fable

fable is a skill for Claude Code, Codex from LeoLin990405/r-analytics-skill. It costs 22 tokens per session (497 once invoked), scanned A, original, MIT.

An R guide for tidy time-series forecasting, where observations are organized by dates and optional groups such as products or locations.

In plain words
What is it for?
Use it to prepare date-indexed data, fit ARIMA, exponential-smoothing, naive, regression, and Prophet models, forecast future periods, decompose series, and run cross-validation.
Why use it?
It helps you fit several forecasting methods across one or many series and check how accurate their predictions are.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to prepare date-indexed data, fit ARIMA, exponential-smoothing, naive, regression, and Prophet models, forecast future periods, decompose series, and run cross-validation.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/leolin990405/r-analytics-skill/fable
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 LeoLin990405/r-analytics-skill --skill fable
Clone the repo
git clone --depth 1 https://github.com/LeoLin990405/r-analytics-skill

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

README.md
[![agentmods](https://agentmods.dev/badge/skills/leolin990405/r-analytics-skill/fable/github.svg)](https://agentmods.dev/skills/leolin990405/r-analytics-skill/fable)
Your own site
<a href="https://agentmods.dev/skills/leolin990405/r-analytics-skill/fable"><img src="https://agentmods.dev/badge/skills/leolin990405/r-analytics-skill/fable/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

Your own site · 80×15
<a href="https://agentmods.dev/skills/leolin990405/r-analytics-skill/fable"><img src="https://agentmods.dev/badge/skills/leolin990405/r-analytics-skill/fable.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 22 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 497 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 $0.00022 $0.00497
Opus 5 $0.00011 $0.00249
Sonnet 5 $0.00004 $0.00099
Haiku 4.5 $0.00002 $0.00050

Measured 9d ago against content hash ca4ed8c96c18, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

fable 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 9d ago.

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.

sub-skills/r-ml/r-ml-timeseries/fable/SKILL.md · 109 lines

What it actually says

fable Package

Tidy time series forecasting.

Setup

library(fable)
library(tsibble)
library(feasts)

# Create tsibble
ts_data <- df %>%
  as_tsibble(index = date, key = id)

Basic Forecasting

# Fit models
fit <- ts_data %>%
  model(
    arima = ARIMA(value),
    ets = ETS(value),
    naive = NAIVE(value)
  )

# Forecast
fc <- fit %>% forecast(h = 12)

# Plot
fc %>% autoplot(ts_data)

Model Specifications

# ARIMA
ARIMA(value)
ARIMA(value ~ pdq(1,1,1) + PDQ(1,1,1))

# ETS
ETS(value)
ETS(value ~ error("A") + trend("A") + season("M"))

# TSLM (regression)
TSLM(value ~ trend() + season())

# Prophet
prophet(value ~ season(period = "year", order = 10))

Multiple Series

# Fit by group
fit <- ts_data %>%
  model(arima = ARIMA(value))

# Forecast all
fc <- fit %>% forecast(h = 12)

# Accuracy by group
accuracy(fit)

Decomposition

ts_data %>%
  model(STL(value ~ season(window = "periodic"))) %>%
  components() %>%
  autoplot()

Cross-Validation

# Stretch tsibble
cv_data <- ts_data %>%
  stretch_tsibble(.init = 100, .step = 1)

# Fit and forecast
cv_fc <- cv_data %>%
  model(ARIMA(value)) %>%
  forecast(h = 1)

# Accuracy
cv_fc %>% accuracy(ts_data)

Reconciliation

# Hierarchical forecasting
fit <- ts_data %>%
  aggregate_key(region / store, value = sum(value)) %>%
  model(ets = ETS(value))

fc <- fit %>%
  reconcile(ets = min_trace(ets)) %>%
  forecast(h = 12)
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. 9d ago First seen · 109 lines · 22 tokens per session scan A ca4ed8c96c18

Subscribe to this mod's changes

fable is a skill published in the GitHub repository LeoLin990405/r-analytics-skill (5 stars, last pushed 6mo ago), licensed MIT. It adds 22 tokens to every session and 497 once invoked, about $0.0001 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 2026-09-03.

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