🍯 Honey (I Shrunk the AI)

Write less code and say less about it. Honey (I Shrunk the AI) by GreenPT is a cross-tool coding skill that cuts AI coding-agent token usage and LLM API costs — making agents emit less code and less prose without losing correctness. It works with Claude (claude.ai and the API), Claude Code, Cursor, GitHub Copilot, Codex, Gemini CLI, Windsurf, Cline, OpenClaw, Kiro, and Kilo Code. Three independent levers, applied reflexively:

Less code — YAGNI first. Walk a ladder (does it need to exist? → stdlib → language native → existing dependency → one line → minimum block) and stop at the first rung that works. The cheapest line is the one you never write.
Less prose — drop the wind-up, the hedging, the narration of code that already speaks for itself. Answer first.
Denser agent-to-agent handoffs — when the reader is another agent, not a human, hand it the most token-efficient format it parses losslessly (compact / columnar JSON, or ESON). Cuts handoff size ~in half at zero loss of recovery. Fires only here — never as a user-facing answer.

Honey combines what Ponytail (minimal code) and Caveman (terse prose) do separately, then goes further:

Auto-intensity — lite / full / ultra chosen reflexively from the request, with no deliberation tax (it never spends reasoning tokens deciding how to comply — that would defeat the purpose on reasoning models).
Safety carve-outs — input validation, error handling, auth, secrets, migrations, deletes, and anything you explicitly asked for are never compressed. Lazy ≠ broken.
A skill family, not one prompt — an always-on core plus on-demand satellites (review, eco, gain, compress) and a hive of read-only subagents that return compressed handoffs. See Skills & subagents.

Why

Volume is cost. In agentic coding sessions, the volume of generated code and prose is what runs up the bill — and most of it is waste.

This repo ships a reproducible benchmark (bench/) so you don't have to take the numbers on faith: 23 tasks across three kinds of work — baseline vs Caveman vs Ponytail vs Honey — same model, same prompts, only the skill changes. Correctness is objective (unit tests, structural / accessibility checks, and lossless round-trip recovery for agent handoffs); quality is scored by a 4-model cross-family judge panel (median of Opus 4.8 + Sonnet 4.6

Haiku 4.5 + GPT-5.5) under a neutral rubric that says nothing about length, so a terse skill gets no thumb on the scale. The figures below are the committed results (Claude Opus 4.8, 3 runs each) — run cd bench && npm run bench to reproduce.

A single blended number hides the story, because the levers fire differently per task type. Quality is % of baseline (panel median; for handoffs, lossless recovery); tokens are generated output vs baseline:

Task tier	Caveman	Ponytail	Honey
Code (14 unit-tested tasks)	101% · −37%	99% · +24%	98% · −49%
User-facing (7 landing/UI tasks)	99% · −18%	95% · −33%	101% · −6%
Agent-to-agent (2 handoff tasks, lossless recovery)	67% · −23%	50% · −22%	100% · −51%

Honey leads quality where it matters most — it tops the user-facing and agent-to-agent tiers (the quality-separating ones) and stays within judge noise of the pack on saturated code tasks — while cutting tokens where it's safe to:

Code — the deepest cut (−49% output) at essentially tied quality (98% vs 100%, within judge noise on tasks every variant passes). Caveman saves less; Ponytail's mandatory self-check inflates trivial code (+24%).
User-facing — the carve-out keeps Honey from compressing polish, yet it still trims output (−6%) while earning the top quality score (101% of baseline) and the only 100% accessibility pass; Ponytail strips hardest and drops to 81% on the structural/a11y checklist.
Agent-to-agent — under adversarial relay queries (ordinal, nested, absence, cross-field count) Honey is the only variant that stays 100% lossless while roughly halving handoff size (−51%); Caveman and Ponytail compress harder and lose recovery (67% / 50%). Its biggest, cleanest win.

The same pattern holds on GPT-5.5 (full two-provider table in bench/results/cross-provider.md): Honey is the only variant with no test regressions across all three tiers on Opus, and on both models it keeps top-tier quality while cutting tokens on every tier.

