Bex Security

Open security workflows for every coding agent and model.

Bex Security is an upstream-first fork of OpenAI Codex Security. It keeps the proven workflow for finding, validating, and fixing vulnerabilities while working toward an open agent layer based on the Agent Client Protocol (ACP).

Our north star is simple: run a consistent, evidence-driven security workflow with the agent and model that fit your repository, without falling behind upstream security improvements.

⭐ If you want security tooling that is portable across agents, editors, and models, star this repository and watch the roadmap.

Supported Agents

Run the same evidence-driven security workflow with your preferred coding agent. Codex is the default; Claude Code, Kimi Code, Muse Code, Qwen Code, and MiMo Code support is currently alpha.

Codex   Claude Code   Kimi Code   Muse Code   Qwen Code   MiMo Code

Quick start

Requires Node.js 22.13.0 or later in the 22.x release line, Node.js 24.x or Node.js 26.x, and Python 3.10 or later.

npm install --global @bex-co/bex-security
bex-security scan /path/to/repository --agent claude

Or run directly without a global installation:

npx @bex-co/bex-security scan /path/to/repository --agent claude

The published npm package already contains the generated security plugin; the additional build steps below apply only to a source checkout.

To work from source, clone the repository, install both dependency trees, and build the bundled plugin and CLI:

git clone https://github.com/bex-co/bex-security.git
cd bex-security
pnpm --dir sdk/typescript install --frozen-lockfile
npm ci --prefix plugins/codex-security/mcp-app --no-audit --no-fund
pnpm --dir sdk/typescript run build:plugin
pnpm --dir sdk/typescript run build
./bex-security scan /path/to/repository --agent claude

Run ./bex-security from the checkout, or add the checkout to PATH for the current shell if you prefer the bare command:

export PATH="$PWD:$PATH"
bex-security --help

Why Bex Security

• Upstream-first, not a rewrite. Bex uses a repeatable upstream main merge workflow and treats Codex Security compatibility as a product requirement.
• Agent-open by design. ACP standardizes communication between code editors and coding agents. Bex uses that boundary to support a growing ecosystem without building a bespoke integration for every client.
• Model choice today. The inherited CLI already supports OpenAI, OpenRouter, Fireworks, and Amazon Bedrock provider paths.
• Security outcomes over raw output. The workflow carries findings from discovery through validation, remediation, comparison, and publication.

Project status

Bex Security is an early-stage fork published as @bex-co/bex-security. It preserves the upstream CLI behavior and codex-security command alias while making bex-security the primary command. Its first ACP vertical slice runs Codex sessions through codex-acp, and its pluggable agent integrations run Claude Code through claude-agent-acp; Kimi Code, Qwen Code, and MiMo Code through their native ACP servers; and Muse Code through Bex's community muse-code-acp adapter.

Capability	Status
Codex Security-compatible CLI and TypeScript SDK	Available
Multiple inference-provider paths	Available
Repeatable upstream merge workflow	Available
Codex sessions over ACP v1 and codex-acp	Alpha
Claude Code sessions over claude-agent-acp	Alpha
Kimi Code sessions over native kimi acp	Alpha
Muse Code sessions over muse-code-acp	Alpha
Qwen Code sessions over native qwen --acp	Alpha
MiMo Code sessions over native mimo acp	Alpha
Kimi models through Claude Code	Alpha
Additional ACP agents	Contributors welcome
Bex-branded CLI (bex-security)	Available
Bex-branded npm package	Available

Target architecture

ACP is an agent-runtime boundary, not a replacement for Bex's security orchestration or a universal model API. Bex must continue to own scan scope, workflow selection, permissions, artifact validation, persistence, and final sealing regardless of which agent executes the work.

flowchart TB
    operator@{ shape: tri, label: "developer / security engineer" }
    repo["target repository (local files, inert data)"]
    artifacts[("scan artifacts (local files)")]
    model["model endpoint (external or local service)"]

    subgraph host["Bex host — one local CLI or SDK process"]
        entry["CLI / TypeScript SDK (in-process entrypoint)"]
        orchestrator["scan orchestrator + contract host (in-process)"]
        workflow["security workflows + schemas (inert, portable source of truth)"]
        runtime["agent runtime port (in-process interface)"]
        workbench["scan workbench (local Python subprocess + MCP server)"]
        history[("scan history (local SQLite)")]
        gateway["scoped execution gateway (in-process policy + MCP config)"]
        acpAdapter["ACP v1 client adapter + agent drivers (current, in-process)"]
    end

