BuyAI Skills17 listings

AI agent skills marketplace for Claude Code, Codex and the API.

Browse AI skills on Sigrix: portable SKILL.md capabilities an assistant or agent loads when it needs them. Built on the open agentskills.io spec, so the same file works across Claude, Codex, and the API.

Install the free skills in Claude Code

One command, no account, no token. You get every skill here that its seller publishes at no charge and keeps in the public feed — each one credits its seller and links back to their catalog.

/plugin marketplace add https://sigrix.io/mp/free.git
Featured AI skill

policy-grounding

Answers only from the shop's own documents (its policies, FAQ and product catalog), quotes the passage each claim relies on, and says plainly when the documents do not cover the question. Use whenever a reply depends on what the shop allows or on a fact about a product.

Research & Analysis 72 tokens
View skill by @fed
8 of 16
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skill

support-reply

Drafts a reply to a customer email in the shop's voice: acknowledge, answer, give the next step, sign off. Also decides when a person should answer instead, and what the customer is sent while they do. Use for every reply you draft to a customer.

@fed Free
skill

fair-hiring-workflow-small-teams

A practical, repeatable hiring workflow for founders and small teams without dedicated HR. Move from role scoping to a clear job description, structured interviews, consistent evidence-based scorecards, and a documented debrief. Includes prompts, templates, fairness checks, and guidance for keeping human judgment in control—without ranking candidates automatically or inferring protected traits.

@fed Free
skill

sigrix-mcp-setup-doctor

Help Sigrix sellers configure the Sigrix MCP in VS Code, Cursor, Claude Code, or Claude Desktop, verify connectivity, and diagnose authentication and startup failures. Use when the server is missing, seller tools return 401, or setup behaves differently across clients; protect tokens and distinguish public connectivity from authenticated seller access.

@fed Free
skill

sigrix-listing-workshop

Turn a rough idea, existing prompt, persona, or skill into a clear Sigrix listing. Use when planning, writing, refining, or validating marketplace listing content; preserve the author's intent, identify missing decisions, and avoid unsupported claims.

@fed Free
skill

ai-ops-setup

AI Ops setup for teams: audit workflows, implement practical AI-agent operations, and deliver a working playbook. Start at https://aiops.neocities.org/ ; payment: https://buy.stripe.com/fZubJ0827bzW8DV02hgUM00

@aiops Free
skill

stop-slop-writing

A practical writing skill for creators and teams who want clear, specific, human-sounding copy. It turns rough AI drafts into useful edits by removing hype, filler, generic slop, and hard-to-read phrasing while preserving the writer's intent and voice.

@jdoss Free
skill

layerback-image-to-vsdx

Convert screenshots, diagrams, flowcharts, architecture drawings, and other images into editable Microsoft Visio VSDX files with LayerBack. Built for engineers, analysts, researchers, and operations teams who need to recover shapes, text, connectors, and layout from flat images so the diagram can be revised instead of redrawn manually.

@dyl Free
skill

patentfig-ai-patent-drawing

Generate professional patent figures from invention descriptions with the official PatentFig AI workflow. Built for patent attorneys, agents, IP teams, inventors, and product teams that need clear technical drawings, consistent figure numbering, iterative revisions, and export-ready visuals while keeping the invention context organized.

@dyl Free
Category

Operations & Process

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skill

sigrix-listing-workshop

Turn a rough idea, existing prompt, persona, or skill into a clear Sigrix listing. Use when planning, writing, refining, or validating marketplace listing content; preserve the author's intent, identify missing decisions, and avoid unsupported claims.

@fed Free
skill

ai-ops-setup

AI Ops setup for teams: audit workflows, implement practical AI-agent operations, and deliver a working playbook. Start at https://aiops.neocities.org/ ; payment: https://buy.stripe.com/fZubJ0827bzW8DV02hgUM00

@aiops Free
skill

remove-ai-tells

Strip the structural and lexical patterns that mark text as AI-written, while preserving the author's meaning and any stylistic choices that are genuinely theirs. Targets the real tells — hedge stacking ("it's worth noting that," "it's important to remember"), the "not just X, it's Y" construction, tricolon abuse (three parallel phrases for everything), restating-the-intro conclusions, vague intensifiers ("truly," "deeply," "profoundly"), and overused vocabulary ("delve," "tapestry," "navigate t

@fed Free
skill

clean-pasted-text

Fix text that was pasted from a PDF, Word doc, webpage, email, or chat and arrived broken. Repairs smart quotes and curly apostrophes, removes non-breaking spaces and zero-width characters, fixes mid-word line breaks and hyphenation from PDF column wraps, normalizes bullets and dashes, collapses double spaces after periods, strips invisible Unicode trash, and rebuilds paragraph structure when newlines were lost or doubled. Use when the user says the text "looks weird," "won't format right," "has

@fed Free
Category

Engineering & Automation

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Category

Writing & Content

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Category

Design & Creative

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Category

Marketing & Growth

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Publish your own skill

Built a capability worth reusing? Publish it as a skill.

Package your SKILL.md and a worked example into a skill listing. List it free or paid — buyers get instant access and you keep the credit.

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About AI skills

What is an AI skill?

An AI skill is a reference document — a SKILL.md file — an assistant or agent loads into context to do a specific job. Skills do not run on their own; they are tools a model picks up when needed.

Sigrix skills follow the open agentskills.io specification, so the same file works in Claude Code, Codex CLI, claude.ai, and the Claude API — buy once, use everywhere.

Compare skills by the job they add, the platforms they have been tested on, and price — a good skill listing bundles the file plus a worked example so you see what 'good' looks like.

People searching for AI skills usually want a portable capability they can drop into an assistant or agent without rebuilding it from scratch. Popular searches: agent skills marketplace, ai skills marketplace, claude code skills, agent skills, skill.md, claude skills, ai agent capabilities. Related: ai assistants, ai agents, prompts, agentskills.io, tools.

What's inside an AI skill

01
A SKILL.md file
The skill is a reference document the model loads into context — instructions, procedures, and examples for one specific job.
02
Open, portable spec
Built on agentskills.io, so the same file works across Claude Code, Codex CLI, claude.ai, and the API without rewriting.
03
Loaded on demand
An assistant or agent picks the skill up only when it is relevant, so it adds capability without bloating every conversation.
04
Worked example included
Good skill listings bundle a sample run, so you can see the capability in action before you buy.

Skills vs prompts, assistants & agents

A skill is one of several AI building blocks on Sigrix. Here is how it differs from the others:

Prompt
A single instruction you send once. A skill is a reusable capability a model loads whenever the job comes up.
Persona
A kind of prompt that shapes how a model sounds. A skill adds what a model can do.
Assistant
A chat experience that loads skills when relevant — the skill is the tool, the assistant is the worker.
Agent
An autonomous tool that calls skills as it runs its steps.

Related guides

Frequently asked questions

More guides in Sigrix Learn, or read the full buyer & seller FAQ.

An AI skill is a reference document — a SKILL.md file — that an AI assistant or agent loads into context to do a specific job. It adds a capability the model can use on demand.

Yes. Sigrix skills follow the open agentskills.io specification, so the same file works in Claude Code, Codex CLI, claude.ai, and the Claude API.

A prompt is a single instruction you send once. A skill is a reusable capability the model loads whenever the relevant job comes up, without you re-pasting it.

Some skills are free to claim and others are paid — each skill's price is shown on its card and detail page. Either way you own an editable copy once you claim it.

Yes. Approved sellers can publish skills on Sigrix: upload the SKILL.md, add a worked example, set a price, and list it. See the Sell page to get started.