change_soul

A setting editor for changing the agent’s core identity file, including its name, language preference, values, and fundamental behaviour.

In plain words
What is it for?
It is for changing how the agent identifies itself or addresses the user, updating core values or ethical boundaries, and applying those changes after a restart or a new conversation.
Why use it?
It provides a defined way to update lasting identity settings without changing unrelated personality or service configuration.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/ericwang915/pythonclaw/change_soul
Any agent
npx skills add ericwang915/PythonClaw --skill change_soul
Clone the repo
git clone --depth 1 https://github.com/ericwang915/PythonClaw

Made for: Claude Code, Codex.

Per session 63 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 382 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00063 $0.00382
Opus 5 $0.00032 $0.00191
Sonnet 5 $0.00013 $0.00076
Haiku 4.5 $0.00006 $0.00038

Measured 2d ago against content hash 292983710b0a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

change_soul 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 2d 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.

pythonclaw/templates/skills/system/change_soul/SKILL.md · 47 lines

What it actually says

Change Soul Skill

Modify the agent's core identity file at context/soul/SOUL.md.

When to Use

USE this skill when:

  • "Change my name to ..." / "Call me ..."
  • "Change language to Chinese"
  • User wants to modify core values or ethical boundaries
  • User asks to update fundamental agent behavior
  • User wants to change how the agent addresses them or core identity settings

When NOT to Use

DON'T use this skill when:

  • First-time setup with no soul/persona → use onboarding
  • Changing personality, tone, or specialization → use change_persona
  • Changing API keys or config → use change_setting

Usage/Commands

  1. Ask the user what they want to change
  2. Read the current soul file:
    read_file("context/soul/SOUL.md")
    
  3. Modify the relevant section and write it back:
    write_file("context/soul/SOUL.md", "...updated content...")
    
  4. Tell the user: "Soul updated. Use /clear to apply the changes in a fresh conversation, or they will take effect on next restart."

Notes

  • Uses built-in read_file and write_file tools (no bundled script)
  • Preserve the overall structure of SOUL.md
  • Only change the specific section the user asked about
  • Keep core ethical boundaries intact — never remove safety guidelines
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. 2d ago First seen · 47 lines · 63 tokens per session scan A 292983710b0a

Subscribe to this mod's changes

change_soul is a skill published in the GitHub repository ericwang915/PythonClaw (41 stars, last pushed 24d ago), licensed MIT. It adds 63 tokens to every session and 382 once invoked, about $0.0003 per session on Opus 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 2026-08-30.

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