    subgraph agents["Agent processes launched per turn"]
        codexAcp["codex-acp agent (current subprocess)"]
        codex["Codex app-server + security plugin (current subprocess)"]
        claudeAcp["claude-agent-acp + Claude Code (current subprocess)"]
        kimiAcp["Kimi Code native ACP (current subprocess)"]
        museAcp["muse-code-acp + Muse Code (current subprocess)"]
        qwenAcp["Qwen Code native ACP (current subprocess)"]
        mimoAcp["MiMo Code native ACP (current subprocess)"]
        acp["additional compatible ACP agent (future subprocess)"]
    end

    operator --> entry
    entry --> orchestrator
    orchestrator --> repo
    orchestrator --> workflow
    orchestrator --> runtime
    orchestrator --> workbench
    workbench --> history
    workbench --> artifacts
    runtime --> acpAdapter
    acpAdapter <-->|bidirectional ACP v1 over stdio| codexAcp
    acpAdapter <-->|same ACP v1 transport| claudeAcp
    acpAdapter <-->|same ACP v1 transport| kimiAcp
    acpAdapter <-->|same ACP v1 transport| museAcp
    acpAdapter <-->|same ACP v1 transport| qwenAcp
    acpAdapter <-->|same ACP v1 transport| mimoAcp
    codexAcp <-->|Codex app-server JSON-RPC| codex
    acpAdapter -.->|future capability-tested driver| acp
    acpAdapter --> gateway
    gateway -->|read-only source access| repo
    gateway -->|draft writes| artifacts
    gateway -->|stdio MCP tools| workbench
    claudeAcp -->|Claude-owned model configuration| model
    kimiAcp -->|Kimi-owned model configuration| model
    museAcp -->|Muse-owned model configuration| model
    qwenAcp -->|Qwen-owned model configuration| model
    mimoAcp -->|MiMo-owned model configuration| model
    codex -->|provider-specific API| model
    acp -->|agent-owned model configuration| model

The adapter makes Bex the ACP client and selects a small agent driver for codex-acp, claude-agent-acp, native kimi acp, muse-code-acp, native qwen --acp, or native mimo acp. Bex launches the selected agent per turn, negotiates ACP v1, creates or resumes its session, streams protocol updates into the existing scan observers, forwards cancellation, and preserves the current noninteractive permission boundary. The agent still owns model authentication and access; Bex continues to own scan scope, the workflow, workbench tools, and artifact validation. This keeps the integration small enough to track upstream while proving that orchestration is independent of one agent transport.

The adapter boundary is capability-based rather than Codex-shaped. A new agent must prove that it can run the same scoped workflow and produce artifacts that pass Bex's existing validation and sealing contract. ACP does not make agents or model APIs interchangeable by itself.

To make the workflow portable, Bex must extract the security instructions and schemas from Codex-specific plugin loading into a runtime-neutral workflow pack. Agent-produced files remain drafts until the Bex workbench validates and seals them. codex-acp is a useful first compatibility target and reference implementation, not a required layer for every agent.

Roadmap

1. Stay current: continuously merge upstream changes and keep the existing CLI, SDK, security controls, and scan artifacts compatible.
2. Extract the stable host contract: separate portable prompts, schemas, workbench tools, artifact rules, and progress events from Codex plugin installation details.
3. Harden the ACP v1 vertical slice: expand the Codex and Claude drivers from protocol and compatibility tests to repeatable full-scan fixtures, structured-output conformance, and interruption tests.
4. Open the agent port: add registry agents only when they pass the same capability, artifact-contract, and scan-integrity suite.
5. Expand by evidence: publish a capability-based compatibility matrix for agents and the models they expose. Keep draft ACP v2 support experimental until the protocol stabilizes.
6. Release independently: publish Bex builds as upstreamVersion-bex.N, with package metadata recording the exact upstream baseline.

Want to help? High-leverage contributions include ACP protocol mapping, official-schema contract fixtures, agent/model compatibility reports, upstream regression automation, and concise onboarding examples. Tell us which ACP agent you want Bex to support first.

Upstream compatibility

Bex publishes the TypeScript SDK and CLI as @bex-co/bex-security. The bex-security command is primary, while codex-security remains a compatible alias for existing scripts. Bex releases use upstreamVersion-bex.N and record their upstream package version and commit in npm metadata. See the upstream Codex Security documentation for the complete CLI reference and upstream releases for the canonical changelog and upgrade notes.

The wrapper forwards every argument to the Bex CLI. The TypeScript package also exposes bex-security as a bin alias while retaining codex-security for upstream compatibility.

Some cybersecurity requests and protected findings require approval through Trusted Access for Cyber. To join the program, visit chatgpt.com/cyber.

