Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/claudius-ars/bulwark/codexgit clone --depth 1 https://github.com/claudius-ars/bulwarkWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00000 | $0.04890 |
| Opus 5 | $0.00000 | $0.02445 |
| Sonnet 5 | $0.00000 | $0.00978 |
| Haiku 4.5 | $0.00000 | $0.00489 |
Grade A, and why
codex scanned grade A with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Asks for rootlowPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
# macOS: sudo security add-trusted-cert -d -r trustRoot -k /Library/Keychains/System.keychain ~/.bulwark/ca/bulwark-ca.crt Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
3. Test proxy directly: `curl -x http://localhost:8080 https://api.github.com` How it starts
The opening of the file, as written. The whole thing — 763 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Codex Integration
Codex is an AI agent for software development that operates through HTTP APIs. Bulwark integrates with Codex via the HTTP forward proxy to add governance, policy enforcement, and audit logging.
Overview
Bulwark provides Codex with:
- Policy enforcement: Control which APIs Codex can access
- Credential management: Securely inject API keys and tokens
- Audit logging: Track all HTTP requests and decisions
- Content inspection: Scan for secrets, PII, and security issues
- Rate limiting: Control request rates and costs
- TLS MITM: Inspect HTTPS traffic for governance
Architecture
Codex Agent
|
| (HTTP/HTTPS proxy)
|
Bulwark HTTP Proxy
|
| (Policy, Credentials, Audit, Content Inspection)
|
External APIs (GitHub, Slack, AWS, etc.)
Codex is configured to route all HTTP traffic through Bulwark's forward proxy, which enforces policies and injects credentials before forwarding to external APIs.
Configuration
1. Configure Bulwark HTTP Proxy
Create or edit ~/.bulwark/bulwark.yaml:
http:
enabled: true
listen_addr: "127.0.0.1:8080"
# TLS MITM for HTTPS inspection
tls:
enabled: true
ca_cert: ~/.bulwark/ca/bulwark-ca.crt
ca_key: ~/.bulwark/ca/bulwark-ca.key
# URL-to-tool mappings for policy enforcement
tool_mappings:
- url_pattern: "https://api.github.com/*"
tool_name: "github::api"
- url_pattern: "https://api.github.com/repos/*/issues"
tool_name: "github::create-issue"
methods: ["POST"]
- url_pattern: "https://api.github.com/repos/*/issues/*"
tool_name: "github::update-issue"
methods: ["PATCH"]
- url_pattern: "https://api.github.com/repos/*"
tool_name: "github::delete-repo"
methods: ["DELETE"]
- url_pattern: "https://slack.com/api/chat.postMessage"
tool_name: "slack::post-message"
methods: ["POST"]
- url_pattern: "https://*.amazonaws.com/*"
tool_name: "aws::api"
# Enable policy enforcement
policy:
enabled: true
policy_file: ~/.bulwark/policies.yaml
# Enable credential vault
vault:
enabled: true
vault_dir: ~/.bulwark/vault
# Enable audit logging
audit:
enabled: true
database_path: ~/.bulwark/audit/audit.db
# Enable content inspection
content_inspection:
enabled: true
scan_requests: true
scan_responses: true
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 763 lines · 0 tokens per session scan A f56debf0f9c3
codex is an agent published in the GitHub repository claudius-ars/bulwark (4 stars, last pushed 6mo ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 4,890 tokens. A static security scan graded it A with 2 findings (asks for root, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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