A CLI tool that replays any CI failure locally with full environment parity so you never push-and-wait to debug

Developers waste hours per week in a push-and-wait loop: a CI step fails in the cloud, they make a guess, push a commit, wait 8-15 minutes, repeat. The root problem is that no tool reproduces the exact container, env vars, secrets, and step context locally with enough fidelity to debug confidently. This CLI captures the full CI step graph, pulls it into a local container environment matching the runner, and replays failing steps instantly with an interactive shell so developers fix once and verify without touching the remote.

Demand Breakdown

407

Social Proof 2 sources

Ask HN: What do you still do manually in 2026 that should be automated? (CI/CD push-and-wait top response)

@SyntaxErrorist · 2026-05-07

300 HN

Ask HN: What developer tool do you wish existed in 2026? (CI parity + local runner top pain)

@allenleee · 2025-12-21

107

Gap Assessment

CompetitiveMultiple tools exist but differentiation opportunities remain

4 tools exist (act (nektos), Dagger, Tilt, Agent CI) but gaps remain: Poor fidelity on complex workflows: missing runner contexts, service containers often break, secrets injection is manual, and environment variables from the cloud runner are not replicated. Actively under-maintained. Developers report it silently passes locally while CI fails in cloud.; Requires rewriting pipelines from scratch in Dagger's SDK. Does not replay existing GitHub Actions or GitLab CI YAML failures. Teams must migrate their entire pipeline, which is a high-adoption-cost blocker for the debugging use case..

Features8 agent-ready prompts

CI step graph capture and export

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Exact-environment local container launch

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Failing step auto-replay with diff output

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Service container and dependency spin-up

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Secret and env var management

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Artifact and cache layer persistence

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Multi-provider support and config normalization

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Team sharing and manifest versioning

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Competitive LandscapeFREE

Product	Does	Missing
act (nektos)	Runs GitHub Actions workflows locally via Docker. The most widely used option with 55k+ GitHub stars.	Poor fidelity on complex workflows: missing runner contexts, service containers often break, secrets injection is manual, and environment variables from the cloud runner are not replicated. Actively under-maintained. Developers report it silently passes locally while CI fails in cloud.
Dagger	Pipelines-as-code runtime (Go/Python/TypeScript) that runs identically locally and in CI by containerizing every step. Founded by Docker creators. Raised $20M Series A from Redpoint in 2022.	Requires rewriting pipelines from scratch in Dagger's SDK. Does not replay existing GitHub Actions or GitLab CI YAML failures. Teams must migrate their entire pipeline, which is a high-adoption-cost blocker for the debugging use case.
Tilt	Dev environment orchestration tool targeting Kubernetes-based workflows. Live updates for K8s services during development.	Kubernetes-specific and focused on inner-loop dev, not CI failure reproduction. No concept of replaying a CI step graph or providing environment parity against GitHub Actions/GitLab CI runners.
Agent CI	Runs GitHub Actions locally and pauses on failure so an AI agent can fix and retry without pushing. Bind-mounts local caches for near-instant startup.	Very early stage, limited workflow coverage, no enterprise secret/env management, no support for GitLab CI or other providers. Positioned as an AI-agent layer rather than a fidelity-first debugging tool.

Notable VoicesFREE

@SyntaxErrorist300 likes · 2026-05-07

"I still push commits just to see if CI passes. Every debug cycle is 10-15 minutes of waiting for a runner. There is no good local replay tool that actually matches the cloud environment."