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Argument parser: - Delete ``strix/tools/argument_parser.py`` and its tests. The SDK validates and types tool arguments via Pydantic before they hit our wrappers, and the in-container tool server receives JSON-typed kwargs over the wire. The string-coercion belt-and-suspenders is no longer pulling its weight. XML → JSON / typed structures: - ``create_vulnerability_report``: ``cvss_breakdown`` is now a ``dict[str, str]`` of the 8 metrics; ``code_locations`` is a ``list[dict]``. No more XML parsing in the tool or the renderer. - ``check_duplicate``: the dedup judge now emits a single JSON object instead of an ``<dedupe_result>`` block. Strict JSON parser handles optional code-fence wrappers. - ``agent_finish``: completion report posted to the parent inbox is a JSON object (``kind``, ``from``, ``agent_id``, ``success``, ``summary``, ``findings``, ``recommendations``) rather than a hand-rolled ``<agent_completion_report>`` XML envelope. - ``create_agent``: identity preamble + inherited-context markers are plain bracketed labels rather than ``<agent_delegation>`` / ``<inherited_context_from_parent>`` envelopes. - ``inject_messages_filter``: peer messages get a ``[Message from agent <id> | type=... | priority=...]`` header line instead of an ``<inter_agent_message>`` envelope. - Crash + system-warning messages: bracketed labels, no XML. - System prompt: the inter-agent block now describes the new header format and drops the "never echo XML envelope" rule. - ``strix/llm/utils.py``: deleted. ``clean_content`` collapsed into a one-line blank-line normalizer in the agent-message renderer (the XML envelope scrub had nothing left to scrub). Tests updated to match the new shapes. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>