work-data-analysis

A guide for turning tabular, experimental, operational, or business data into repeatable findings for a specific decision. It covers defining the population and measures, checking data quality, and documenting transformations.

In plain words
What is it for?
Use it to investigate trends, segments, experiments, forecasts, reconciliations, unusual values, key performance indicators, and data-quality problems.
Why use it?
It helps prevent misleading conclusions caused by unclear metrics, bad joins, duplicate rows, missing values, inconsistent units, or hidden exclusions. Each result can be traced back to its source data and processing choices.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/evoelsewhere/evoflux/work-data-analysis
Any agent
npx skills add evoelsewhere/evoflux --skill work-data-analysis
Clone the repo
git clone --depth 1 https://github.com/evoelsewhere/evoflux

Made for: Claude Code, Codex.

Per session 73 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 535 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00073 $0.00535
Opus 5 $0.00036 $0.00267
Sonnet 5 $0.00015 $0.00107
Haiku 4.5 $0.00007 $0.00053

Measured 2d ago against content hash f301590676ab, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

work-data-analysis 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 2d 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.

app/agent/builtin_skills/work-data-analysis/SKILL.md · 60 lines

How it starts

The opening of the file, as written. The whole thing — 60 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Analyze work data

Anchor analysis to a decision and make every material transformation reproducible. A polished chart cannot rescue an undefined population or broken join. Do not load bundled references when this skill activates.

Frame the analysis

  1. Define the decision, audience, population, unit of analysis, time window, comparison, metrics, and required deliverable.
  2. Distinguish metric definitions supplied by the user from definitions you infer. Surface decisions about cohort, attribution, time zone, currency, units, denominator, and exclusions.
  3. Record data provenance and freshness before calculating.

Audit before interpreting

Inspect schema, types, keys, cardinality, duplicates, missingness, coverage, units, time zones, impossible values, and join behavior. Reconcile headline counts or totals to a trusted baseline when one exists.

Read references/data-quality-gates.md only when joining sources, excluding rows, treating outliers, analyzing experiments, forecasting, or resolving a mismatch with a reported metric.

Never silently coerce invalid values, drop duplicates, discard outliers, impute missing fields, or switch denominators. Preserve a compact audit trail of each consequential transformation.

Analyze proportionately

Start with counts, distributions, and denominators. Segment only where it can change the decision. Quantify uncertainty and test alternative reasonable definitions that could reverse the conclusion.

For experiments, check assignment, sample ratio, exposure, pre-period balance, multiple comparisons, and practical—not only statistical—significance. For forecasts, separate observed inputs, model assumptions, scenarios, and error range. Do not imply causation from observational correlation.

Produce the artifact

Create the smallest table or visualization that makes the decision-relevant relationship clear. Keep calculations reproducible in formulas, queries, or code and preserve source data unless transformation is explicitly requested. Protect row-level personal or confidential data in outputs.

Read the full file on GitHub · 60 lines

Files

What ships with it

3 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. 2d ago First seen · 60 lines · 73 tokens per session scan A f301590676ab

Subscribe to this mod's changes

work-data-analysis is a skill published in the GitHub repository evoelsewhere/evoflux (5 stars, last pushed 6d ago), licensed Apache-2.0. It adds 73 tokens to every session and 535 once invoked, about $0.0004 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 2026-08-31.

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