Choose an agent

To scan with Claude Code, authenticate Claude locally and select the Claude ACP agent:

./bex-security scan /path/to/repository --agent claude

Bex keeps no model allowlist for --agent claude: it forwards --model and --effort to Claude Code over ACP and validates them against the models and reasoning levels your local installation advertises. Claude Code exposes its models as tier aliases rather than versioned ids — a current install offers default, opus[1m], fable, sonnet, and haiku. Select one by alias; for example, fable resolves to your Claude Code's current Fable build (Fable 5.1):

./bex-security scan /path/to/repository --agent claude --model fable --effort high

To pin a specific version behind an alias, export the matching Claude Code variable (for example ANTHROPIC_DEFAULT_FABLE_MODEL) before scanning; the native --agent claude path forwards it to Claude Code unchanged. If Bex reports that a value is not offered, the local Claude Code does not advertise it yet — upgrade Claude Code rather than Bex.

To run Claude Code with GLM through Z.AI, provide a Z.AI API key and select the Z.AI provider:

export ZAI_API_KEY="<your-zai-api-key>"
./bex-security scan /path/to/repository --agent claude --provider zai

This defaults to glm-5.3[1m]. Select another GLM model explicitly when needed:

./bex-security scan . --agent claude --provider zai --model glm-5.3

Bex configures Z.AI only for the Claude ACP subprocess. It does not rewrite your Claude Code settings or store the API key. See the Z.AI Claude Code guide for account and model availability details.

Kimi is available either as a model provider behind Claude Code or as a native ACP agent. The Claude provider path uses a Kimi API key and defaults to kimi-for-coding:

export KIMI_API_KEY="<your-kimi-api-key>"
./bex-security scan . --agent claude --provider kimi
./bex-security scan . --agent claude --provider kimi --model k3-256k

For the native path, install Kimi Code, make sure kimi is on PATH, and log in once before scanning:

kimi login
./bex-security scan . --agent kimi
./bex-security scan . --agent kimi --model kimi-code/k3-256k --effort high

The native agent uses Kimi Code's saved authentication and provider settings. Bex starts kimi acp, forwards its security workbench over ACP, and reports the model and thinking level negotiated by Kimi. See the Kimi Code installation guide, Kimi ACP reference, and Kimi Claude Code guide.

Muse Code is available through the Bex-maintained @bex-co/muse-code-acp adapter. The adapter ships with Bex Security; install Muse Code and authenticate it once:

muse login

Then select Muse for a scan:

./bex-security scan . --agent muse
./bex-security scan . --agent muse --model muse-spark-1.2-contributor --effort high

Bex forwards its stdio security workbench through ACP. Muse owns model authentication and configuration. Muse does not expose additional ACP workspace roots or interactive tool approvals, and usage or cost may be unavailable when a scan completes. Because Muse does not expose delegated workers through ACP, Bex automatically runs bounded host-managed review assignments and advances file coverage only for completed, non-truncated read operations. The existing scan command needs no Muse-specific orchestration flag.

Qwen Code runs through its native ACP server. Install it, launch qwen, and use /auth once to configure a provider before scanning:

npm install --global @qwen-code/qwen-code@latest
qwen
./bex-security scan . --agent qwen
./bex-security scan . --agent qwen --model qwen3-coder-plus --effort high

Bex starts qwen --acp and negotiates the models and reasoning levels advertised by Qwen Code. See the Qwen Code quickstart.

MiMo Code also runs through its native ACP server. Install it and complete its first-run provider setup before scanning:

npm install --global @mimo-ai/cli
mimo
./bex-security scan . --agent mimo
./bex-security scan . --agent mimo --model xiaomi/mimo-v2.5-pro --effort high

Bex starts mimo acp and preserves MiMo's current primary agent mode. MiMo exposes thinking levels as model variants, so --effort high selects the advertised .../high variant of the selected or current model. Bex reports an error with the available variants when the requested level is unavailable. See the MiMo Code repository.

