ax-python-agent

ax-python-agent is a skill for Claude Code, Codex from ax-llm/ax. It costs 49 tokens per session (2,769 once invoked), scanned A, a copy of ax-cpp-agent, Apache-2.0.

A guide for writing Python agents with axllm, a package for building agents that can use tools, child agents, and external services. It also covers typed responses, evidence citations, saved learning, and runtime state.

In plain words
What is it for?
Use it when creating Python agents with delegation, tools, MCP connections, clarification stages, citations, persistent playbooks, or saved and restored runtime state.
Why use it?
It explains the package conventions needed to build agents reliably without mixing in APIs from another language or package.

Skill for Claude CodeCodex

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

Good fit Use it when creating Python agents with delegation, tools, MCP connections, clarification stages, citations, persistent playbooks, or saved and restored runtime state.

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Install with agentmods
npx agentmods add skills/ax-llm/ax/ax-python-agent
About the project

Ax is a TypeScript-first programming framework for building applications with large language models through typed generation, agents, workflows, and optimization tools. It is intended for developers who want one model for LLM programs across TypeScript, Python, Java, C++, Go, Rust, and other runtimes.

ax-llm/ax · 2,967 stars · on GitHub · axllm.dev

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 ax-llm/ax --skill ax-python-agent
Clone the repo
git clone --depth 1 https://github.com/ax-llm/ax

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 ax-python-agent

README.md
[![agentmods](https://agentmods.dev/badge/skills/ax-llm/ax/ax-python-agent/github.svg)](https://agentmods.dev/skills/ax-llm/ax/ax-python-agent)
Your own site
<a href="https://agentmods.dev/skills/ax-llm/ax/ax-python-agent"><img src="https://agentmods.dev/badge/skills/ax-llm/ax/ax-python-agent/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 ax-python-agent

Your own site · 80×15
<a href="https://agentmods.dev/skills/ax-llm/ax/ax-python-agent"><img src="https://agentmods.dev/badge/skills/ax-llm/ax/ax-python-agent.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,769 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 84% copy Near-identical to another mod 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 $0.00049 $0.02769
Opus 5.5 $0.00020 $0.01108
Sonnet 5.5 $0.00010 $0.00554
Haiku 4.5 $0.00005 $0.00277

Measured yesterday against content hash 4ebd0e47a024, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ax-python-agent 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 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.

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.

Origin

This is a copy

84% identical to ax-cpp-agent — 32 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

packages/python/skills/ax-python-agent/SKILL.md · 110 lines

How it starts

The opening of the file, as written. The whole thing — 110 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AxAgent For Python

This skill helps an agent write Python code with the generated Ax package axllm. Use the generated package API, examples, and manifests; do not import TypeScript-only APIs unless you are editing the TypeScript package.

When To Use

  • Create an RLM agent with tools, child agents, or MCP clients.
  • Use clarification, discovery, recall, final, or respond envelopes.
  • Require evidence citations, attach a persistent playbook, or add stage-owned actor instructions.
  • Harvest run-end failures into the playbook and observe citation or playbook updates.
  • Skip the executor stage for no-tool tasks with a distiller respond envelope (directResponse, on by default).
  • Save and restore agent runtime state around long-running tasks.

Package Facts

  • Language: Python.
  • Package: axllm.
  • Package API docs: API.md and axir-api.json.
  • Capability manifest: axir-capabilities.json.
  • Runnable examples: examples/.
  • Real network support: yes.
  • Scripted no-key transport support: yes.
  • Runtime profiles: javascript-quickjs, python-pyodide.

Core Pattern

from axllm import agent

helper = agent("question:string -> answer:string")
out = helper.forward(llm, {"question": "How should I proceed?"})

Astra Session Work

Select gpt-6-astra through the ordinary OpenAI factory. The adapter chooses Responses automatically; existing model defaults are unchanged. Use low reasoning and standard processing. Portable minimal reasoning maps to low; none is rejected. EU residency does not support priority processing.

Keep applications on their generation, agent, and flow entrypoints. Declare only independent tools as background; ordinary and imported MCP tools stay blocking unless the application explicitly changes their declaration. A promise, thread, or MCP hint is not a background declaration. Set asyncMode to off for the ordinary tool loop; chat-only services retain that loop automatically.

Declared-background native agent tools retain the imported MCP schema, handler, namespace, and raw result. Discovery must expose the tool before the model can call it. Invalid arguments are corrected before handler execution; the responder waits for the incorporated result. Native calls appear in action logs and must not be repeated through actor code. Owned child agents inherit selected MCP clients at delegation. Parent stages keep their own clients; none or an empty namespace list passes no parent clients. Explicit child context wins over inherited context. Each run refreshes protocol modules without serializing live client handles into model requests. Cancellation propagates through a delegated child into its pending MCP tool; completed child work is not replayed. Imported MCP tools forward cancellation to context-aware transports, including built-in HTTP. Custom transports using the older send method receive cancellation checks before and after their call; noncooperative work may finish later and its result is discarded. Cancellation does not undo an external action or replay a request. MCP host policy applies to native background calls too. Configure authorizeToolCall in Python, Go, and Java client options, or set_tool_authorizer on C++ and Rust clients before exposing their tools. The callback receives the client and call metadata; returning false denies the call before a tool request is sent. Use shared application policy state when permissions must change during a run.

Read the full file on GitHub · 110 lines

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 Changed 4ebd0e47a024
  2. 3d ago Changed 66ff397277d9
  3. 5d ago Changed fc94428bc0e5
  4. 8d ago Changed ba2e8a891b83
  5. 9d ago Changed d7aac321481f
  6. 10d ago Changed 4d87c1e7ef7d
  7. 16d ago Changed · +10 lines 75a71ac425c4
  8. 19d ago Changed · +24 lines 30af01ddf8b8
  9. 21d ago Changed 0a90c9d5e8e0
  10. 24d ago First seen · 76 lines · 49 tokens per session scan A 37e67e9ac2eb

Subscribe to this mod's changes

ax-python-agent is a skill published in the GitHub repository ax-llm/ax (2,967 stars, last pushed 2d ago), licensed Apache-2.0. It adds 49 tokens to every session and 2,769 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 84% identical to ax-cpp-agent, differing in 32 lines, and is treated as a copy.

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