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Agent skill

Efficient Frontier

by BuilderIO in BuilderIO/skills

Apply the same orchestration as /efficient-fable to any high-cost frontier model: delegate research, coding, and testing to cheaper subagents while keeping planning, synthesis, and final review with…

MITAuto-check passedAgent Workflows

Install Efficient Frontier

skills CLI
$ npx skills add BuilderIO/skills --skill efficient-frontier -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install BuilderIO/skills efficient-frontier --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/BuilderIO/skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/efficient-frontier .claude/skills/efficient-frontier && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
efficient-frontier
GitHub stars
4.5k
Token cost
~856 tokens
SKILL.md length
433 words
Files
2
Skills in repo
25
Repo updated
First seen
Licence
MIT

At a glance

Apply the same orchestration as /efficient-fable to any high-cost frontier model: delegate research, coding, and testing to cheaper subagents while keeping planning, synthesis, and final review with…

  • Works in 5 steps: Identify the frontier-only decisions:… → Identify delegable work: research scans,… → Spawn parallel subagents for independent… → …
  • Tasks that involve Subagents
  • SKILL.md covers Workflow, Handoff Packets, Review Loop and Common Scenarios, plus 2 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Efficient Frontier is an agent skill from BuilderIO/skills. Apply the same orchestration as /efficient-fable to any high-cost frontier model: delegate research, coding, and testing to cheaper subagents while keeping planning, synthesis, and final review with the expensive model.

Its SKILL.md is about 860 tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `README.md`).

It sits in Agent Workflows, covering Subagents. The licence is MIT.

When your agent uses it

  • Tasks that involve Subagents

Example prompts

  • “/efficient-frontier”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Identify the frontier-only decisions: architecture, prioritization,
  2. Identify delegable work: research scans, repository inventory, search, docs
  3. Spawn parallel subagents for independent slices with clear ownership,
  4. Require compact returns: findings, changed files, commands run, residual
  5. Integrate and review centrally before presenting the result.

What it can do on your machine

Read from SKILL.md and the folder at commit 530d9ee. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    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.

Context cost

Efficient Frontier loads about 856 tokens when it runs. Until then it costs about 60 tokens; SKILL.md has 433 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~60
When it runs · the whole SKILL.md, loaded when a task matches
~856

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

Auto-check passed

The automated check found no risky patterns in SKILL.md.

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 BuilderIO/skills at commit 530d9ee, republished under its MIT licence (© BuilderIO). 433 words, ~856 tokens.

Download SKILL.mdSave it as .claude/skills/efficient-frontier/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
efficient-frontier
description
Apply the same orchestration as `/efficient-fable` to any high-cost frontier model: delegate research, coding, and testing to cheaper subagents while keeping planning, synthesis, and final review with the expensive model.

Efficient Frontier

Use the expensive frontier model where its marginal judgment matters. Push repeatable, bounded, or token-heavy work to cheaper/faster subagents.

Workflow

  1. Identify the frontier-only decisions: architecture, prioritization, ambiguity resolution, risk, synthesis, and final review.
  2. Identify delegable work: research scans, repository inventory, search, docs extraction, browser/testing passes, log reduction, test failure clustering, narrow coding, and mechanical edits.
  3. Spawn parallel subagents for independent slices with clear ownership, bounded scope, verification gates, and expected evidence.
  4. Require compact returns: findings, changed files, commands run, residual risk, stop conditions hit, and anything the frontier model must decide.
  5. Integrate and review centrally before presenting the result.

Handoff Packets

Write delegated prompts as self-contained packets. Assume the receiving agent has not seen the conversation. Include the repo path, objective, scope, out-of-scope areas, relevant files or search targets, expected return format, verification commands, and stop conditions.

Useful stop conditions:

  • The live code does not match the assumption in the handoff.
  • A verification command fails twice after a reasonable fix or retry.
  • The work appears to require files outside the assigned scope.
  • The agent cannot produce concrete evidence for its claim.

Review Loop

Treat delegated output as evidence to inspect, not a verdict to forward. Reopen important cited files, skim high-risk diffs, and rerun or spot-check the verification that matters before claiming completion. If delegated agents disagree, resolve the disagreement at the frontier-model layer.

