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Overplane
Pricing
- Model
- Free
Summary
One agent deleted a production database during a code freeze. Another overwrote user files while reorganizing them — and neither left a record of exactly what it ran or why.
Overplane is a free, open-source CLI binary that wraps Claude Code, Codex, or OpenCode in container isolation, spec-driven builds, and Z3 formal verification before a single line of code is written. Every agent run executes in a locked-down container with a restricted view of the host system, so a bad outcome means deleting a sandbox, not restoring a backup. Builds are content-hashed and content-addressable, which means you can replay any build down to a single spec and see the normalized dollar cost attached to that run. The ceiling appears early in teams who need the tool to also do its own code generation — Overplane is a build wrapper around agents you already own, not a coding agent itself.
Bottom line: Pick this when auditability and container isolation are non-negotiable for your AI coding pipeline; plan around it when your team does not already have Claude Code, Codex, or OpenCode configured and does not want to manage multiple API keys.
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Pros
Sign in to edit- Every agent run executes in a locked-down container with a restricted view of the host system, so a compromised or misbehaving agent destroys a sandbox rather than your local environment or production credentials.
- Z3 runs on per-spec and merged Intermediate Representation models before any code is generated, which means logical contradictions in your spec surface as a pre-build error rather than a 4,000-line diff you have to reverse-engineer.
- Content-hashed images and content-addressable outputs make builds cacheable and replayable down to a single spec, so audit requests or incident investigations do not require reconstructing what the agent did from memory.
- Agent-agnostic design with per-project or per-run agent selection and normalized cost tracking across runs, which means you can benchmark Claude Code against Codex on the same spec without re-architecting anything.
- Apache-2.0 licensed with no hosted offering and no subscription, which means the tool introduces no vendor lock-in and no data leaving your infrastructure beyond what the agent API calls require.
Cons
Sign in to edit- Overplane does not include a coding agent — it drives Claude Code, Codex, or OpenCode, which means a team that does not already have those agents installed and API keys configured faces a multi-tool setup before a single build runs. Teams without an existing agent subscription hit this wall immediately and often reach for an integrated hosted tool instead.
- The tool is described as v0.0.8, which the vendor page does not present as production-stable. Teams evaluating it for a compliance-sensitive production pipeline face the specific problem of building internal policy around a binary that carries no stated stability guarantee — they document the version, pin it, and own the upgrade path.
- Formal spec verification with Z3 adds value only when specs are written to the schema Overplane expects. Teams migrating existing informal or prose-heavy spec documents spend the migration time rewriting specs before they see any verification benefit — the workflow does not adapt to how specs were written before.
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About
- Platforms
- Linux, macOS, Windows (local binary)
- API Available
- No
- Self-Hosted
- Yes
- Last Updated
- 2026-07-14T16:41:24.630Z
Best For
Who it's for
- Teams needing auditable and replayable AI code generation
- Projects requiring formal spec verification
- Developers who want container isolation for every agent run
- Users of Claude Code, Codex, or OpenCode seeking a build wrapper
What it does well
- Generate verified code from numbered Markdown specs
- Run coding agents safely in isolated containers
- Replay and audit exact build histories down to individual specs
- Validate specs for contradictions with Z3 before codegen
- Drive multiple agents per project with normalized cost tracking
Integrations
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Frequently Asked Questions
- Is Overplane free?
- Yes — Overplane is fully free to use. There is no paid tier.
- Is Overplane open source?
- Yes. Overplane is open source.
- Can I self-host Overplane?
- Yes. Overplane supports self-hosting on your own infrastructure.
- What platforms does Overplane support?
- Overplane is available on: Linux, macOS, Windows (local binary).
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Curated lists that include this category
Overplane is a single-file, Apache-2.0-licensed binary that turns AI coding agents into a build system. The workflow starts with numbered Markdown specs as the source of truth: schema-validated, git-diffable, and the only input the build consumes. From there, the tool lifts each spec into an Intermediate Representation, runs Z3 to check for contradictions across per-spec and merged models before any code is written, then passes the checked IR alongside the original spec to the agent. The agent runs inside a container image you build and control; if the run succeeds, Overplane reconciles the output. The vendor’s rustdis example — a wire-compatible Redis clone — shows the checked IR producing 48 passing property tests and Kani proof harnesses.
The differentiating feature is what the vendor calls a real build system for codegen: content-hashed sandbox images and content-addressable outputs make every build cacheable, incremental, and replayable down to an individual spec. Most spec-driven tools are Markdown prompts riding inside an agent with no record of which run produced what. Overplane treats that as the same problem compilation solved decades ago — the compiler just happens to be an agent.
Overplane fits teams who have already chosen an agent — Claude Code, OpenAI Codex, or OpenCode — and want container isolation, formal spec verification, and a reproducible audit trail layered on top. It does not replace the agents; it drives them headlessly on your own API keys, letting you swap agents per project or per run. The gap appears when a team needs an out-of-the-box coding agent with no prior key management or agent setup — Overplane offers neither. Teams that hit that wall look at the agents directly or at hosted wrappers that bundle the agent subscription alongside the build tooling.
The tool is distributed as a standalone binary described on the vendor page as v0.0.8. There is no API surface, no hosted offering, and no paid tier referenced. Multi-agent support allows different agents per project or per run, with normalized cost tracking across all of them so you can compare what each agent spent on the same spec set.