Cruxible vs firstmate

Cruxible and firstmate are both agent frameworks tracked by AIDiveForge. Below is a side-by-side comparison of pricing, capabilities, platforms, and ownership — sourced from each tool's live website and verified before publishing.

Cruxible

Cruxible treats agent-written state as something that must be proposed, reviewed, and evidence-linked before it counts — not just logged after the fact. Every claim carries a receipt, every query can be reproduced, and every write goes through a structured proposal workflow rather than landing directly. The model fits audit-heavy domains where 'the agent said so' is not an acceptable answer. The ceiling appears when you need the tool to decide what to do next: Cruxible is a state layer and workflow runtime, not a planner, so you bring the decision logic yourself. Teams with existing data exports can convert them into structured state, but anything requiring dynamic planning or autonomous tool use sits outside this tool's scope.

firstmate

firstmate puts a single orchestrating agent — the 'first mate' — in front of you, while it spawns a crew of autonomous coding agents behind the scenes, each isolated in its own git worktree. You describe what needs doing; the crew splits the work in parallel and keeps collisions out of your main branch. The visible session backend means you can watch what each agent is doing without switching tabs. The architecture works cleanly for investigation tasks, parallel fixes, or supervised PR generation — the constraint is that there is no API surface, so anything requiring programmatic integration into an existing CI pipeline has to wire around the tool manually.

Attribute	Cruxible	firstmate
Pricing	Free	Free
Free trial	No	No
Open source	Yes	Yes
Has API	No	No
Self-hosted option	Yes	Yes
Platforms	Python	—
Pros	Evidence-linked state claims, so every agent output can be traced back to its source rather than accepted on faith — which means audit requests become a query, not a forensic investigation. Proposal-and-review write governance, so no agent output modifies shared state without a structured approval step — which means you stay in the loop on consequential writes without wiring that control yourself. Reproducible query receipts, so a query over accumulated state can be re-run and verified — which means 'what did the agent know when it said that' has a deterministic answer rather than a shrug. Self-hostable under Apache-2.0, so the state layer and all evidence it holds stays inside your infrastructure — which means no vendor dependency on the component that carries your compliance-sensitive data. Existing knowledge base import via the wiki-import path the repository describes, so converting prior data exports into governed structured state does not require rebuilding from scratch.	Crew-based parallel dispatch, so three investigation or fix tasks run simultaneously instead of sequentially — cutting the wall-clock time you'd spend babysitting separate agent sessions. Per-agent git worktree isolation, which means parallel agents working on adjacent code do not produce mid-run merge conflicts that you have to untangle before any output is usable. Visible session backend for the whole crew, so you can monitor what each agent is doing without switching terminals or losing track of which session held the failing test. Self-hosted under MIT license with no paid features gated behind a tier, so teams with data-residency or audit requirements can deploy it without a vendor conversation. Supervised agent loops with PR or report output as the end state, which means you review finished work rather than raw agent traces — keeping you in the loop at the decision point that matters.
Cons	Cruxible contains no planner and no autonomous tool-use loop. Any agent behavior that requires deciding what step runs next — branching based on a prior result, retrying on failure, choosing between tools — must be implemented in the layer above it. Teams building anything beyond a linear deterministic workflow end up maintaining a separate planning runtime alongside Cruxible, which doubles the operational surface. The repository shows early community traction. With no prior related tools listed in the ecosystem and a small commit and star count at scrape time, there is no established community to pull patterns from when the docs run out. Teams that hit undocumented edge cases are filing issues against a project that has not yet accumulated that institutional knowledge — teams with a shorter runway on exploration abandon it for a more documented state management approach. The tool is Python-only based on the repository structure and pip installation model. Teams running agent infrastructure in Go, TypeScript, or other runtimes face a cross-language integration boundary at the state layer — a boundary that typically means either a sidecar process or abandoning the tool entirely for something that compiles into their existing stack.	No API surface exists in the architecture, so teams that need to trigger agent crews from a CI system or external scheduler have to build shell-level integrations against a tool not designed for that pattern — and maintain that glue code themselves. The crew model requires a human interacting with the first mate agent as the starting point; fully unattended, scheduled agent runs with no human in the dispatch loop are not a supported workflow, which is the condition under which teams move to an orchestration framework that exposes a programmatic entry point. Community support through GitHub issues is the primary support channel — with 29 open issues noted on the repo — so teams encountering edge-case failures in production have no escalation path beyond the open-source community.

Bottom line

Cruxible and firstmate are closely matched on pricing model, openness, and API availability — pick by feature set and platform support in the table above.

Frequently asked questions

What is the difference between Cruxible and firstmate?

Cruxible is Free and open source, while firstmate is Free and open source. Compare pricing, free trial, API, platforms, and pros/cons in the table above on AIDiveForge.

Is Cruxible better than firstmate?

It depends on your workflow. Use the side-by-side attributes (pricing, open source, API, self-hosted, platforms) to decide. AIDiveForge does not rank a universal winner — we publish verified facts so you can choose.