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 skills/sd0xdev/sd0x-harness/codex-code-reviewnpx skills add sd0xdev/sd0x-harness --skill codex-code-reviewgit clone --depth 1 https://github.com/sd0xdev/sd0x-harnessWhat 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 | $0.00053 | $0.06999 |
| Opus 5 | $0.00026 | $0.03499 |
| Sonnet 5 | $0.00011 | $0.01400 |
| Haiku 4.5 | $0.00005 | $0.00700 |
Grade A, and why
codex-code-review scanned grade A with 0 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 2d ago.
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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 389 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Codex Code Review
Trigger
- Keywords: review, PR, code review, second opinion, audit, check
When NOT to Use
- Document review (use
doc-review) - Security-specific review (use
security-review) - Test coverage review (use
test-review) - Just want to understand code (use
code-explore)
Variants
| Variant | Command | Scope | Pre-checks |
|---|---|---|---|
| Fast | /codex-review-fast |
Diff only | None |
| Full | /codex-review |
Diff + local checks | lint:fix + build |
| Branch | /codex-review-branch |
Full branch | None |
Shared Workflow
Collect changes → [Pre-checks if Full] → Codex Review → Gate: derive sentinel × gate_reason (Step 4.5)
→ Ready × NONE → next gate | Blocked × IN_SCOPE_BLOCKING × untriggered → fix loop | other Blocked outcomes → E1/E2
Dual dispatch adds a second reviewer, and is opt-in:
--dual: … → Codex + Task in parallel → Merge findings in conversation (field-level)
→ Gate: derive sentinel × gate_reason (Step 4.5)
→ Ready × NONE → next gate | Blocked × IN_SCOPE_BLOCKING × untriggered → fix loop | other Blocked outcomes → E1/E2
Step 0: Reviewer Mode
Default: Codex alone. Do not launch a secondary reviewer. One reviewer, one verdict, noted in Step 4.5 — there is no mode field, no aggregate plane and no state machine behind this choice: which reviewers ran is a fact of the conversation, not of a store (hook-lightweighting § 3.3).
--dual (Branch variant only): adds a second reviewer in parallel; on the Codex-healthy path the merge is yours to perform in conversation (Step 4). A second opinion for releases, security-sensitive changes and public API surfaces — nothing persists it, nothing blocks on it, and the next invocation starts single again unless the flag is passed again. When Codex is out, there is no merge: the validated fallback report carries the gate alone (Step 3.5 Codex-failure path).
What ships with it
9 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- references/codex-prompt-branch.md 8.7 KB
- references/codex-prompt-fast.md 8.8 KB
- references/codex-prompt-full.md 9.0 KB
- references/codex-research-instructions.md 3.5 KB
- references/loop-diagnostics.md 9.4 KB
- references/review-common.md 24 KB
- references/scope-contract.md 14 KB
- review_rubric.md 1.1 KB
- templates/review_output.md 361 B
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.
- 2d ago First seen · 389 lines · 53 tokens per session scan A 107834055db7
codex-code-review is a skill published in the GitHub repository sd0xdev/sd0x-harness (188 stars, last pushed 3d ago), licensed MIT. It adds 53 tokens to every session and 6,999 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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