Show full SKILL.md (202 more words)Show less

Common Scenarios

Use these as soft suggestions:

  • Research: delegate broad repo scans, docs extraction, and source comparison; the frontier model keeps the judgment about what matters.
  • Coding: delegate bounded patches, refactors, or mechanical edits when file ownership is clear; integrate and review centrally.
  • Testing: let the frontier model choose the validation strategy and scripts, then use cheaper agents to run unit checks, browser flows, screenshots, and log reduction. Ask them to return exact commands, failures, likely causes, and whether the signal looks flaky, environmental, or product-relevant.
  • Debugging: send independent agents after separate theories, logs, or repro paths; keep the final diagnosis with the frontier model.

Guardrails

  • Do not delegate the immediate blocker if your next step depends on it.
  • Do not ask multiple agents to edit the same files at the same time.
  • Do not trust subagent conclusions blindly when the risk is high; inspect the important evidence yourself.
  • Do not claim universal savings. The pattern works best when exploration and implementation, testing, or research can be parallelized.

Default Framing

"I will use the frontier model as the orchestrator and reviewer, and use cheaper subagents for token-heavy research, coding, or testing so the expensive tokens go to judgment, synthesis, and final quality."

© BuilderIO, MIT. 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 1 other file in skills/efficient-frontier of BuilderIO/skills.

  • SKILL.md
  • README.md

Open the folder on GitHubat commit 530d9ee

Compare with similar skills

Efficient Frontier next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Efficient Frontier compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Efficient Frontier this skillBuilderIO/skills4.5k—~856Automated safety check: PassMIT
Claude Code Agent Developmentanthropics/claude-plugins-official37k8 repos~2.8kAutomated safety check: PassApache-2.0
Subagent Driven DevelopmentAsvarox/allkaraoke26137 repos~1.2kAutomated safety check: PassNone
Dispatching Parallel Agentsultralisp/ultralisp25840 repos~1.5kAutomated safety check: PassNone
Paseo Advisor Second Opiniongetpaseo/paseo20k1 repos~756Automated safety check: PassCustom licence
Task Observerrebelytics/one-skill-to-rule-them-all3.2k1 repos~12kAutomated safety check: PassCC-BY-4.0

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Categories

Questions about Efficient Frontier

What does Efficient Frontier do?

Apply the same orchestration as /efficient-fable to any high-cost frontier model: delegate research, coding, and testing to cheaper subagents while keeping planning, synthesis, and final review with…. Efficient Frontier is an agent skill from BuilderIO/skills. Apply the same orchestration as /efficient-fable to any high-cost frontier model: delegate research, coding, and testing to cheaper subagents while keeping planning, synthesis, and final review with the expensive model.

When should I use Efficient Frontier?

Efficient Frontier fits situations like: tasks that involve Subagents.

How do I install Efficient Frontier in Claude Code?

Run `npx skills add BuilderIO/skills --skill efficient-frontier -a claude-code`. Or copy the skill folder (skills/efficient-frontier in BuilderIO/skills) into .claude/skills/efficient-frontier in your project. Claude Code loads it when a task matches its description.

How do I install Efficient Frontier in Codex?

Run `npx skills add BuilderIO/skills --skill efficient-frontier -a codex`. Or copy the skill folder (skills/efficient-frontier in BuilderIO/skills) into .agents/skills/efficient-frontier in your project. Codex loads it when a task matches its description.

Can I use Efficient Frontier in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add BuilderIO/skills --skill efficient-frontier -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/efficient-frontier, .gemini/skills/efficient-frontier, .github/skills/efficient-frontier and .opencode/skills/efficient-frontier in your project.

What does Efficient Frontier need to run?

SKILL.md names no scripts, command-line tools or credentials: Efficient Frontier is instructions for the agent only.

Does Efficient Frontier access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Efficient Frontier safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Efficient Frontier use?

Efficient Frontier is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Efficient Frontier use?

About 856 tokens (SKILL.md is roughly 3.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Efficient Frontier?

Skills that share tags, products or a category with Efficient Frontier: Claude Code Agent Development (anthropics/claude-plugins-official, 37k stars), Subagent Driven Development (Asvarox/allkaraoke, 261 stars), Dispatching Parallel Agents (ultralisp/ultralisp, 258 stars) and Paseo Advisor Second Opinion (getpaseo/paseo, 20k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Efficient Frontier?

BuilderIO (a GitHub organization) maintains it in BuilderIO/skills, which has 4,528 GitHub stars. The repository holds 25 skills in this directory. The repository was last updated on October 7, 2026.

Source: BuilderIO/skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.