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 comet-ml/opik-mcp --skill opik-comparegit clone --depth 1 https://github.com/comet-ml/opik-mcpWrote 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-mcp/opik-compare)<a href="https://agentmods.dev/skills/comet-ml/opik-mcp/opik-compare"><img src="https://agentmods.dev/badge/skills/comet-ml/opik-mcp/opik-compare/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-mcp/opik-compare"><img src="https://agentmods.dev/badge/skills/comet-ml/opik-mcp/opik-compare.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 | $0.00156 | $0.02555 |
| Opus 5.5 | $0.00062 | $0.01022 |
| Sonnet 5.5 | $0.00031 | $0.00511 |
| Haiku 4.5 | $0.00016 | $0.00255 |
Grade A, and why
opik-compare scanned grade A 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 1mo 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
import json, urllib.parse Copies of this mod
2 near-identical copies found in the catalogue:
- opik-compare — 100% identical, 77 lines differ
- opik-compare — 98% identical, 77 lines differ
How it starts
The opening of the file, as written. The whole thing — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Compare — Candidate vs Baseline Over a Suite
Definition of done: two experiments on the same suite — a baseline and a candidate — read back item by item, with the per-metric deltas, the cases that went pass → fail (regressions) and fail → pass (fixes), the worst rows, a note on whether the runs are comparable, and the Opik compare-view link. If only one run exists, the done state is "baseline created — rerun after the change". If the suite can't be run or read, stop at the first genuine blocker and return exactly one next step. Aggregate scores alone are not a comparison; a verdict is not this skill's job.
Operate: run the candidate the same way the baseline was run, read both back from Opik rather than from the run's console output, name the specific cases that changed — and change no application code. The only file this skill writes is a throwaway runner outside the repo.
Inputs
The entry point is /opik-compare <suite> (run the suite now as the candidate, compare against the latest prior run), /opik-compare <experiment-A> <experiment-B> (read two existing runs, no new run), or /opik-compare right after /opik-test (that suite). Infer the rest; treat these as optional overrides:
- suite (default:
<project>-regressions, or the one/opik-testjust wrote to) · baseline (default: the most recent earlier experiment on the suite) · candidate name (default:candidate-<short git sha>) · judge model for assertions (default: the suite's / the baseline's) · runs per item (default: the suite's policy).
Ask only at a genuine, non-inferable blocker (see Blockers).
Activation — the only in-scope work
1. Resolve the suite and the baseline
The SDK calls: references/sdk-snippets.md (Resolve the suite and the baseline). Newest first is not guaranteed — sort the prior experiments by created_at yourself.
Baseline = the most recent prior experiment on this suite, unless the user names one. No prior experiment → this run is the baseline (step 3 still runs; status baseline_created). Two explicit experiments → skip step 3, go to step 4.
What ships with it
3 files 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.
- 1mo ago Changed · -76 lines 99e50dd0e78a
- 1mo ago Changed · +15 lines 0675f445d69d
- 1mo ago Changed b2f3fe93578c
- 1mo ago Changed · +1 lines · +10 tokens per session 0dbe6d16e887
- 1mo ago First seen · 173 lines · 146 tokens per session scan A 73786774ec0e
opik-compare is a skill published in the GitHub repository comet-ml/opik-mcp (226 stars, last pushed today), licensed Apache-2.0. It adds 156 tokens to every session and 2,555 once invoked, about $0.0006 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-18.
opik-compare compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| opik-comparecomet-ml/opik-mcp | Skill | 226 | today | Apache-2.0 | A | 156 | Claude Code |
| cortex-explore-memorycdeust/Cortex | Skill | 77 | today | MIT | A | 91 | Claude Code |
| qmclaw-workbenchxi-zhao/OpenQuantum | Skill | 72 | 3d ago | MIT | A | 124 | Codex |
| quantum-groverxi-zhao/OpenQuantum | Skill | 72 | 3d ago | MIT | A | 62 | Claude Code, Codex |
| quantum-algorithmsxi-zhao/OpenQuantum | Skill | 72 | 3d ago | MIT | A | 34 | Claude Code, Codex |
| alicebob-cat-circuitsxi-zhao/OpenQuantum | Skill | 72 | 3d ago | MIT | A | 51 | Claude Code, Codex |
| guppy-programsxi-zhao/OpenQuantum | Skill | 72 | 3d ago | MIT | A | 48 | Claude Code, Codex |