evidence-driven-work

evidence-driven-work is a skill for Claude Code from josix/agent-flow. It costs 153 tokens per session (2,287 once invoked), scanned C, original, MIT.

A set of working practices for basing investigations on what the system actually did and explaining the findings clearly.

In plain words
What is it for?
Use it to choose useful measurements, identify tools or views that can provide evidence, request needed access, and report findings.
Why use it?
It helps avoid guesses when diagnosing slow behavior, failures, ignored settings, or disproved assumptions.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions subagents.

Part of the agent-flow plugin — 12 skills, 5 commands, 6 agents, 7 hooks shipped together

Good fit Use it to choose useful measurements, identify tools or views that can provide evidence, request needed access, and report findings.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/josix/agent-flow/evidence-driven-work
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 josix/agent-flow --skill evidence-driven-work
Clone the repo
git clone --depth 1 https://github.com/josix/agent-flow

Made for: Claude Code.

Or install agent-flow, the plugin that ships this one along with the rest of its 12 skills, 5 commands, 6 agents, 7 hooks.

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 evidence-driven-work

README.md
[![agentmods](https://agentmods.dev/badge/skills/josix/agent-flow/evidence-driven-work/github.svg)](https://agentmods.dev/skills/josix/agent-flow/evidence-driven-work)
Your own site
<a href="https://agentmods.dev/skills/josix/agent-flow/evidence-driven-work"><img src="https://agentmods.dev/badge/skills/josix/agent-flow/evidence-driven-work/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 evidence-driven-work

Your own site · 80×15
<a href="https://agentmods.dev/skills/josix/agent-flow/evidence-driven-work"><img src="https://agentmods.dev/badge/skills/josix/agent-flow/evidence-driven-work.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 153 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,287 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. 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 $0.00153 $0.02287
Opus 5.5 $0.00061 $0.00915
Sonnet 5.5 $0.00031 $0.00457
Haiku 4.5 $0.00015 $0.00229

Measured yesterday against content hash fa297cf5b4ef, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

evidence-driven-work scanned grade C with 1 finding 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 yesterday.

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.

Harvests environment variableshighData exfiltration

Enumerating or grepping the environment for keys collects credentials unrelated to what the mod says it does.

- Without access: name the equivalent surface, say what it would answer, and ask the user for access or give them the exact command (in a subagent, put this in your report instead). Do not work around a block or extract
skills/evidence-driven-work/SKILL.md · 138 lines

How it starts

The opening of the file, as written. The whole thing — 138 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Evidence-Driven Work

Base claims on what the system actually did, and communicate them so a reader understands at a glance.

Overview

These practices apply to whoever does the work, in a plain session or in any persona. They sit one level above specific tools: the tools change per domain, the habits do not.

  • Inside /orchestrate, the orchestrator's Phase 6 report follows the reporting shape in sections 7 and 8; the Intent Ledger and the <orchestration-complete> promise stay required. That report goes to the user inline: the ~3000-character report-length rule is for subagent reports, not this one. As orchestrator, hand investigation and verification to the specialists in the Delegation Decision Matrix.
  • Commit and PR footers: follow the user's or project's stated rule; this skill sets none.
  • Boundaries: code search is exploration-strategy; gates, the Intent Ledger and environment-blocked triage are verification-gates; irreversible actions and permission blocks are agent-behavior-constraints; precedent is agentsview-usage.

Running as a subagent

Lawliet and Alphonse preload this skill, but they report to the orchestrator, not the user, and their output is parsed. So in a subagent:

  • Your role's output format wins. Verdict lines (### Verdict, ### Overall:), gate lines and file:line findings keep their exact form and position (your agent definition puts ### Verdict / ### Overall: last); sections 7 and 8 shape only the prose around them. "Outcome first" doesn't apply to you: your verdict line carries the outcome, so don't move it up or add a headline restating it.
  • Blockers go in your report, not to the user. Wherever this skill says to ask the user, confirm a reading, or hand them a command, return it the way your role's contract says instead: ENVIRONMENT_BLOCKED or FAILED with the exact error signature for Alphonse, a finding or a note in the summary for Lawliet. The orchestrator decides whether to ask the user.
  • Do your own role's checks. Delegating to specialists is the orchestrator's job; you have no Agent tool, so the Delegation Decision Matrix doesn't apply to you.
  • Skip what your role can't act on: change discipline (section 3) and the external-write protocol (section 8) are for whoever makes and ships the change.

Read the full file on GitHub · 138 lines

Files

What ships with it

5 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. yesterday First seen · 138 lines · 153 tokens per session scan C fa297cf5b4ef

Subscribe to this mod's changes

evidence-driven-work is a skill published in the GitHub repository josix/agent-flow (8 stars, last pushed today), licensed MIT. It adds 153 tokens to every session and 2,287 once invoked, about $0.0006 per session on Opus 5.5. A static security scan graded it C with 1 finding (harvests environment variables). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-25.