. Code is analyzed and discarded, never stored, and source never leaves the runner in any mode. Only anonymous scan metadata travels back: the repo name, conflict counts and verdicts, language and branch counts, and timing. So what does that leave on your machine? Nothing but the report.
MCP Server for Coding Agents
The rosentic-mcp package plugs the same check into an AI coding agent's work loop. Its tools include check_conflicts for a full repo scan, check_file for a pre-write advisory, explain_conflict for fix guidance, and list_branches to see active branches and their inferred agent. The install wires a pre-write advisory and a pre-push gate that fails closed on unsafe results.
Audit and Enforce Modes
New installs start in audit mode, where conflicts are reported but the check still passes, so merges are never blocked on day one. Once the team trusts the results, a one-line YAML change switches to enforce mode, which blocks merges when conflicts appear. The gate policy can be set to advisory or blocking.
Deterministic Engine, No LLM
The analyzer uses no machine learning inference. The company says the same input produces the same output every time, which makes results reproducible and easy to defend in a review. Parsing happens at the syntax-tree level across 13 languages, and files are deduplicated across branches so most are parsed once.
Stored History and Remote Access
Paid plans extend the memory layer. A free key keeps 3 repos and 30 days of history, while paid tiers move to 90 days across unlimited personal repos with search. The hosted remote endpoint adds run_status and which_lane tools, so you can ask any MCP client what's clear to land next.
Pros and cons
Pros
- Catches cross-branch conflicts that Git, standard CI, and single-PR review all miss.
- Detection stays free on every tier, including PR checks and scan receipts.
- Runs locally, so source code never leaves your own runner.
- Agent-neutral and deterministic, with no LLM guesswork in the results.
- Works inside coding agents through the MCP server, not just as a PR gate.
Cons
- Only branches with commits in the last 30 days are scanned, so dormant work is skipped.
- It reports conflicts but doesn't resolve them, and enforce mode takes a manual YAML edit.
- The free tier's 30-day history and 3-repo cap limit how far back you can look.
Frequently asked questions
Rosentic checks whether all the branches in a repository work together. It compares each active branch against every other one and reports structural conflicts, like two branches changing the same function signature in incompatible ways, before they merge and break main.
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