End-to-end agentic measurement (Cline harness)

npm run bench makes one API call per task — clean for isolating the output lever, but it never exercises an agent loop, tool schemas, or multi-turn context growth, where a real agent's token bill actually lives. bench/src/cline-bench.js (npm run bench:cline) runs each task through the Cline CLI headless, so the measured tokens are end-to-end agentic — harness prompt and every loop iteration included. Honey is injected as a Cline rule, recommended as the per-turn-cheap skills/honey/cline-rule.md (the operational core; the full SKILL.md re-sent every turn inflates input). See bench/README.md.

ESON — Efficient Structured Object Notation

Honey includes ESON, a zero-dependency, schema-first format for agent handoffs. Repeated record keys are emitted once; declared row counts catch truncated messages; JSON-compatible cells preserve types. ESON is developed in its own repo — Green-PT/honey-eson: the normative spec, JS + Python reference implementations, conformance vectors, the canonical LLM primer, the Honey Wire Profile, and negotiation. Honey vendors the codec in eso/.

The reproducible ESON/TOON/JSON benchmark measures bytes, two tokenizer estimates, codec speed, and lossless recovery across five agent handoff shapes. Run it with npm run bench:eso.

printf '%s' '{"from":"reviewer","findings":[{"sev":"H","issue":"expired token"}]}' | eson encode
eson decode < handoff.eson

CCR — for huge, redundant array tool output

ESON is lossless, for handoffs where every row matters. CCR (Compress-Cache-Retrieve) is the lossy-but-recoverable lever for the opposite case: a long uniform array you must read but mostly skim — logs, scan results, event streams. It keeps an informative sample (endpoints, anomalies/change-points, head/tail), caches the dropped rows locally, and leaves a <<ccr:HASH N_rows_offloaded>> sentinel. Nothing is lost — retrieve restores the original by hash on demand.

some-tool | eson crush          # → sampled view + sentinel; originals cached in .honey-ccr/
eson retrieve <hash>            # → the full original array, verbatim

Validated on a 90-row log (opus-4.8 + gpt-5.5): −82% tokens, crushed-only 96% answer accuracy, 100% with retrieve — and the lone crushed miss was a refusal, not a hallucination. Benches: npm run bench:ccr (tokens) and npm run bench:ccr:comprehension (quality). The honey-ccr skill tells the agent when to reach for it.

Known limitation (upstream): Claude Code builds affected by anthropics/claude-code#68951 (a regression present since ~2.1.121, still open) ignore a PostToolUse hook's updatedToolOutput for the built-in Bash tool. On those versions the entry-time hook runs and stashes the original, but the model still receives the raw uncompressed output — honey warns once at session start when it detects an affected version. Piping explicitly (some-tool | eson crush) is unaffected: compression happens before the output leaves the tool. Separately, the hooks need Node >= 14 on the PATH Claude Code spawns them with — desktop-app sessions inherit the launchd PATH, not your shell profile, so a stale /usr/local/bin/node is common; the hook now warns instead of failing silently.

PX — image-rendered reads for huge dense read-only bulk

The intuition: sending a file as text pays per character; sending an image pays per pixel, no matter how much text is crammed into it. So a "photo of the page" costs ~5× less than the page itself — and reading it has photo problems: the gist survives, an exact serial number might not.

Concretely: dense text packs ~3 chars per image-token vs ~1 as text. PX exploits the gap on the read path: when the agent must skim something huge it will never edit (vendored code, a large diff, docs), it renders it to PNG pages with pxpipe's export and Reads the images instead of the text.

npx pxpipe-proxy export --json --out "$TMPDIR" src/   # → page-*.png + factsheet.txt + token report

Measured: up to −85% tokens on a single read. Repo-corpus bench (npm run bench:px, results): −79…85%, −82% average (26.4k Claude text tokens → 4.8k image est.); ~−75% all-in per read after the factsheet + report overhead; pxpipe's own end-to-end proxy bill measures −59…70% at whole-workload level.

