Kavach

Kavach is a flight recorder and replay tool that captures service crashes into fixtures for fast debugging and fix verification.

Kavach records inputs, clock reads, and random reads from a service to capture crashes into compact fixtures. When a step fails, it flushes a .kavach fixture that replays byte for byte in microseconds without requiring a broker, database, or network. It verifies candidate fixes against perturbed variants of the incident to ensure patches are general rather than narrow. The tool supports 12 languages via SDKs including Go, Python, TypeScript, Rust, Java, C and C++, Julia, Ruby, PHP, Elixir, Haskell, and OCaml. It includes a CLI, a Model Context Protocol server, and agent skills for AI-assisted coding and verification.

Kavach at a glance

Best for: Software engineer
Runs on: Linux, macOS, CLI, API, open source
Pricing: Free and open source under Apache 2.0
Released: October 2026
Category: AI coding tool
Website: github.com/kavachlabs/kavach

Key features

Record inputs and state reads
Replay crashes in microseconds
Verify fixes across incident variants
Check features against contracts
Support 12 language SDKs
Provide an MCP server with six tools
Run as a GitHub Action in CI

Use it for

Reproduce and fix service crashes
Verify bug fixes across variants
Build features contract-first
Run regression tests in CI

Alternatives to Kavach

New Relic — Unified visibility across applications, infrastructure, and AI models.
Replay — Explores apps autonomously and provides root cause analysis without writing tests.
Robusta — Reduces costs and noise by investigating unique incidents instead of raw alerts.
QApilot — Explores mobile apps and self-heals broken tests without scripts.
jevgrep — Reduces coding agent costs by providing targeted, relevant repository context.
Everframe — Captures session replays and device trails automatically on every platform, including TVs.
BugTape — Replays browser errors and failed requests for coding agents to fix automatically.
Dsh Infinite Gen 4 — It runs dual-layer prompt injection for deep security auditing and reverse engineering.
Dsh Infinite Gen 5 — Provides thirty-six professional reverse engineering tools and multi-engine support.
Metabob — Provides proactive debugging and enforces safe implementation patterns for AI tools.
Jevia — Routes coding tasks to the right model tier using verified outcomes.
Ranwhat — Audits coding agent actions and scans for secrets on your machine without telemetry.

All Kavach alternatives