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 jasonkneen/lazar --skill harnessgit clone --depth 1 https://github.com/jasonkneen/lazarWrote 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/jasonkneen/lazar/harness)<a href="https://agentmods.dev/skills/jasonkneen/lazar/harness"><img src="https://agentmods.dev/badge/skills/jasonkneen/lazar/harness/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/jasonkneen/lazar/harness"><img src="https://agentmods.dev/badge/skills/jasonkneen/lazar/harness.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 | $0.00073 | $0.00715 |
| Opus 5 | $0.00036 | $0.00358 |
| Sonnet 5 | $0.00015 | $0.00143 |
| Haiku 4.5 | $0.00007 | $0.00072 |
Grade A, and why
harness 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.
How it starts
The opening of the file, as written. The whole thing — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Continual harness
Prime-agent-style persistent layer for lazar. One store, compact overview
always injected by hooks/session-start.d/00-harness-overview.sh.
Paths
- Global state:
$LAZAR_HOME/memory/harness/state.json - History:
$LAZAR_HOME/memory/harness/history.jsonl - Local (session):
$LAZAR_HOME/memory/sessions/<id>/harness.json - CLI:
python3 $LAZAR_HOME/skills/_meta/harness/harness.py
Kinds
| Kind | Use for |
|---|---|
memory |
Durable facts, prefs, pitfalls |
skill |
Pointers to procedures / when-to-use a skill |
prompt |
Narrow behavioral addenda (not full SOUL rewrites) |
subagent |
Delegation recipes for lazar-spawn |
Scope
global(default) — cross-sessionlocal— thisLAZAR_SESSION_IDonly
Commands
# Compact overview (what session-start injects)
python3 $LAZAR_HOME/skills/_meta/harness/harness.py overview
# Record a lesson after success/failure
python3 $LAZAR_HOME/skills/_meta/harness/harness.py add \
--kind memory \
--title "short-slug" \
--content "Specific actionable lesson" \
--evidence "what happened"
# Load full entry; optional upvote
python3 $LAZAR_HOME/skills/_meta/harness/harness.py load M-never-cat-stream-log --helpful
python3 $LAZAR_HOME/skills/_meta/harness/harness.py helpful <id>
python3 $LAZAR_HOME/skills/_meta/harness/harness.py unhelpful <id>
python3 $LAZAR_HOME/skills/_meta/harness/harness.py delete <id>
# First-time / refresh seed (+ import playbook + learnings)
python3 $LAZAR_HOME/skills/_meta/harness/harness.py seed
python3 $LAZAR_HOME/skills/_meta/harness/harness.py stats
Rules
- Smallest edit. One concrete lesson beats a paragraph dump.
- Evidence. Prefer
--evidencewhen refining from a real failure/success. - Global only if stable. Session-only progress →
--scope local(needs session id). - Do not duplicate.
addskips near-duplicate content unless--force. - Score usage. When an injected bullet actually helped,
helpful <id>. - Still write long provenance to
memory/distilled/if needed — harness holds the ranked actionable slice.
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.
- 10d ago First seen · 73 lines · 73 tokens per session scan A 02e12956366a
harness is a skill published in the GitHub repository jasonkneen/lazar (31 stars, last pushed 28d ago), licensed MIT. It adds 73 tokens to every session and 715 once invoked, about $0.0004 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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