Comprehension is a Fable story. The live 4-model panel (node bench/px/comprehension.mjs — 10 byte-exact questions, text vs render):

model	text	from render
Claude Fable 5	10/10	7/10
Claude Opus 4.8	10/10	4/10
Claude Sonnet 4.6	10/10	4/10
Claude Haiku 4.5	10/10	1/10

Only Fable-class models read renders usably — and even Fable is not byte-safe. Lossy on exact strings — misreads are silent confabulations (Haiku answered a seed question with 0x9e3779b9, a constant that isn't in the file), so the export ships verbatim precision tokens (paths, SHAs, numbers) as factsheet.txt text, and the honey-px skill forbids it for files you'll edit, secrets, or non-Fable readers. Over the raw API, prepend the export's prompt.txt banner — Fable's safety layer refuses naked dense renders. Complementary to CCR: CCR drops redundant rows recoverably; PX keeps everything in view at pixel prices. At /honey ultra the core skill reaches for PX automatically on qualifying reads (big, dense, read-only); at other intensities it stays on-demand via honey-px. For the full wire-level version (system prompt, tool docs, history), run the pxpipe proxy itself — Honey and pxpipe stack.

Pick Honey when you want the best quality-per-token, especially in Claude Code.

Input precompression — a measured negative result

The three levers above cut output. There's symmetric waste on the input side — filler, pleasantries, and repeated sentences in the prompt itself. hooks/precompress.js is a deterministic, no-model compressor that strips them before the prompt reaches the LLM, protecting code, paths, URLs, double-quoted strings, and numbers verbatim (it never touches a token you'd need exact).

printf '%s' 'Hi! Could you please write a function `add(a, b)` that returns their sum? Thanks so much in advance!' | node hooks/precompress-cli.js
# -> write a function `add(a, b)` that returns their sum? in advance!

It's safe and lossless (35/35 property checks; on 10 unit-tested tasks the model's output passes 100%→100% from full vs compressed prompts), and on chatty prompts it cuts a lot — −16.5% median on a hand-written verbose corpus.

But that corpus flatters it. Measured on 266 real human-typed prompts from 35 actual sessions (bench/input/RESULTS.md), the cut is 2.5% total, median 0% — 219 of 266 prompts compress to nothing, because real prompts are already terse and carry almost no filler. Deterministic no-model compression can't catch reworded restatement (that needs a model), so this is the real ceiling, not a tuning problem.

The honest conclusion: the prompt is the wrong target. Real input volume in agentic coding is tool output (CCR's domain) and re-pasted context across turns — not human pleasantries. This ships as a CLI filter for the chatty-prompt case; it is not wired always-on, because on real traffic it would save ~nothing. Kept here as a measured negative result, in the repo's spirit of not overstating. Reproduce: node bench/input/tokens.mjs.

Skills & subagents

Honey is one always-on core plus a family of on-demand tools. The core is a writing style (it must be the default to pay off); the rest are actions you reach for at a specific moment.

Name	Kind	What it does
`honey`	core skill (always-on)	the three levers, applied reflexively to every response — plus loop cost discipline for recurring `/loop` runs. `/honey [lite\|full\|ultra\|off]`
`honey-chat`	standalone prompt	Honey for plain Claude — the terse-prose core, no tools required. Paste `skills/honey-chat/SKILL.md` into a claude.ai Project's custom instructions, a Style, or an API system prompt (~500 tokens)
`honey-design`	satellite skill	for user-facing UI (landing pages, components): keeps the full rendered polish, cuts tokens by writing the design densely (CSS vars, shared classes, `clamp()`) — same pixels, fewer tokens
`honey-review`	satellite skill	review a diff for over-engineering + over-verbosity; terse delete-list
`honey-eco`	satellite skill	this session's CO₂ / $ / tokens saved, from the committed EcoLogits port
`honey-gain`	satellite skill	the committed benchmark scoreboard (reads `bench/results/` at runtime)
`honey-compress`	satellite skill	rewrite a re-read memory file (CLAUDE.md, AGENTS.md) tersely to cut input tokens; backs up the original
`honey-memory`	satellite skill	create + maintain one committed per-project `PROJECT.md` so agents stop re-discovering the same facts every cold session; stores only stable, not-in-the-code context, kept honest by living in git
`honey-ccr`	satellite skill	crush huge redundant array tool output (logs, scan results) to a sampled view; lossy-but-recoverable via `eson crush`/`retrieve`
`honey-px`	satellite skill	read huge dense read-only bulk as rendered PNG pages (`npx pxpipe-proxy export`) — image tokens scale with pixels, not chars: up to −85% on token-dense content (Fable-class readers only); lossy on exact strings, never for files you'll edit
`honey-loop`	satellite skill	cost discipline for recurring `/loop` runs: cache-aware pacing (skip the 300s dead zone), event-driven-over-polling, no-change short-circuit, compact state handle, stop condition
`honey-superpowers`	satellite skill	stack Honey onto Superpowers-style subagent workflows: the Honey directive to inject into each dispatch prompt (worker + reviewer variants). On Claude Code the plugin's `SubagentStart` hook injects it automatically
`honey-hive`	guide skill	decide when to delegate to the hive vs. work inline
`hive-scout`	subagent (haiku, read-only)	locate symbols / callers / configs; returns a compact id-keyed JSON map
`hive-reviewer`	subagent (haiku, read-only)	review a diff/files; returns columnar id-keyed JSON findings
`hive-builder`	subagent (sonnet, ≤2 files)	make a surgical edit under the ladder; returns a compact change-manifest

