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prompt-fixer

prompt-fixer is a skill for Claude Code, Codex from duncan-buildroom/freeskills. It costs 133 tokens per session (1,713 once invoked), scanned B, original, no licence file.

A prompt-improvement guide that explains why a prompt produced poor results and rewrites it. A prompt is the instruction you give to an AI system.

In plain words
What is it for?
Use it to fix prompts that are too vague, combine several requests, lack a clear completion condition, or ask for code instead of a desired result.
Why use it?
It removes the need to guess why an AI response went wrong. It checks for common issues such as missing context, unclear requests, and absent constraints or output format.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

not rated 63repo +2 23d ago B scan 133 tokens no licence

Good fit Use it to fix prompts that are too vague, combine several requests, lack a clear completion condition, or ask for code instead of a desired result.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/duncan-buildroom/freeskills/prompt-fixer
View source ↗ duncan-buildroom/freeskills
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 duncan-buildroom/freeskills --skill prompt-fixer
Clone the repo
git clone --depth 1 https://github.com/duncan-buildroom/freeskills

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 prompt-fixer

README.md
[![agentmods](https://agentmods.dev/badge/skills/duncan-buildroom/freeskills/prompt-fixer/github.svg)](https://agentmods.dev/skills/duncan-buildroom/freeskills/prompt-fixer)
Your own site
<a href="https://agentmods.dev/skills/duncan-buildroom/freeskills/prompt-fixer"><img src="https://agentmods.dev/badge/skills/duncan-buildroom/freeskills/prompt-fixer/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 prompt-fixer

Your own site · 80×15
<a href="https://agentmods.dev/skills/duncan-buildroom/freeskills/prompt-fixer"><img src="https://agentmods.dev/badge/skills/duncan-buildroom/freeskills/prompt-fixer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 133 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,713 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown 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 $0.00133 $0.01713
Opus 5.5 $0.00053 $0.00685
Sonnet 5.5 $0.00027 $0.00343
Haiku 4.5 $0.00013 $0.00171

Measured 2mo ago against content hash 5685297dde06, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

prompt-fixer scanned grade B 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 2mo 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.

Strips warnings and disclaimersmediumAnti-refusal

Omitting safety caveats hides risk from the user and is a common jailbreak preamble.

List the secondary causes as short bullets underneath. Don't lecture on all seven.
prompt-fixer/SKILL.md · 102 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 2mo ago First seen · 102 lines · 133 tokens per session scan B 5685297dde06

Subscribe to this mod's changes

prompt-fixer is a skill published in the GitHub repository duncan-buildroom/freeskills (63 stars, last pushed 23d ago), with no licence file. It adds 133 tokens to every session and 1,713 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it B with 1 finding (strips warnings and disclaimers). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Data and AIPrompting
Related

prompt-fixer compared with skills from other repositories

prompt-fixer next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
prompt-fixerduncan-buildroom/freeskillsSkill6323d agononeB133Claude Code, Codex
llm-app-patternsdavila7/claude-code-templatesSkill33kyesterdayMITA54Claude Code, Codex
prompt-engineerJeffallan/claude-skillsSkill12k7d agoMITA93Claude Code
prompt-optimizationlangwatch/langwatchSkill5.0kyesterdayApache-2.0A105Claude Code, Codex
omh-model-optimizationrlaope/oh-my-hermesSkill5.2kyesterdayMITA84Claude Code, Codex
ideogram4digitalsamba/claude-code-video-toolkitSkill2.5kyesterdayMITA99Claude Code
prompt-library-for-startupsaws/agent-toolkit-for-awsSkill3.4kyesterdayApache-2.0A228Claude Code