Claude Code Skills Marketplace is a collection and marketplace of skills, plugins, agents, and instructions that extend Claude Code with specialized development workflows. It is for developers who want to install existing workflows or create, validate, and package their own Claude Code skills.
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 skills add daymade/claude-code-skills --skill read-codex-historygit clone --depth 1 https://github.com/daymade/claude-code-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/daymade/claude-code-skills/read-codex-history)<a href="https://agentmods.dev/skills/daymade/claude-code-skills/read-codex-history"><img src="https://agentmods.dev/badge/skills/daymade/claude-code-skills/read-codex-history/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/daymade/claude-code-skills/read-codex-history"><img src="https://agentmods.dev/badge/skills/daymade/claude-code-skills/read-codex-history.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What 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 5.1 | $0.00090 | $0.06438 |
| Opus 5.5 | $0.00036 | $0.02575 |
| Sonnet 5.5 | $0.00018 | $0.01288 |
| Haiku 4.5 | $0.00009 | $0.00644 |
Grade A, and why
read-codex-history 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 — 464 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Read Codex History
Read Codex evidence only. Do not continue the old task or change its project. If
the user wants execution after the read is complete, pass the verified evidence
to daymade-claude-code:continue-codex-work.
Find a complete thread ID first
For a pasted UUID prefix or an identity-only request, run this bounded lookup:
python3 <skill-dir>/scripts/find_codex_session.py <UUID-prefix>
Accept only exit 0 with status: unique and identity_verified: true. The command
queries matching state-index rows, includes archived/subagent entries, and verifies
the unique candidate with the exact rollout locator. It does not export unrelated
inventory, read conversation bodies, or probe writer locks. On ambiguity, show the
returned candidates and ask for a longer prefix; on unavailable evidence, retain
unknown. Return the verified ID and title, then stop. Load the rest of this Skill
only for an additional requested result. Read lookup and JSON contracts
only for exit handling, programmatic consumption or inventory JSON parsing.
Codex history surfaces
| Surface | Authority | Use |
|---|---|---|
<codex-home>/history.jsonl |
What the user submitted, keyed by Session ID and internal epoch timestamp | Exact recent user-input tables |
state_*.sqlite |
Inventory metadata such as cwd, title, update time, and rollout path | Fast listing and candidate discovery |
sessions/**/rollout-*.jsonl and archived_sessions/** |
Full user/assistant/tool/compaction/fork event stream | Exact-session evidence and keyword verification after indexed or physical preselection |
<codex-home>/logs_*.sqlite (pick the latest by mtime) |
Runtime events: per-event ts, level, target, feedback_log_body, process_uuid (embeds the OS pid), optional thread_id |
Which live process is failing and how — error-shape bucketing and time distribution |
Do not substitute one surface for another. A prompt-ledger row proves what was
submitted, not what the Agent answered. A state DB path is only a candidate until
the rollout's session_meta.id matches. A rollout can exist without a prompt-ledger
row, and a /fork prompt can exist without a child rollout. A runtime-log thread
is not a resumable session until state_*.sqlite confirms it (see below).
What ships with it
38 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.
- evals/evals.json 2.5 KB
- references/codex_rollout_format.md 24 KB
- references/legacy_multi_provider_inventory.md 14 KB
- references/session-lookup.md 2.9 KB
- references/storage_and_portability.md 17 KB
- references/terminal-session-recovery.md 3.9 KB
- references/user_input_reconciliation.md 12 KB
- scripts/_core/__init__.py 1.3 KB runs code
- scripts/_core/claude.py 5.6 KB runs code
- scripts/_core/codex.py 12 KB runs code
- scripts/_core/homes.py 4.0 KB runs code
- scripts/_core/kimi.py 15 KB runs code
- scripts/_core/model.py 2.0 KB runs code
- scripts/_core/native_output.py 2.1 KB runs code
- scripts/_core/parse.py 6.2 KB runs code
- scripts/_core/sources.py 13 KB runs code
- scripts/_core/text.py 35 KB runs code
- scripts/analyze_sessions.py 117 KB runs code
- scripts/find_codex_session.py 5.1 KB runs code
- scripts/list_codex_user_inputs.py 11 KB runs code
- scripts/list_local_history.py 35 KB runs code
- scripts/prompt_cursor.py 5.3 KB runs code
- scripts/read_codex_session.py 120 KB runs code
- scripts/reconcile_codex_inputs.py 21 KB runs code
- tests/test_analyze_sessions.py 59 KB runs code
- tests/test_find_codex_session.py 8.0 KB runs code
- tests/test_kimi_provider.py 18 KB runs code
- tests/test_list_codex_user_inputs.py 8.0 KB runs code
- tests/test_list_local_history.py 62 KB runs code
- tests/test_native_output.py 2.9 KB runs code
- tests/test_original_record_evidence.py 5.1 KB runs code
- tests/test_paginated_lineage.py 25 KB runs code
- tests/test_pre_envelope_rollout.py 5.7 KB runs code
- tests/test_prompt_cursor.py 3.4 KB runs code
- tests/test_read_codex_session.py 72 KB runs code
- tests/test_reader_metadata_lookup.py 14 KB runs code
- tests/test_reconcile_codex_inputs.py 26 KB runs code
- tests/test_streaming_validation.py 23 KB runs code
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 Changed · +10 lines 4b32436779ad
- 8d ago Changed · +57 lines 881ec87cbe5d
- 10d ago Changed · +18 lines 9ddd727d11cb
- 11d ago Changed · +35 lines 4156bce47fdc
- 22d ago Changed · -1 lines ce588d1ce696
- 28d ago Changed · +4 lines 1674a783bcb7
- 1mo ago Changed · +11 lines 7eb9366df55c
- 1mo ago Changed · +44 lines e12997eaad64
- 1mo ago Changed · +25 lines f4e51d5d1463
- 1mo ago First seen · 261 lines · 90 tokens per session scan A 73e82770dee0
read-codex-history is a skill published in the GitHub repository daymade/claude-code-skills (1,516 stars, last pushed yesterday), licensed MIT. It adds 90 tokens to every session and 6,438 once invoked, about $0.0004 per session on Opus 5.5. 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.
read-codex-history compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| read-codex-historydaymade/claude-code-skills | Skill | 1.5k | yesterday | MIT | A | 90 | Claude Code |
| imagegenopenai/codex | Skill | 133k | yesterday | Apache-2.0 | A | 113 | Codex |
| playwright-climicrosoft/playwright | Skill | 99k | yesterday | Apache-2.0 | A | 19 | Claude Code |
| local-ai-agentsmicrosoft/ai-agents-for-beginners | Skill | 79k | 4d ago | MIT | A | 200 | Claude Code, Codex |
| systematic-debuggingobra/superpowers | Skill | 313k | 3d ago | MIT | A | 21 | Claude Code |
| next-cache-components-adoptionvercel/next.js | Skill | 143k | yesterday | MIT | A | 95 | Claude Code |
| next-partial-prefetching-adoptionvercel/next.js | Skill | 143k | yesterday | MIT | A | 103 | Claude Code |