AI agents — autonomous tools that get the job done.
The marketplace for AI agents: autonomous, multi-step tools that plan, use tools, and complete real work on their own. Compare AI agents by the job they automate, the model they were tested on, and price — then drop one into your workflow.
Build your own agent
Built an agent that gets real work done? Publish it.
Package your runbook, tools, and guardrails into an AI agent. List it free or paid — buyers get instant access and you keep the credit.
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About AI agents
What is an AI agent?
An AI agent is an autonomous tool: you give it a goal and it plans the steps, calls the tools it needs, and hands back a finished result — instead of working with you turn by turn the way an assistant does.
Every AI agent on Sigrix ships with a tested runbook, so you can see exactly what it does before you buy — the steps it runs, the model it was tested on, and its token cost per run.
Compare AI agents by the job they automate, the platforms and models they run on, how autonomous they are, and price — then plug the one you pick straight into your workflow.
People searching for an AI agent marketplace usually want an autonomous tool they can buy once, see the tested steps for, and run on their own model or platform. Popular searches: ai agent marketplace, ai agents marketplace, marketplace for ai agents, buy ai agents, ai agent tools, autonomous ai agents. Related: ai assistants, ai personas, prompts, ai automation, autonomous agents.
What's inside an AI agent
Agents vs assistants, prompts & personas
An agent is one of several AI building blocks on Sigrix. Here is how it differs from the others:
Related guides
Frequently asked questions
More guides in Sigrix Learn, or read the full buyer & seller FAQ.
You are buying a configured, autonomous tool you give a goal to: it plans the steps, calls the tools it needs, and returns a finished result on its own — unlike an assistant, which works with you turn by turn.
An assistant works with you in a back-and-forth conversation. An agent works for you: you set a goal once and it executes the steps autonomously, calling tools and deciding what to do next until the task is done.
Most agents on Sigrix are model-portable — they compile into instructions and tool definitions you can run on OpenAI, Anthropic, or Google models. Each listing shows the model the creator tested the agent on.
Some agents are free to claim and others are paid — each agent's price is shown on its card and detail page. Free or paid, you own an editable copy once you claim it.
Running cost is the model tokens the agent consumes, not a Sigrix fee. Because agents run multiple steps, they use more tokens than a single prompt — every listing shows an estimated token cost per run so you can budget.
Yes. Approved sellers can publish agents on Sigrix: define the runbook, tools, and guardrails, set a price, and list it for buyers to claim. See the Sell page to get started.