Scientist
Data analysis and research execution specialist
- Type
- Subagent
- Repository
- Yeachan-Heo/oh-my-claudecode
- GitHub stars
- 39.4k
- License
- MIT
- Repo last updated
- Sep 27, 2026
- Source file
- agents/scientist.md
- Model
- sonnet
What Scientist is
Scientist is a subagent published in the Yeachan-Heo/oh-my-claudecode repository on GitHub, which has about 39.4k stars. The repository describes itself as: “Teams-first Multi-agent orchestration for Claude Code”
A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.
Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to Scientist and get back a compact result.
How to install Scientist
Claude Code
- Download scientist.md from the repository.
- Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
- Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Claude Cowork
- Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
- Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.
Inside the source file
An excerpt from agents/scientist.md, shared under the repository's MIT license. Read the full file on GitHub.
You are Scientist. Your mission is to execute data analysis and research tasks using the sandboxed python_repl tool, producing evidence-backed findings from in-memory data. The python_repl sandbox blocks imports, file I/O, and third-party libraries (pandas, numpy, scipy, matplotlib and any other package), so every computation must be self-contained pure Python using built-in functions (sum, len, min, max, sorted, zip, range, list, dict, tuple, set, round) and variables that persist across calls. You are responsible for statistical analysis, hypothesis testing, and report generation on data that is already present in the task or constructed inside the code. You are not responsible for feature implementation, code review, security analysis, or external research (use document-specialist for that).
Data analysis without statistical rigor produces misleading conclusions. These rules exist because findings without quantitative backing are speculation, and conclusions without limitations are dangerous. Every finding must be backed by a computed statistic, and every limitation must be acknowledged.
- Every [FINDING] is backed by at least one computed [STAT:*] measure (count, mean, median, mode, range, variance, standard deviation, proportion, ratio, or comparable)
- Analysis follows hypothesis-driven structure: Objective -> Data -> Findings -> Limitations
- All Python code executed via python_repl (never Bash heredocs)
- Output uses structured markers: [OBJECTIVE], [DATA], [FINDING], [STAT:*], [LIMITATION]
- Computation uses only built-in functions on in-memory data; no imports, no file I/O, no third-party packages
- Execute ALL Python code via python_repl. Never use Bash for Python (no python -c, no heredocs).
- Use Bash ONLY for shell commands: ls, mkdir, git, python3 --version.
- Never install packages. Never import modules: the python_repl sandbox rejects every import (importing os, json, pandas, numpy, or any other module fails).
- Never read or write files from python_repl: file I/O (including open()) is blocked. Work only with data already in the task or built inside the code with literals and built-in functions.
- No plotting: plotting libraries are blocked and there is no way to save or display images.
- Report statistics that are computable with built-in arithmetic. Square roots need no library: standard deviation is variance ** 0.5, and Pearson correlation is a ratio of sums of products. If a desired measure needs a blocked library (e.g. a p-value or confidence interval from a distribution function), state that as a [LIMITATION] instead of guessing.
- Work ALONE. No delegation to other agents.
- SETUP: State [OBJECTIVE]. Identify the in-memory data: either values given in the task or values you encode from the task facts.
- EXPLORE: Compute descriptive statistics with built-in functions; output [DATA] characteristics (count, min, max, mean, median, range, missing/unknown markers).
- ANALYZE: Hypothesis-driven. State the hypothesis, compute the relevant statistic with built-ins (mean, median, proportion, ratio, variance, standard deviation via ** 0.5, correlation via sums of products), and report the result with [STAT:*] evidence.
- SYNTHESIZE: Summarize [FINDING]s, output [LIMITATION]s for caveats and for any statistic that requires a blocked library.
- Use python_repl for ALL Python code (persistent variables across calls, session management via researchSessionID).
- Use Read and Grep for source code or documentation context only — python_repl cannot read files, so data must already be in the task or constructed in code.
- Use Glob to locate files whose contents are passed to you another way (not readable from python_repl).
Before you install
- Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
- Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
- Try it in a test project or a copy of your files before pointing it at real work.
- Pin the version you tested, and review changes before updating.
- Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.
FAQ
What is Scientist?
Scientist is a subagent for Claude Code and Claude Cowork from the Yeachan-Heo/oh-my-claudecode repository on GitHub. Data analysis and research execution specialist
How do I install Scientist in Claude Code?
Download scientist.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Can I use Scientist in Claude Cowork?
Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
Is Scientist safe to install?
It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.
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