Codex remains the default agent. Sign in with ChatGPT or provide an API key:

./bex-security login
./bex-security scan /path/to/repository

Common scan commands:

./bex-security scan . --patch
./bex-security scan . --patch --patch-severity high --json
./bex-security scan . --patch --patch-severity high --create-pr
./bex-security scan . --model gpt-5.6-terra --effort high
./bex-security scan . --agent claude
./bex-security scan . --agent claude --provider zai --model glm-5.3
./bex-security scan . --agent claude --provider kimi
./bex-security scan . --agent kimi
./bex-security scan . --agent muse
./bex-security scan . --agent qwen
./bex-security scan . --agent mimo
./bex-security scan . --scan-prompt-file scan.md --post-scan-prompt-file follow-up.md
./bex-security scan . --validation-prompt-file validation.md
./bex-security scan . --mode deep --workers 2 --subagents 0 --stop-after-no-new 3 --max-discovery-runs 10 --max-time-hours 1.5

For CI with Codex, set OPENAI_API_KEY or CODEX_API_KEY instead of signing in. --agent claude delegates authentication and model discovery to the local Claude Code installation unless a provider is selected. --agent kimi delegates both to the local Kimi Code installation, --agent muse delegates both to Muse Code through muse-code-acp, and --agent qwen and --agent mimo delegate both to their respective local installations. The default remains --agent codex; saved scan recipes created before agent selection also replay with Codex.

Use --validation-prompt-file to replace final validation with your own setup, testing, and cleanup instructions. This works for standard and diff scans; Deep scans do not support it. See custom validation. For a runnable local example, see the custom validation demo. Environment API keys are passed directly to the current scan and are never stored in Codex's credential home or system keyring.

After showing the findings summary, interactive scans with findings ask whether to open a finding browser where you can inspect full details, choose a severity threshold, select individual findings, and add patch instructions for each one. Each selected finding runs in its own saved Codex desktop task. Use --patch --patch-severity high to fix high and critical findings. Add --create-pr, or enable the pull request option during review, to commit the verified files and open a draft GitHub pull request. Ordinary scans do not change repository files.

Deep-scan discovery stops after 96 hours by default. Set --max-time-hours to any positive number of hours, including fractional hours, up to 96. Completed findings are preserved and returned when the limit is reached.

For a monorepo, run separate standard scans and combine their results by root cause:

./bex-security scan-components . \
  --component apps/api --component apps/web \
  --output-dir /path/outside/repository/results

Use --auto to let Codex choose the components, or --auto --plan-only to review the split first. See component scans for reusable plans, combined reports, and coverage details.

To use another inference provider, set its API key and select a model:

export OPENROUTER_API_KEY="<your-openrouter-api-key>"
./bex-security scan . --agent codex --provider openrouter --model anthropic/claude-sonnet-4.5

export FIREWORKS_API_KEY="<your-fireworks-api-key>"
./bex-security scan . --agent codex --provider fireworks --model accounts/fireworks/models/qwen3-235b-a22b

export AWS_BEARER_TOKEN_BEDROCK="<your-bedrock-api-key>"
export AWS_REGION="us-east-2"
./bex-security scan . --agent codex --provider amazon-bedrock --model openai.gpt-5.6-luna

Amazon Bedrock also supports standard AWS access keys, profiles, web identity, container credentials, and the default AWS credential chain.

Local sign-in honors Codex's configured credential backend, including a system keyring required by a managed device. Bex Security keeps login and scan credentials in the same private, persistent state directory.

If both a ChatGPT sign-in and an API key are available, interactive scans ask which credential to use. CI and other noninteractive scans keep the existing API-key precedence. Select a credential explicitly when needed:

./bex-security scan . --auth chatgpt
./bex-security scan . --auth api-key

To make your ChatGPT sign-in the automatic default, unset any configured API keys:

unset OPENAI_API_KEY CODEX_API_KEY

Scan history is stored in the Bex Security workbench state directory. If that directory cannot be written, set CODEX_SECURITY_STATE_DIR to a writable directory outside the repository.

Applications can attribute API-key scans to an end user with scan --safety-identifier ID or the SDK's per-run safetyIdentifier option. See Safety ID setup and runtime requirements.

findings list [repository] shows open findings across a repository's scans and identifies findings not confirmed in its latest scan.

Use patch OCCURRENCE_ID to fix one saved finding, or patch --scan SCAN_ID --severity high to fix selected findings from a saved scan. Add --json for structured results or --create-pr to open a draft GitHub pull request after verification. If publication fails, use the printed patch --resume-pr BRANCH command to retry without running Codex again.

Use patch --linear-issue SEC-123 to import and fix a Linear issue, or patch --linear-project "Security backlog" --linear-filter '{"labels":{"name":{"eq":"security"}}}' to fix matching open issues from a project. Set CODEX_SECURITY_LINEAR_API_KEY to authorize read-only Linear access.

scans compare BEFORE_SCAN_ID AFTER_SCAN_ID automatically matches findings by root cause, reuses saved matches, and identifies new, persisting, reopened, resolved, or unknown findings. Missing findings remain unknown when coverage is incomplete or their original location was not reviewed.

Publish scan findings

Publish every finding from a completed scan to a Linear team:

./bex-security publish scan /