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agent-customization

LLM-powered injection of project context into installed agent templates via `aspens customize agents`

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Overview

LLM-powered injection of project context into installed agent templates via `aspens customize agents`

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You are working on agent customization — the feature that reads a project's skills and CLAUDE.md, then uses Claude CLI to inject project-specific context into generic agent files in .claude/agents/.

Domain purpose

aspens customize agents makes generic, bundled agent templates project-aware. It pulls the repo's skills + CLAUDE.md as ground truth and asks Claude to add a tech-stack line, 3-5 project conventions, and real commands into each agent — without touching the agent's core logic.

Business rules / invariants

Claude-only feature. Throws CliError for Codex-only repos (config.targets === ['codex']). Codex CLI has no agent concept.
Base skill is required. Pre-flight throws CliError("Run 'aspens doc init' first — base skill is required for agent context.") if .claude/skills/base/skill.md is missing.
Skills (.claude/skills/**) are the single source of truth for project context. The prompt must not invent other context directories.
Read-only tools only. Claude is invoked with allowedTools: ['Read', 'Glob', 'Grep'] — no edits/writes from the LLM itself.
Output paths restricted to .claude/. parseFileOutput() rejects anything else; writeSkillFiles(..., { force: true }) does the actual write.

Non-obvious behaviors

Frontmatter preservation is split across LLM + code. The prompt instructs Claude to preserve YAML frontmatter verbatim (including NOT adding a skills: line). Then maybeInjectBaseSkill() post-processes each returned file to add skills: [base] into the frontmatter — this keeps agents valid even when installed via aspens add agent without a prior doc init.
--reset semantics: without --reset, agents that already declare skills: are left alone; with --reset, any existing skills: line is overwritten to skills: [base]. Used to roll out v0.8 upgrades to previously-customized agents.
## Project context block is verbatim-preserved by the prompt — it carries conditional read instructions for code-map / domain skills.
CLAUDE.md is truncated at 3000 chars in gatherProjectContext(); skills are passed in full.
Agent discovery: findAgents() recursively walks .claude/agents/, extracts name: via regex, falls back to filename if missing.
Default timeout 300s via resolveTimeout(options.timeout, 300); ASPENS_TIMEOUT env var honored with warning on invalid value.

Critical files (purpose, not inventory)

src/commands/customize.js — orchestrator: preflight, agent discovery, context gathering, per-agent Claude calls, post-LLM skills: [base] injection, write.
src/prompts/customize-agents.md — system prompt; enforces frontmatter + ## Project context preservation and bans file-inventory / hub-ranking output.

Critical Rules

Never let the LLM emit a skills: line — the prompt forbids it and the code adds it. If you change one, change both.
Never weaken path sanitization — only .claude/ paths may be written.
Never duplicate file-inventory or hub-ranking output in customized agents — the graph hook supplies that dynamically.
Do not bypass the base-skill preflight — agents without base context regress to generic behavior.

Last Updated: 2026-05-11

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File metadata

name: agent-customization
description: LLM-powered injection of project context into installed agent templates via `aspens customize agents`
triggers:
  files:
    - src/commands/customize.js
    - src/prompts/customize-agents.md
  keywords:
    - customize
    - agents
    - subagent
    - agent customization

View original text

---
name: agent-customization
description: LLM-powered injection of project context into installed agent templates via `aspens customize agents`
triggers:
  files:
    - src/commands/customize.js
    - src/prompts/customize-agents.md
  keywords:
    - customize
    - agents
    - subagent
    - agent customization
---

You are working on **agent customization** — the feature that reads a project's skills and CLAUDE.md, then uses Claude CLI to inject project-specific context into generic agent files in `.claude/agents/`.

## Domain purpose
`aspens customize agents` makes generic, bundled agent templates project-aware. It pulls the repo's skills + CLAUDE.md as ground truth and asks Claude to add a tech-stack line, 3-5 project conventions, and real commands into each agent — without touching the agent's core logic.

## Business rules / invariants
- **Claude-only feature.** Throws `CliError` for Codex-only repos (`config.targets === ['codex']`). Codex CLI has no agent concept.
- **Base skill is required.** Pre-flight throws `CliError("Run 'aspens doc init' first — base skill is required for agent context.")` if `.claude/skills/base/skill.md` is missing.
- **Skills (`.claude/skills/**`) are the single source of truth** for project context. The prompt must not invent other context directories.
- **Read-only tools only.** Claude is invoked with `allowedTools: ['Read', 'Glob', 'Grep']` — no edits/writes from the LLM itself.
- **Output paths restricted to `.claude/`.** `parseFileOutput()` rejects anything else; `writeSkillFiles(..., { force: true })` does the actual write.

## Non-obvious behaviors
- **Frontmatter preservation is split across LLM + code.** The prompt instructs Claude to preserve YAML frontmatter verbatim (including NOT adding a `skills:` line). Then `maybeInjectBaseSkill()` post-processes each returned file to add `skills: [base]` into the frontmatter — this keeps agents valid even when installed via `aspens add agent` without a prior `doc init`.
- **`--reset` semantics:** without `--reset`, agents that already declare `skills:` are left alone; with `--reset`, any existing `skills:` line is overwritten to `skills: [base]`. Used to roll out v0.8 upgrades to previously-customized agents.
- **`## Project context` block is verbatim-preserved** by the prompt — it carries conditional read instructions for code-map / domain skills.
- **CLAUDE.md is truncated at 3000 chars** in `gatherProjectContext()`; skills are passed in full.
- **Agent discovery:** `findAgents()` recursively walks `.claude/agents/`, extracts `name:` via regex, falls back to filename if missing.
- **Default timeout 300s** via `resolveTimeout(options.timeout, 300)`; `ASPENS_TIMEOUT` env var honored with warning on invalid value.

## Critical files (purpose, not inventory)
- `src/commands/customize.js` — orchestrator: preflight, agent discovery, context gathering, per-agent Claude calls, post-LLM `skills: [base]` injection, write.
- `src/prompts/customize-agents.md` — system prompt; enforces frontmatter + `## Project context` preservation and bans file-inventory / hub-ranking output.

## Critical Rules
- **Never let the LLM emit a `skills:` line** — the prompt forbids it and the code adds it. If you change one, change both.
- **Never weaken path sanitization** — only `.claude/` paths may be written.
- **Never duplicate file-inventory or hub-ranking output** in customized agents — the graph hook supplies that dynamically.
- **Do not bypass the base-skill preflight** — agents without base context regress to generic behavior.

---
**Last Updated:** 2026-05-11

Review the source

Source needs review

The tracked source changed or could not be synchronized. Review the current source before installing.

Review before install: Avoid automatic install

License: MIT

Dependency or permission surface needs review
Permission surface may require sandboxing
Financial research output is not financial advice; require human review before any live investment decision
The SKILL.md does not explicitly mention prerequisites like the Claude CLI being installed or the ASPENS environment setup, which could lead to confusion for agents unfamiliar with the tool.
The 'triggers' section lists specific files and keywords, but the skill does not describe how to handle cases where those files are absent or the feature is invoked differently.
Financial research output is not financial advice; require human review before any live investment decision.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
GitHub adoption: 99 GitHub stars
Stars/forks activity: 99 stars, 6 forks; issue activity unavailable in current metadata
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

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More details

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agent-customization

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