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 monkilabs/opencastle --skill observability-logginggit clone --depth 1 https://github.com/monkilabs/opencastleWrote 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/monkilabs/opencastle/observability-logging)<a href="https://agentmods.dev/skills/monkilabs/opencastle/observability-logging"><img src="https://agentmods.dev/badge/skills/monkilabs/opencastle/observability-logging/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/monkilabs/opencastle/observability-logging"><img src="https://agentmods.dev/badge/skills/monkilabs/opencastle/observability-logging.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 | $0.00074 | $0.00853 |
| Opus 5 | $0.00037 | $0.00426 |
| Sonnet 5 | $0.00015 | $0.00171 |
| Haiku 4.5 | $0.00007 | $0.00085 |
Grade A, and why
observability-logging scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 74 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Observability Logging
⛔ HARD GATE. Every agent MUST log every session to
events.ndjsonbefore responding. No exceptions. Session without logs is a failed session.
| File | Event types | Who | When |
|---|---|---|---|
events.ndjson |
session, delegation, review, panel, dispute |
All agents / Team Lead / Panel runner | After each applicable event |
See .opencastle/logs/README.md for full schema.
Use opencastle log CLI. One record per task; never batch-log retrospectively.
Session (ALL agents, EVERY session):
opencastle log --type session --agent Developer --model "$MODEL" \
--task "Fix login redirect bug" --outcome success --duration_min 15 \
--files_changed 3 --retries 0
Delegation (Team Lead, after each delegation — never batched):
opencastle log --type delegation --session_id feat/prj-57 --agent Developer \
--model "$MODEL" --tier standard --mechanism sub-agent \
--tracker_issue PRJ-57 --outcome success --retries 0 --phase 2 \
--file_partition "src/components/"
tiermust match the delegated agent's tier in the agent registry.modelis whatever the assistant actually used — leave it out if it did not report one.
Review (Team Lead, after each fast review):
opencastle log --type review --tracker_issue PRJ-42 --agent Developer \
--reviewer_model "$MODEL" --verdict pass --attempt 1 \
--issues_critical 0 --issues_major 0 --issues_minor 2 \
--confidence high --escalated false --duration_sec 45
Panel (Panel runner, after each vote):
opencastle log --type panel --panel_key auth-review --verdict pass \
--pass_count 3 --block_count 0 --must_fix 0 --should_fix 3 \
--reviewer_model "$MODEL" --weighted false --attempt 1 \
--tracker_issue PRJ-42 --artifacts_count 5
Dispute (Team Lead, after each dispute):
opencastle log --type dispute --dispute_id DSP-001 --tracker_issue PRJ-42 \
--priority high --trigger panel-3x-block --implementing_agent Developer \
--reviewing_agents "Reviewer,Panel (3x)" --total_attempts 6 --status pending
Verify any append: tail -1 .opencastle/logs/events.ndjson
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.
- 5d ago First seen · 74 lines · 74 tokens per session scan A 9891b94bfaf9
observability-logging is a skill published in the GitHub repository monkilabs/opencastle (61 stars, last pushed 11d ago), licensed MIT. It adds 74 tokens to every session and 853 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 2026-09-03.
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