Opik is an open-source platform for tracing, evaluating, and monitoring applications that use large language models, retrieval systems, or AI agents. Teams use it to inspect agent activity, manage prompts, run evaluations, and monitor these applications in production.
Borrowing it
Nothing to install: this file belongs to comet-ml/opik. 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/comet-ml/opik/main/.agents/skills/local-dev/SKILL.mdgit clone --depth 1 https://github.com/comet-ml/opikWrote 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/comet-ml/opik/local-dev)<a href="https://agentmods.dev/skills/comet-ml/opik/local-dev"><img src="https://agentmods.dev/badge/skills/comet-ml/opik/local-dev/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/comet-ml/opik/local-dev"><img src="https://agentmods.dev/badge/skills/comet-ml/opik/local-dev.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Tool Misuse · line 85 Tool calls are chained to bypass individual safety checks or escalate capabilities beyond what any single tool call would allow.Fix: Limit tool chaining depth and validate the output of each tool before passing it to the next. Require explicit user approval for multi-step chains.
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 | $0.00023 | $0.00799 |
| Opus 5.5 | $0.00009 | $0.00320 |
| Sonnet 5.5 | $0.00005 | $0.00160 |
| Haiku 4.5 | $0.00002 | $0.00080 |
Grade C, and why
local-dev scanned grade C with 1 finding 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 2mo 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.
Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
cd apps/opik-frontend && rm -rf node_modules && npm install How it starts
The opening of the file, as written. The whole thing — 94 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Local Development
Quick Start
./scripts/dev-runner.sh --restart # First time / full rebuild
./scripts/dev-runner.sh --start # Daily start (no rebuild)
./scripts/dev-runner.sh --stop # Stop everything
./scripts/dev-runner.sh --verify # Check status
Modes
| Mode | Command | Frontend | Use When |
|---|---|---|---|
| Standard | --restart |
localhost:5174 | Frontend work, full-stack |
| BE-only | --be-only-restart |
localhost:5173 | Backend-focused, faster rebuilds |
| Platform (EM) | PLATFORM_ENABLED=true ./scripts/dev-runner.sh --restart |
localhost:9100 | Opik-team only: run Opik connected to the Comet Platform |
Platform (EM) mode — Opik-team only
PLATFORM_ENABLED=true runs the Comet EM/Platform stack (comet-backend +
comet-react, auto-detected sibling checkouts) alongside Opik behind a
single-origin nginx proxy, with Opik in comet mode authenticating/resolving
workspaces via comet-backend. Off by default — Standard/BE-only dev is
unaffected. comet-backend builds under a detected JDK 17/21; Opik still uses JDK 25.
PLATFORM_ENABLED=true ./scripts/dev-runner.sh --restart # then also --start/--stop/--verify
# Integrated UI: http://localhost:9100 (comet-react / Platform)
# http://localhost:9100/opik (Opik, comet mode)
Env vars (COMET_BACKEND_PATH, COMET_REACT_PATH, PLATFORM_JAVA_HOME, PLATFORM_*_PORT)
and --platform-build are documented in ./scripts/dev-runner.sh --help.
URLs
- Frontend: localhost:5174 (standard) / localhost:5173 (BE-only)
- Backend API: localhost:8080
- Health: http://localhost:8080/health-check?name=all
Build Commands
./scripts/dev-runner.sh --build-be # Backend only
./scripts/dev-runner.sh --build-fe # Frontend only
./scripts/dev-runner.sh --lint-be # Spotless
./scripts/dev-runner.sh --lint-fe # ESLint
./scripts/dev-runner.sh --migrate # DB migrations
Logs
tail -f /tmp/opik-backend.log # Backend
tail -f /tmp/opik-frontend.log # Frontend (standard)
docker logs -f opik-frontend-1 # Frontend (BE-only)
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.
- 2mo ago First seen · 94 lines · 23 tokens per session scan C 60b225f3ef00
local-dev is a skill published in the GitHub repository comet-ml/opik (22,998 stars, last pushed today), licensed Apache-2.0. It adds 23 tokens to every session and 799 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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