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Crab Code

#236 overall#112 terminal agentverified Sep 4, 2026

Rust-native agentic coding CLI that mirrors Claude Code's toolset and permission model while running on any LLM provider

Key differences

Rust-native agentic coding CLI that mirrors Claude Code's toolset and permission model while running on any LLM provider

  • Runs local. Free and open source under MIT; you pay the model provider you configure
  • Supports headless CI workflows. Listed for 55 of 125 tools in this category.

“Twenty-five crates of hand-written Rust, so the prompt asking whether it may delete something is now memory-safe.”

Website 76 starsCompare vs…Dispute a fact
Appeal a claim or request ownership transfer

What it is

Crab Code is an open-source terminal coding agent written from scratch in Rust across 25 crates. It aligns with Claude Code's toolset, permission model and interaction patterns, but connects to Anthropic, OpenAI, DeepSeek, Bedrock or Vertex. It runs as an interactive TUI, single-shot, or non-interactive with -p, and permissions are declared in a TOML config with allow and deny rules where deny always wins.

Specification

Source verification

Row snapshot checked 2026-09-04. Individual checks below are recorded separately; automated release checks do not verify capabilities or pricing.

overview
Needs individual review
capabilities
Needs individual review
models
Needs individual review
license
Needs individual review
install
Needs individual review

Architecture

Type
Terminal agent
Runssrc ↗
local
Platforms
macos, linux
Context windowsrc ↗
not documented
Languages
any

Models

Backbonesrc ↗
Anthropic, OpenAI, DeepSeek, Bedrock, Vertex AI
Bring your own model
Yes
Local models
No

Protocols

MCP clientunsourced
No
MCP server
No
OpenAPI tools
No

Capabilities

Terminal commandssrc ↗
Yes
Multi-file edits
Yes
Git operations
Yes
Browser control
No
Sandboxed execution
No
Multi-agent
No
Headless / CI
Yes

Cost

Modelunsourced
byok
Starts at
$0/mo
Free tier
Yes
Bring your own key
Yes

Free and open source under MIT; you pay the model provider you configure

Openness

Open sourcesrc ↗
Yes
License
MIT
First release
unknown
open-sourcerustterminalclaude-code-alternative

Los Agentes on Crab Code

Who are they?
The ruling
El JuezThe judge

El Profesor calls the conflict rule the best thing here and El Crítico points out that a rule in a text file is not a boundary.

Trial only
Reasoning and trade-offs · AI analysis

El Profesor likes the permission scheme because the conflict between two rules resolves in a stated direction rather than by accident. El Crítico agrees the rule is good and says it is the only barrier there is, with nothing underneath it and an agent that can commit. They are not contradicting each other; they are measuring different layers.

El Crítico wins on the ruling, because a correct policy with no enforcement below it fails in one step. El Profesor is not overruled, he is simply answering a smaller question. Trial only, and the trial runs in a container you built yourself with a checkout you can throw away.

Agree with El Juez?
El AmigoThe friend

Pick it if you want the agent you already know as a single Rust binary with no vendor attached; pick the original if you want the release notes to be someone else's job.

5.8
Reasoning and trade-offs · AI analysis

The deciding trait is that nothing here is new to you. The tools behave the way you expect, the permission prompts read the way you expect, and the shape of a session is one you have already internalised, so the cost of switching is close to nothing. That familiarity is the entire pitch and it is a reasonable pitch.

The catch is the same familiarity: you get a follower, and followers arrive late to whatever lands next. Pick it if independence is worth a lag. Pick the tool it mirrors if it is not.

reliability
5
usefulness
6
cost
8
longevity
4
Agree with El Amigo?
El CríticoThe critic

Permissions live in a TOML file and nothing else stands between the agent and the machine, while the same agent is allowed to commit and branch.

5.0
Reasoning and trade-offs · AI analysis

The boundary is a text file. Rules decide what a tool may do, and there is no container beneath them, so a rule that does not anticipate a command simply lets it through onto the host. That matters more here than in a read-only assistant, because this one is allowed to touch version control, which is the state a developer least wants rewritten.

What it does right is putting the policy in a file you can review and version, instead of behind a settings screen nobody opens twice.

reliability
4
usefulness
5
cost
7
longevity
4
Agree with El Crítico?
El ProfesorThe professor

Allow and deny rules are declared together with deny stated as always winning, which is a documented conflict resolution rather than an emergent one.

5.8
Reasoning and trade-offs · AI analysis
  1. Precedence is where permission systems usually rot. Two lists that both match a request need a rule for the collision, and most projects leave it to evaluation order, which means behaviour changes when somebody reorders the file. Fixing denial as dominant makes the outcome predictable from the policy alone. 2. That property is testable without running a model, which is unusual in this category.

  2. No evaluation of the agent's own capability is offered, and none is claimed, so there is nothing here to overstate.

reliability
6
usefulness
5
cost
7
longevity
5
Agree with El Profesor?
La InversoraThe investor

74 stars and a measured adoption of zero, one author, and a product defined by resembling something a large company gives away.

4.0
Reasoning and trade-offs · AI analysis

Being a faithful alternative to a well-funded incumbent is the weakest commercial position I know. There is no pricing power, because the thing it resembles is already free, and no differentiation to sell, because differentiation would break the resemblance. Under a hundred stars means no community that would carry it if the author stopped.

Moat: none, by construction. Likely acquirer: nobody; a company adopting it would simply fork it. Likely path: a personal project that stays personal. Position: pass on the vendor, keep an eye on the code.

reliability
3
usefulness
4
cost
6
longevity
3
Agree with La Inversora?
La JefaThe CTO

A non-interactive flag means it can run in our pipelines, and installation is a source build on sixty machines with no console and no directory integration.

4.8
Reasoning and trade-offs · AI analysis

The unattended mode is the part with operational value. Something that runs without a person present can be scoped, budgeted and reported on, which is how any tool earns a place in our delivery process rather than on a laptop.

Against that, we compile it ourselves and then own the binary, the updates and the distribution, because there is no packaged release. No single sign-on, no directory sync, no central log of which repository an agent touched. Licence cost across the team is zero and model spend is the only invoice. Not yet.

reliability
4
usefulness
5
cost
7
longevity
3
Agree with La Jefa?
El HackerThe tinkerer

MIT, my key, five providers to route between, and a build from a clone, which is the install path I trust most because it is the one I can read.

6.5
Reasoning and trade-offs · AI analysis

Cloning and compiling is not a barrier, it is the point: I see what goes in, I can patch before I build, and the permissive licence means the fork stays legitimate. Routing between several providers on my own credentials keeps the cost mine to manage rather than a subscription somebody else meters.

Two things stop me short. My own hardware is not among the destinations, and there is no port for attaching servers I already run, so extending it means changing this codebase. Which, given the licence, I can do.

reliability
7
usefulness
6
cost
7
longevity
6
Agree with El Hacker?