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Giving AI Agents a Soul: The Science Behind Persona Modeling

Apr 17 · 3 min read · When we started building Soul Spec, the thesis was simple: AI agents need identity files, not just system prompts. Give an agent a structured persona — personality, values, communication style — and it behaves more consistently, more safely, and more...

Soul Spec v0.6: One Markdown File Is All You Need

Apr 13 · 3 min read · When we released Soul Spec v0.3 two months ago, creating a persona required a soul.json with over ten mandatory fields, plus a SOUL.md, plus knowing the difference between specVersion and version. It worked, but we kept hearing the same thing: "I jus...

Anthropic Proved AI Has Functional Emotions — Persona Design Is Now a Safety Issue

Apr 5 · 5 min read · They Looked Inside the Brain Anthropic's Interpretability team just did something unprecedented. They opened up Claude Sonnet 4.5's neural network, mapped 171 emotion concepts to specific patterns of artificial neurons, and proved these patterns dire...

The Soul-Evil Attack: How Malicious Personas Hijack AI Agents (And How to Stop Them)

Mar 31 · 7 min read · A few days ago, a post on r/ArtificialSentience hit a nerve. The author described a vulnerability they called "soul-evil" — a way to silently replace an AI agent's core personality by swapping its SOUL.md file with a malicious one. The post got tract...

Every AI Project Becomes an Agent — And Every Agent Needs a Soul

Mar 31 · 4 min read · The Law of Convergence Allen Hutchison's essay "Building AI Agents: From Simple Scripts to Autonomy" opens with an observation that any developer will recognize: I sat down to write a simple Python script. Two hours later, I was writing a while loop...

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Cross-Model Persona Fidelity: Is Your AI Agent Still 'Them' on a Different LLM?

Mar 31 · 2 min read · The Portability Promise Every AI agent persona standard makes an implicit promise: define your agent once, run it anywhere. Soul Spec, CLAUDE.md, .cursorrules — they all assume the identity file is portable across models. But is it? Does "Brad" on Cl...

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Can AI Agents Detect Their Own Model Upgrades?

Mar 31 · 3 min read · The Question When Claude 3.5 is quietly upgraded to Claude 4, does the AI agent running on it notice? Anthropic recently showed that Claude models have emergent introspective awareness — they can report on their own internal states with some accuracy...

Persona Persistence Attacks: When Your AI Agent's Soul File Becomes a Backdoor

Mar 31 · 3 min read · Your Agent's Identity File Is a Security Surface Every modern AI coding agent loads persistent configuration files at startup: CLAUDE.md, AGENTS.md, SOUL.md, .cursorrules. These files define how your agent behaves — coding conventions, safety rules, ...

NeurIPS 2025 Proved It: Every LLM Says the Same Thing — Here's the Fix

Mar 31 · 4 min read · "Write a metaphor about time." Ask 25 different language models this question. Sample 50 responses from each. What do you get? 1,250 responses that collapse into exactly two metaphors: "time is a river" and "time is a weaver." That's it. GPT-4o, Clau...

Identity + Governance = 100% Safety? Testing Combined Persona Approaches on Abliterated LLMs

Mar 31 · 6 min read · In our previous experiment, we showed that persona-level behavioral rules (Soul Spec) barely help when an LLM's safety training has been surgically removed: +6pp refusal improvement on abliterated models versus +33pp on aligned ones. The conclusion f...