The hive is Lever 3 with a runtime: each subagent returns a compressed handoff, so the result injected back into the orchestrator's context is −44–53% smaller with zero loss (npm run bench:hive). Live, the skills hold up too — honey −86%, honey-review −70%, hive-reviewer −43% output tokens at passing correctness (npm run bench:skills). See bench/hive/RESULTS.md and bench/skills/RESULTS.md.

On user-facing work — where the core skill spends tokens because polish is the spec — honey-design keeps the same rendered polish for −19% output tokens vs no skill (judge 92 vs 90), beating the core skill on both axes across 7 landing-page/UI tasks. See bench/results/honey-design.md.

Honesty note. Earlier versions of this README quoted 92% / 78% / 73% quality and −57% / −65% / −70% tokens from an unpublished run. Those don't reproduce — the real quality spread is far narrower and the token savings are tier-dependent (and Ponytail adds tokens on simple code). The table above is what the committed bench/ harness actually produces; see bench/results/combined.md for the full breakdown.

Install

Claude Code (plugin marketplace)

/plugin marketplace add Green-PT/honey-for-devs
/plugin install honey@greenpt

Then /honey once to turn it on (/honey lite|full|ultra to set intensity, /honey off to stop). The state persists across sessions — a SessionStart hook re-activates it every session until you run /honey off. A 🍯 badge shows the active mode in your statusline. If your client autocompletes /honey to honey:honey, that's the same command.

Plain Claude (claude.ai / API) — no install

The chat edition, skills/honey-chat/SKILL.md (~500 tokens), is the terse-prose core with the agent-harness levers removed — nothing in it needs tools. Two ways to use it:

Project custom instructions or a Style (recommended): paste the file in. Instructions become part of the system prompt, so Honey applies to every message in every conversation — always on, no triggering needed. The prefix is prompt-cached, and the ~500 input tokens are repaid many times over by the halved output.
Uploaded Skill (paid plans): zip the honey-chat/ folder and upload it as a Skill. Cheaper at rest (only the description stays in context) but loads only when Claude judges it relevant — for an always-on writing style, Project instructions are the better default.

On the API, use the file as (part of) your system prompt. Pin intensity by appending one line: Default to honey ultra or Default to honey lite.

One-line installer (interactive wizard)

In a terminal it asks which agents you use, whether to wire the CO₂ badge, drop per-repo rule files, and your default mode — then sets up exactly that. The wizard prompts on /dev/tty, so it works through curl | bash. CI/pipes and --yes fall back to auto-detect.

macOS / Linux / WSL / Git Bash:

curl -fsSL https://raw.githubusercontent.com/Green-PT/honey-for-devs/main/install.sh | bash

Windows (PowerShell 5.1+):

irm https://raw.githubusercontent.com/Green-PT/honey-for-devs/main/install.ps1 | iex

Windows (irm | iex) runs non-interactive; clone and run node bin/install.js for the wizard. Add bash -s -- --yes to skip prompts. Requires Node.js on your PATH. Safe to re-run; skips tools you don't have.

