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docs: document Claude Code dynamic content injection pattern

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Add Claude Code-specific enhancement section to AGENTS.md explaining
the !`command` syntax for injecting shell output into skills at
invocation time. Marked as Claude Code-only to preserve cross-agent
compatibility of SKILL.md files.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Corey Haines
2026-03-19 00:19:25 -07:00
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AGENTS.md
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@@ -219,3 +219,36 @@ When using any skill from this repository:
## Skill Categories
See `README.md` for the current list of skills organized by category. When adding new skills, follow the naming patterns of existing skills in that category.
## Claude Code-Specific Enhancements
These patterns are **Claude Code only** and must not be added to `SKILL.md` files directly, as skills are designed to be cross-agent compatible (Codex, Cursor, Windsurf, etc.). Apply them locally in your own project's `.claude/skills/` overrides instead.
### Dynamic content injection with `!`command``
Claude Code supports embedding shell commands in SKILL.md using `` !`command` `` syntax. When the skill is invoked, Claude Code runs the command and injects the output inline — the model sees the result, not the instruction.
**Most useful application: auto-inject the product marketing context file**
Instead of every skill telling the agent "go check if `.agents/product-marketing-context.md` exists and read it," you can inject it automatically:
```markdown
Product context: !`cat .agents/product-marketing-context.md 2>/dev/null || echo "No product context file found — ask the user about their product before proceeding."`
```
Place this at the top of a skill's body (after frontmatter) to make context available immediately without any file-reading step.
**Other useful injections:**
```markdown
# Inject today's date for recency-sensitive skills
Today's date: !`date +%Y-%m-%d`
# Inject current git branch (useful for workflow skills)
Current branch: !`git branch --show-current 2>/dev/null`
# Inject recent commits for context
Recent commits: !`git log --oneline -5 2>/dev/null`
```
**Why this is Claude Code-only**: Other agents that load skills will see the literal `` !`command` `` string rather than executing it, which would appear as garbled instructions. Keep cross-agent skill files free of this syntax.