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 kitchen-engineer42/joharnessburg --skill endurance-goalgit clone --depth 1 https://github.com/kitchen-engineer42/joharnessburgWrote 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/kitchen-engineer42/joharnessburg/endurance-goal)<a href="https://agentmods.dev/skills/kitchen-engineer42/joharnessburg/endurance-goal"><img src="https://agentmods.dev/badge/skills/kitchen-engineer42/joharnessburg/endurance-goal/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/kitchen-engineer42/joharnessburg/endurance-goal"><img src="https://agentmods.dev/badge/skills/kitchen-engineer42/joharnessburg/endurance-goal.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 | $0.00045 | $0.00360 |
| Opus 5 | $0.00023 | $0.00180 |
| Sonnet 5 | $0.00009 | $0.00072 |
| Haiku 4.5 | $0.00005 | $0.00036 |
Grade A, and why
endurance-goal 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 11d 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
endurance-goal
This is the Codex equivalent of Claude Code's /john:endurance command.
When to use
Use this for long John runs that span many iterations, context compactions, or
fresh sessions. The goal is stored in .john/workspace.json under
session_metadata.endurance_goal.
Procedure
-
Parse the user's request:
- goal text: set the endurance goal
- no arguments: show the current endurance goal
--clear: remove the current endurance goal
-
Resolve the plugin root:
- In a Codex plugin install, this skill lives under
<plugin-root>/skills/endurance-goal/SKILL.md. - The script is at
<plugin-root>/scripts/set_endurance.py. - In a source checkout, use
plugins/joharnessburg/scripts/set_endurance.py.
- In a Codex plugin install, this skill lives under
-
Run the script from the user's project directory:
python3 "<plugin-root>/scripts/set_endurance.py" <goal-text-or---clear>
- Report the result:
- set: confirm the goal is written to
.john/workspace.json - clear: confirm the goal was removed
- show: print the current goal or say none is set
- set: confirm the goal is written to
In Codex, persistence depends on the project state and any enabled Codex
SessionStart hook. If hooks are not enabled, re-read .john/workspace.json
and PLAN.md at the start of a resumed run.
What ships with it
1 file 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.
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.
- 11d ago First seen · 42 lines · 45 tokens per session scan A 21bcc02dd0a7
endurance-goal is a skill published in the GitHub repository kitchen-engineer42/joharnessburg (9 stars, last pushed 2mo ago), licensed MIT. It adds 45 tokens to every session and 360 once invoked, about $0.0002 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 2026-08-31.
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