Borrowing it
Nothing to install: this file belongs to cboone/agent-harness-plugins. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/cboone/agent-harness-plugins/main/.github/instructions/codex-budget.instructions.mdgit clone --depth 1 https://github.com/cboone/agent-harness-pluginsWrote 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/instructions/cboone/agent-harness-plugins/codex-budget)<a href="https://agentmods.dev/instructions/cboone/agent-harness-plugins/codex-budget"><img src="https://agentmods.dev/badge/instructions/cboone/agent-harness-plugins/codex-budget/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/instructions/cboone/agent-harness-plugins/codex-budget"><img src="https://agentmods.dev/badge/instructions/cboone/agent-harness-plugins/codex-budget.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00233 | $0.00233 |
| Opus 5.5 | $0.00093 | $0.00093 |
| Sonnet 5.5 | $0.00047 | $0.00047 |
| Haiku 4.5 | $0.00023 | $0.00023 |
Grade A, and why
agent-harness-plugins codex-budget.instructions.md 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 10d 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.
What it actually says
Codex budget review instructions
These rule 17 patterns are intentional and have been checked:
- Rule 17 charges a share of listed skills, after withholding: A skill withheld from implicit invocation is excluded before the enabled share is taken, because Codex never lists it. Taking the share over the remaining listed skills is intentional; do not flag it as double counting or as under-charging withheld skills. The withheld-skill scrut case forces
CODEX_ENABLED_SKILL_PERCENT=100on purpose, so another skill cannot replace the withheld one among the counted share. - Piped scrut cases still assert exit status: A case written as
{ COMMAND; echo "exit ${?}"; } | awk ...records the fixture's own exit status as anexit Noutput line, which the expected output pins. The pipeline itself exits 0, so the block correctly has no[N]line. Do not flag it as dropping the exit status.
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.
- 10d ago First seen · 11 lines · 233 tokens per session scan A bd0d00c79051
agent-harness-plugins codex-budget.instructions.md is an instructions file published in the GitHub repository cboone/agent-harness-plugins (2 stars, last pushed 2d ago), licensed MIT. It adds 233 tokens to every session, about $0.0009 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 2026-10-07.
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