Every supported platform

Platform	Install
Claude Code	`/plugin marketplace add Green-PT/honey-for-devs` then `/plugin install honey@greenpt`
Codex	`codex plugin marketplace add Green-PT/honey-for-devs` then enable via `/plugins`
GitHub Copilot CLI	`copilot plugin marketplace add Green-PT/honey-for-devs` then `copilot plugin install honey@greenpt`
Gemini CLI	`gemini extensions install https://github.com/Green-PT/honey-for-devs`
OpenClaw	`clawhub install honey` (companions: `clawhub install honey-review`, …)
Cursor	copy `.cursor/rules/honey.mdc` into your project
Windsurf	copy `.windsurf/rules/honey.md` into your project
Cline	copy `.clinerules/honey.md` into your project (token-conscious: the compact `skills/honey/cline-rule.md`)
GitHub Copilot (editor)	copy `.github/copilot-instructions.md` into your project
Kiro	copy `.kiro/steering/honey.md` (project or `~/.kiro/steering/`)
OpenCode	copy `.opencode/AGENTS.md` into your project, then register it in `opencode.json` (`"instructions": [".opencode/AGENTS.md"]`) — or copy it to global `~/.config/opencode/AGENTS.md`. OpenCode does not auto-load a nested `.opencode/AGENTS.md`.
Kilo Code	copy `.kilo/rules/honey.md` into your project (auto-discovered; `.kilocode/rules/` also works)
Aider / Zed / any AGENTS.md reader	copy `AGENTS.md` into your project

All of these are also handled automatically by the one-line installer. See INSTALL.md for manual steps, flags, and uninstall.

Carbon badge (Claude Code)

When Honey is active, the statusline also shows a live CO₂ estimate for the session and the CO₂/$ saved vs a no-Honey baseline:

🍯 honey:full · 🌿 44g CO₂ (saved ~26g · $0.18)

(Illustrative — a ~2k-output-token Opus session.) The estimate is a faithful port of EcoLogits v0.8.2 (verified to match the package exactly). Model params come from EcoLogits' own registry (hooks/eco-models.json, exported by scripts/build-eco-models.py) — matched by exact id, falling back to a per-family alias for frontier models too new for the registry. Grid switches per provider — Anthropic on AWS Trainium (~500 gCO₂/kWh), OpenAI on Azure (~400), Google on GCP (~330). Aliases, grids, and per-mode savings live in hooks/eco-config.json.

The badge itself renders only in Claude Code (it reads Claude Code's transcript, where every model is a Claude model). The provider switching matters for scripts/eco_report.py, which runs against any transcript — Codex/Gemini CLIs would each need their own statusline hook to show a live badge there.

Params are speculative — Anthropic discloses none. EcoLogits' raw coefficient is a single-stream (batch-size-1) upper bound — it gives one request the whole GPU set for the full generation (for Opus, ~1.9 tok/s, ~30× slower than reality), which alone is ~1.4 kg per 1M output tokens. Production serves many requests concurrently, so the badge divides that ceiling by an effective batch concurrency (serving_concurrency, default 32 — calibrated so modeled throughput matches real ~50–70 tok/s serving) to show realistic served impact. eco_report.py prints both the served figure and the single-stream ceiling. Treat these as a range, not a meter reading.

For the full breakdown (usage + embodied + primary energy) run the real package:

pip install ecologits
python scripts/eco_report.py        # newest session, or --transcript PATH

How it stays in sync

The skill is authored once in skills/honey/SKILL.md. Every per-platform rule file (and AGENTS.md) is generated from it:

node scripts/build-rules.js          # regenerate all rule files
node scripts/build-rules.js --check  # CI: fail if any copy drifted

The OpenClaw skill package (.openclaw/skills/) is generated the same way from skills/; rerun node scripts/build-openclaw-skills.js after changing a skill. tests/openclaw-skills.test.js fails if a committed copy is stale.

License

MIT — see LICENSE.

The carbon-estimation data and coefficients in hooks/eco-models.json and hooks/eco.js are derived from EcoLogits and remain under the MPL-2.0. See NOTICE for details.

Honey For Devs

README