[FEATURE] Soul & Personality System — Hermes-inspired persistent identity + session switching

[robinmordasiewicz]

Overview

Add a Hermes Agent-inspired personality system to OpenCode that separates intent-routing from identity, supports built-in and custom personalities, and adds session-level switching via `/personality`.

Motivation

The current `soul.txt` is a static F5-specific intent-routing table — not a personality. Users have no way to customize the agent's identity, tone, or communication style. The community-submitted PR #11838 shows demand for this.

Reference

• Hermes Agent Personality Docs
• Hermes Agent Source
• Hermes default_soul.py
• Hermes prompt_builder.py

Architecture

Prompt Stack (slot order):
1. Soul identity  — SOUL.md (user-editable, auto-seeded)
2. Personality overlay — /personality session switching (ephemeral)
3. Routing — routing.txt (F5 capability routing, internal)
4. Provider prompt — model-specific guidance
5. Environment — model info, working dir, date
6. Skills — available skill listing
7. Instructions — AGENTS.md, CLAUDE.md, etc.

Child Issues

• Phase 2: Split soul.txt → routing.txt + default-soul.txt
• Phase 3: Personality types & config schema
• Phase 4: SOUL.md file loading (global + project)
• Phase 5: Built-in personality presets
• Phase 6: /personality slash command
• Phase 7: System prompt assembly integration
• Phase 8: Documentation & cleanup

Development

Branch: `feature/soul-personality`
Approach: Test-driven development (TDD) — tests written before implementation.

[github-actions]

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This issue might be a duplicate of existing issues. Please check:

• [FEATURE]: Auto-discover workspace identity files (SOUL.md, USER.md, TOOLS.md) like AGENTS.md #14285: Auto-discover workspace identity files (SOUL.md, USER.md, TOOLS.md) — directly overlaps with the SOUL.md loading aspect of this request.

If you believe this was flagged incorrectly, please let a maintainer know.

[rekram1-node]

closing for spam