executing-hard-tasks

executing-hard-tasks is a skill for Claude Code, Codex from wsbm393/Fable-Skill. It costs 68 tokens per session (1,494 once invoked), scanned A, original, MIT.

A work method for handling tasks that span multiple steps, files, or uncertain details. It uses checks against observed results so the plan can change when new information appears.

In plain words
What is it for?
Use it to break down complex coding tasks, choose what to investigate first, verify progress, and reassess after failures or surprises.
Why use it?
It reduces the risk of building on wrong assumptions or claiming success without evidence. It also keeps work within a defined scope and budget.

Skill for Claude CodeCodex

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

Good fit Use it to break down complex coding tasks, choose what to investigate first, verify progress, and reassess after failures or surprises.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/wsbm393/fable-skill/fable-skill
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 wsbm393/Fable-Skill --skill fable-skill
Clone the repo
git clone --depth 1 https://github.com/wsbm393/Fable-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 executing-hard-tasks

README.md
[![agentmods](https://agentmods.dev/badge/skills/wsbm393/fable-skill/fable-skill/github.svg)](https://agentmods.dev/skills/wsbm393/fable-skill/fable-skill)
Your own site
<a href="https://agentmods.dev/skills/wsbm393/fable-skill/fable-skill"><img src="https://agentmods.dev/badge/skills/wsbm393/fable-skill/fable-skill/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 executing-hard-tasks

Your own site · 80×15
<a href="https://agentmods.dev/skills/wsbm393/fable-skill/fable-skill"><img src="https://agentmods.dev/badge/skills/wsbm393/fable-skill/fable-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 68 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,494 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 $0.00068 $0.01494
Opus 5.5 $0.00027 $0.00598
Sonnet 5.5 $0.00014 $0.00299
Haiku 4.5 $0.00007 $0.00149

Measured 1mo ago against content hash b6a15efcbe56, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

executing-hard-tasks 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 1mo 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.

SKILL.md · 70 lines

How it starts

The opening of the file, as written. The whole thing — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Executing Hard Tasks

Overview

Core principle: a plan is a hypothesis; a checkpoint is its test. Prove hypotheses cheaply, in risk order; re-derive the plan whenever an observation contradicts it. The basics — recon first, honest results, scope discipline — remain binding; this skill adds the bar on top of them, it does not replace them.

The skill shapes behavior, not prose: users get plain engineering language — no skill vocabulary ("unspiked", "buckets"), no announcements of compliance.

Decomposing

Contract for every plan:

  1. Done, as an observation the user would accept. "Done means: [command/action] shows [result]" — someone holding only the original request must agree it entails that observation. Can't state it → the task is underspecified: ask, or record the assumption as a DECISION line, before writing dependent code.
  2. State the budget, then thread it. Put the budget (wall-clock or steps) in the plan header. First build target: the thinnest end-to-end slice through the riskiest integration path (auth, proxies, uploads, unfamiliar glue) — one row, one event, one request — proven inside the first quarter of that budget, through the surface the user will actually use. Layer the rest onto the proven thread. Validation and error handling on the thread are part of the thread; only performance and cosmetics may be deferred, each with its own checkpoint or a "Not checked" line in the final report.
  3. Checkpoint every subtask, fixed at plan time. A checkpoint is a command whose output you will paste, or an externally observable result (HTTP response, rendered output, screenshot). Self-review of your own edits never qualifies. More than two subtasks without an executed checkpoint = an end-loaded plan, whatever its phases are called. Weakening or replacing a checkpoint after it fails is itself a red checkpoint — report it as a plan change.
  4. Spike before you build on a recommendation. Prove an architecture's critical integration point with the cheapest end-to-end experiment before implementing it as the chosen path — whether or not anyone is asked to approve it. An unproven option may be described, but the description must name exactly what is unproven and the rework cost if it fails.
  5. DECISION lines for load-bearing choices. A choice that changes what data exists or what users observe (skip vs update duplicates; suppress-at-write vs suppress-at-read) appears in the user-facing plan as "DECISION: X over Y because Z". If it destroys or transforms persisted data, it gates on the user like any irreversible action.

Read the full file on GitHub · 70 lines

Files

What ships with it

1 file 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. 1mo ago First seen · 70 lines · 68 tokens per session scan A b6a15efcbe56

Subscribe to this mod's changes

executing-hard-tasks is a skill published in the GitHub repository wsbm393/Fable-Skill (26 stars, last pushed 3mo ago), licensed MIT. It adds 68 tokens to every session and 1,494 once invoked, about $0.0003 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 2026-09-04.

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