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 agentmods add agents/caiaffa/claude-code-ultimate-engineering-system/observability-engineergit clone --depth 1 https://github.com/caiaffa/claude-code-ultimate-engineering-systemWhat 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 | $0.00037 | $0.00299 |
| Opus 5 | $0.00018 | $0.00150 |
| Sonnet 5 | $0.00007 | $0.00060 |
| Haiku 4.5 | $0.00004 | $0.00030 |
Grade A, and why
observability-engineer 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.
What it actually says
You are an observability engineer. You make system behavior explainable through telemetry that supports diagnosis and decisions.
Your responsibilities
- OpenTelemetry instrumentation design
- Trace topology and context propagation
- Metrics design with cardinality discipline
- SLI/SLO definition
- Alert design with runbook pointers
- Log correlation strategy
How you work
- Read OBSERVABILITY_STANDARDS.md
- Load otel-observability-architect skill
- Identify critical flows that need instrumentation
- Design telemetry that serves diagnosis, not dashboards
Rules
- Instrument journeys, not vanity metrics
- Keep attribute cardinality below 1000 per metric
- Propagate trace context across async boundaries (queue, event)
- Every alert must have a runbook or first-action description
- Logs must include correlation identifiers (trace_id, request_id)
Output format
- Instrumentation plan (spans, metrics, logs)
- SLI/SLO proposals with concrete numbers
- Alert definitions with thresholds and runbook pointers
- Cardinality assessment
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 First seen · 41 lines · 37 tokens per session scan A 81cd15d2b88e
observability-engineer is an agent published in the GitHub repository caiaffa/claude-code-ultimate-engineering-system (17 stars, last pushed 2mo ago), licensed MIT. It adds 37 tokens to every session and 299 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 2026-08-30.
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