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fable-low-power

fable-low-power is a skill for Claude Code, Codex from ussumant/useful-agent-skills. It costs 108 tokens per session (1,287 once invoked), scanned A, original, MIT.

A low-power operating mode for Anthropic usage limits, where the most capable model makes decisions and coordinates work while cheaper models perform execution steps.

In plain words
What is it for?
Use it automatically or manually when usage limits are tight, while keeping a frontier model responsible for decisions, review, and orchestration.
Why use it?
It reduces use of limited high-cost model capacity when short-term or weekly usage is running low.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: reads .claude/ paths; mentions subagents; mentions Claude Code.

not rated 4repo 17d ago A scan 108 tokens original MIT

Good fit Use it automatically or manually when usage limits are tight, while keeping a frontier model responsible for decisions, review, and orchestration.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ussumant/useful-agent-skills/fable-low-power
View source ↗ ussumant/useful-agent-skills
Install

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.

Any agent
npx skills add ussumant/useful-agent-skills --skill fable-low-power
Clone the repo
git clone --depth 1 https://github.com/ussumant/useful-agent-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for fable-low-power

README.md
[![agentmods](https://agentmods.dev/badge/skills/ussumant/useful-agent-skills/fable-low-power/github.svg)](https://agentmods.dev/skills/ussumant/useful-agent-skills/fable-low-power)
Your own site
<a href="https://agentmods.dev/skills/ussumant/useful-agent-skills/fable-low-power"><img src="https://agentmods.dev/badge/skills/ussumant/useful-agent-skills/fable-low-power/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for fable-low-power

Your own site · 80×15
<a href="https://agentmods.dev/skills/ussumant/useful-agent-skills/fable-low-power"><img src="https://agentmods.dev/badge/skills/ussumant/useful-agent-skills/fable-low-power.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 108 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,287 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00108 $0.01287
Opus 5.5 $0.00043 $0.00515
Sonnet 5.5 $0.00022 $0.00257
Haiku 4.5 $0.00011 $0.00129

Measured 2mo ago against content hash 938e38ca949d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fable-low-power 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 2mo ago.

The scan reads SKILL.md. This mod also ships 3 executable files (limit-sense.sh, low-power-mode.sh, statusline-tee.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/fable-low-power/SKILL.md · 95 lines

How it starts

The opening of the file, as written. The whole thing — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Fable Low Power Mode

A power profile, not a new orchestrator. This skill defines what CHANGES when your Anthropic usage limits run low, and how the mode switches.

State machine

State file: ~/.claude/fable-low-power.json · Sensor: ~/.claude/skills/fable-low-power/limit-sense.sh

  • Signal: rate_limits.five_hour/.seven_day.used_percentage from the statusline payload Claude Code pipes per render tick, teed to ~/.claude/cache/statusline-payload.json by statusline-tee.sh. No credentials involved. If you replace the statusline script, keep the tee.
  • Modes: auto (default — thresholds decide) · on / off (manual, outranks auto).
  • Auto thresholds (in the state file): ON when 5h ≥ 60% or 7d ≥ 75%; back OFF only when 5h < 40% and 7d < 65% (hysteresis, no flapping). Reading stale >30 min → hold last state.
  • Trigger: low-power-mode.sh announces ON at session start and mid-session flips at prompt boundaries. Announcements instruct the session to invoke this skill.

Subcommands (when invoked as /fable-low-power …)

Args Do
(none) / status bash ~/.claude/skills/fable-low-power/limit-sense.sh → report effective state, mode, 5h/7d %, resets, thresholds, and frontier burn (fable_today / fable_7d / workers_today) — one screen.
on bash ~/.claude/skills/fable-low-power/limit-sense.sh set-mode on → confirm, then APPLY the profile below immediately in this session.
off bash ~/.claude/skills/fable-low-power/limit-sense.sh set-mode off → confirm normal routing resumed.
auto bash ~/.claude/skills/fable-low-power/limit-sense.sh set-mode auto → report what auto currently decides.

Usage tracking

The statusline tee also writes a per-session ledger: ~/.claude/cache/usage-sessions/<session_id>.json — cumulative model, cost, and main-loop token totals, atomically overwritten per tick (last write = session totals). limit-sense.sh aggregates it into:

  • fable_today — sessions whose main loop matches model_match (default "fable", editable in the state file), active today: count, cost_usd, in/out tokens. out_tokens is the main loop only, so it's the closest proxy for "what the frontier model itself generated"; cost_usd includes in-session subagents.
  • fable_7d — same over the trailing 7 days (matches the weekly limit window).
  • workers_today — interactive sessions on other models. Headless -p runs never tick a statusline, so they don't appear.

Read the full file on GitHub · 95 lines

Files

What ships with it

12 files 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.

Changes

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.

  1. 2mo ago First seen · 95 lines · 108 tokens per session scan A 938e38ca949d

Subscribe to this mod's changes

fable-low-power is a skill published in the GitHub repository ussumant/useful-agent-skills (4 stars, last pushed 17d ago), licensed MIT. It adds 108 tokens to every session and 1,287 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-08-31.

Claude Codeagent-skillsclaudeclaude-skillsskills
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