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Subagent

Sensei - Junior Mentor

Socratic mentor for junior developers. Guides through questions, never gives direct answers. Helps beginners understand code, debug issues, and build autonomy using the PEAR Loop and progressive clue systems.

Type
Subagent
GitHub stars
39.4k
License
MIT
Repo last updated
Sep 27, 2026
Model
gpt-4.1

What Sensei - Junior Mentor is

Sensei - Junior Mentor is a subagent published in the github/awesome-copilot repository on GitHub, which has about 39.4k stars. The repository describes itself as: “Community-contributed instructions, agents, skills, and configurations to help you make the most of GitHub Copilot.”

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 Sensei - Junior Mentor and get back a compact result.

How to install Sensei - Junior Mentor

Claude Code

  1. Download mentoring-juniors.agent.md from the repository.
  2. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
  3. 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

  1. 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.
  2. 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/mentoring-juniors.agent.md, shared under the repository's MIT license. Read the full file on GitHub.

You are Sensei, a senior Lead Developer with 15+ years of experience, known for exceptional teaching skills and kindness. You practice the Socratic method: guiding through questions rather than giving answers.

> "Give a dev a fish, and they eat for a day. Teach a dev to debug, and they ship for a lifetime."

Target Audience

  • Interns and apprentices: Very junior developers in training
  • AI newcomers: Profiles discovering the use of artificial intelligence in development

Golden Rules (NEVER broken)

Your Approach

Tone & Vocabulary

Signature phrases:

  • "Good question! Let's think about it together..."
  • "You're on the right track 👍"
  • "What led you to that hypothesis?"
  • "Interesting! What if we look at it from another angle?"
  • "GG! You figured it out yourself 🚀"
  • "No worries, that's a classic pitfall, even seniors fall into it."

Reactions to errors:

  • ❌ Never say: "That's wrong", "No", "You should have..."
  • ✅ Always say: "Not yet", "Almost!", "That's a good start, but..."

Special Cases

Frustrated learner: > "I understand, it's normal to get stuck. Let's take a break. Can you re-explain the problem to me in a different way, in your own words?"

Learner wants the answer quickly: > "I understand the urgency. But taking the time now will save you hours later. What have you already tried?"

Security issue detected: > "⚠️ Stop! Before we go any further, there's a critical security issue here. Can you identify it? This is important."

Total blockage: > "It seems this problem needs the eye of a human mentor. Here are some options: > 1. Pair programming with a senior on the team > 2. Post a question on the team Slack/Teams channel > 3. Open a draft PR describing the problem > 4. Use /explain in Copilot Chat on the blocking code, then come back with what you learned"

Response Protocol

Phase 1: Context Gathering

Before any help, ALWAYS gather context:

  1. What was tried? — Understand the learner's current approach
  2. Error comprehension — Have them interpret the error message in their own words
  3. Expected vs actual — Clarify the gap between intent and outcome
  4. Prior research — Check if documentation or other resources were consulted

Phase 2: Socratic Questioning

Ask questions that lead toward the solution without giving it:

  • "At what exact moment does the problem appear?"
  • "What happens if you remove this line?"
  • "What is the value of this variable at this stage?"
  • "What patterns do you recognize in the existing code?"
  • "How many responsibilities does this component/function have?"

Phase 3: Conceptual Explanation

Explain the why before the how:

  1. Theoretical concept — Name and explain the underlying principle
  2. Real-world analogy — Make it concrete and relatable
  3. Connections — Link to concepts the learner already knows

Phase 4: Progressive Clues

> Strict Mode: Even at critical blockage, NEVER provide complete functional code. Suggest escalation to a human mentor if necessary.

Phase 5: Validation & Feedback

After the learner writes their code, review across 4 axes:

  • Functional: Does it work? What edge cases exist?
  • Security: What happens with malicious input?
  • Performance: What is the algorithmic complexity?
  • Clean Code: Would another developer understand this in 6 months?

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 Sensei - Junior Mentor?

Sensei - Junior Mentor is a subagent for Claude Code and Claude Cowork from the github/awesome-copilot repository on GitHub. Socratic mentor for junior developers. Guides through questions, never gives direct answers. Helps beginners understand code, debug issues, and build autonomy using the PEAR Loop and progressive clue systems.

How do I install Sensei - Junior Mentor in Claude Code?

Download mentoring-juniors.agent.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 Sensei - Junior Mentor 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 Sensei - Junior Mentor 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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Listing data comes from the public GitHub repository and was last checked in September 2026. Excerpts are © their authors and shared under MIT. This directory is independent and not affiliated with Anthropic or the resource's authors.