Opik

What it does

When your agent uses it

• What span types exist
• Version a prompt

Example prompts

• “what span types exist”
• “how do I flush”
• “trackopenai”
• “/opik”

Requirements

• Python 3
• Compatibility (from SKILL.md): Tested with Claude Code; works with any Agent Skills-compatible host (Cursor, VS Code Copilot, Codex). A reference — needs no Opik connection to read; the snippets assume the `opik` Python or TypeScript SDK 2.x. The task-shaped skills (opik-instrument, opik-diagnose, opik-explain, opik-test, opik-compare, opik-evaluate, opik-online-eval, opik-optimize, opik-verify) read this skill's references and expect it installed beside them.
• Pre-approved tools (allowed-tools): Read, Grep, Glob

What it can do on your machine

Read from SKILL.md and the folder at commit f1dd464. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Read
  • Grep
  • Glob

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are python and typescript).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

• Compatibility

  Tested with Claude Code; works with any Agent Skills-compatible host (Cursor, VS Code Copilot, Codex). A reference — needs no Opik connection to read; the snippets assume the `opik` Python or TypeScript SDK 2.x. The task-shaped skills (opik-instrument, opik-diagnose, opik-explain, opik-test, opik-compare, opik-evaluate, opik-online-eval, opik-optimize, opik-verify) read this skill's references and expect it installed beside them.

  From compatibility in the SKILL.md frontmatter.

Context cost

Opik loads about 2.1k tokens when it runs, and up to ~34k if it reads all its reference files. Until then it costs about 77 tokens; SKILL.md has 635 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~77

When it runs · the whole SKILL.md, loaded when a task matches

~2.1k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~34k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from comet-ml/opik-mcp at commit f1dd464, republished under its Apache-2.0 licence (© comet-ml). 635 words, ~2,105 tokens.

name

opik

description

Reference for the Opik SDK — tracing, span types, framework integrations, threads, and the prompt library (Python, TypeScript, REST). Use for "what span types exist", "how do I flush", "track_openai", "add OpikTracer", "version a prompt". To instrument a repo end to end, use the `opik-instrument` skill.

allowed-tools

Read, Grep, Glob

compatibility

Tested with Claude Code; works with any Agent Skills-compatible host (Cursor, VS Code Copilot, Codex). A reference — needs no Opik connection to read; the snippets assume the `opik` Python or TypeScript SDK 2.x. The task-shaped skills (opik-instrument, opik-diagnose, opik-explain, opik-test, opik-compare, opik-evaluate, opik-online-eval, opik-optimize, opik-verify) read this skill's references and expect it installed beside them.

metadata.last_updated

2026-09-17

metadata.source_commit

2.0.0

import opik


@opik.track(name="agent", type="general")
def agent(query: str) -> str:
    return generate(retrieve(query))


@opik.track(type="tool")
def retrieve(query): ...


@opik.track(type="llm")
def generate(ctx): ...


opik.flush_tracker()  # required in scripts

import { Opik } from "opik";
const client = new Opik({ projectName: "my-project" });

const trace = client.trace({ name: "agent", input: { query } });
const span = trace.span({ name: "llm-call", type: "llm" });
span.end({ output });
trace.end({ output });
await client.flush();

from opik.opik_context import get_current_span_data


@opik.track
def call_llm(messages):
    return litellm.completion(
        model="gpt-4o",
        messages=messages,
        metadata={"opik": {"current_span_data": get_current_span_data()}},
    )

@opik.track(entrypoint=True)
def handle(session_id: str, message: str) -> str:
    opik.update_current_trace(thread_id=session_id)
    return reply(message)

@opik.track(entrypoint=True)
def run(question: str) -> str:
    p = client.get_prompt(name="system") or client.create_prompt(
        name="system",
        prompt="You help with {{product}}.",
        metadata={"model": "gpt-4o", "temperature": 0.7},
    )
    return llm(p.format(product="Opik"), model=p.metadata["model"])

read("project", "<project name or id>")

list("project_metric", project_name="<project>", metric_type="trace_cost")
list("project_metric", project_name="<project>", metric_type="span_count",
     breakdown="model", since="30d")

<field>[.<key>] <op> <value> [AND ...]
ops: = != > >= < <= contains not_contains starts_with ends_with is_empty is_not_empty in not_in

error_info is_not_empty AND duration > 5000
type = "llm" AND usage.total_tokens > 10000            # spans
feedback_scores.hallucination > 0.5 AND start_time >= "2026-09-08T00:00:00Z"

list(entity_type="trace", project_name="<project>", since="1h",
     filters="error_info is_not_empty", sort="duration desc")

client.search_traces(project_name="<project>", filter_string="error_info is_not_empty")

© comet-ml, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 10 other files (references) in src/opik_mcp/skills/opik of comet-ml/opik-mcp.

• SKILL.md
• references/agent-patterns.md
• references/best-practices.md
• references/evaluation-datasets.md
• references/evaluation-test-suites.md
• references/integrations.md
• references/observability.md
• references/production.md
• references/tracing-python.md
• references/tracing-rest-api.md
• references/tracing-typescript.md

Open the folder on GitHubat commit f1dd464