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 agentmods add skills/sipyourdrink-ltd/bernstein/bernstein-plannpx skills add sipyourdrink-ltd/bernstein --skill bernstein-plangit clone --depth 1 https://github.com/sipyourdrink-ltd/bernsteinWhat 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 | $0.00051 | $0.00601 |
| Opus 5 | $0.00026 | $0.00300 |
| Sonnet 5 | $0.00010 | $0.00120 |
| Haiku 4.5 | $0.00005 | $0.00060 |
Grade A, and why
bernstein-plan scanned grade A with 0 findings 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 yesterday.
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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Bernstein Plan Mode
Create structured execution plans that get human approval before agents start.
When to Use
- User describes a complex feature: "implement user authentication with OAuth"
- User wants to break down a large task into stages
- User says "plan this out" or "create a plan for..."
- User wants to review what agents will do before they start
Instructions
Creating a plan
- Analyze the user's request and decompose it into stages and tasks.
- Write a plan YAML file using this structure:
name: "{descriptive plan name}"
description: "{what this plan achieves}"
stages:
- name: foundation
steps:
- goal: "Create database models for user and session"
role: backend
scope: small
complexity: low
- goal: "Add migration scripts"
role: backend
scope: tiny
- name: implementation
depends_on: [foundation]
steps:
- goal: "Implement OAuth2 flow with Google provider"
role: backend
scope: medium
complexity: medium
- goal: "Create login/signup UI components"
role: frontend
scope: medium
- name: verification
depends_on: [implementation]
steps:
- goal: "Write integration tests for auth flow"
role: qa
scope: medium
- goal: "Security review of token handling"
role: security
scope: small
- Save the plan to
plans/{plan-name}.yamlin the project root. - Tell the user to execute it:
bernstein run plans/{plan-name}.yaml
Or submit via API
- Run
scripts/plan.sh submit plans/{plan-name}.yamlto submit for approval. - The plan enters
pendingstate - use/bernstein-approveto review and approve. - Once approved, planned tasks promote to
openand agents start picking them up.
Reviewing plans
- Run
scripts/plan.sh listto see all plans and their status. - Show the plan with stages, dependencies, and estimated cost/time.
Tips
- Keep stages to 2-5 tasks each
- Use
depends_onto enforce ordering (foundation before implementation) - Assign appropriate roles: backend, frontend, qa, security, devops, docs
- Mark risky tasks with
complexity: high- they'll get more capable models - Foundation stages should be
tinyorsmallscope
What ships with it
1 file 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.
- yesterday First seen · 85 lines · 51 tokens per session scan A b1f48eba1d84
bernstein-plan is a skill published in the GitHub repository sipyourdrink-ltd/bernstein (1,038 stars, last pushed today), licensed Apache-2.0. It adds 51 tokens to every session and 601 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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