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The contributor's original PR (#1917) appended an ``Available Skills`` index to the system prompt before the LLM saw the user message, so the LLM could decide whether to activate a skill. ``7145447b`` removed the text-marker activation flow and, together with it, the entire system prompt injection — but the Tool Call replacement only put the available skills inside the ``activate`` tool's description. In practice the LLM ignores tool descriptions for selection and goes straight to native tools, so user-visible skill activation silently broke. Restore the injection, adapted for the Tool Call era: - SkillManager regains ``get_skill_index(bound_skills)`` and ``build_skill_aware_prompt_addition(bound_skills)``. The addendum carries only ``name (display_name): description`` for each pipeline-visible skill plus one instruction line pointing at the ``activate`` tool. No SKILL.md contents — KV cache stays clean - PreProcessor appends the addendum to the first system message (or inserts a new one) of ``query.prompt.messages`` for the local-agent runner. Handles plain-string and ContentElement[] bodies. Skips cleanly when no skills are visible - 3 new test_preproc cases: injection happens, bound-skills subset honoured, empty addendum touches nothing. 280 passed Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>