Three MCP tool groups were orphaned from the ambient CLAUDE.md context
because they shipped no `*.instructions.md` alongside their source.
Backfill them so the composer picks them up as fragments on next spawn:
- core.instructions.md: add `send_file` (artifact delivery, path relative
to /workspace/agent/) and `add_reaction` (by `#N` id with emoji
shortcode name).
- interactive.instructions.md: `ask_user_question` (blocking
multiple-choice with selectedLabel/value option objects, 300s default
timeout) and `send_card` (non-blocking structured render with
fallbackText). Opens with a one-line framing of the contrast between
the two.
- agents.instructions.md: `create_agent` with how-it-works, when-to-use
(companions vs collaborators — persistent memory vs independent
parallel work), when-NOT-to-use (short tasks should use the SDK `Agent`
tool instead), and guidance for writing the seed instructions string.
No composer changes — scan in `src/claude-md-compose.ts` already picks up
any file matching `*.instructions.md` in the mcp-tools directory.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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