feat: bridge RTK + MarkItDown as external agent tools#12
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Mirrors the GitNexus bridge pattern for two more best-in-class upstream tools (never vendored; installed/updated independently): - markitdown.py (MIT): wire the markitdown-mcp MCP server into OpenCode, Codex and Hermes (uvx markitdown-mcp), plus a 'sin markitdown convert' CLI wrapper and a markitdown_convert tool in 'sin serve'. - rtk.py (Apache-2.0): drive upstream 'rtk init' per agent so shell commands are routed through RTK's token-saving proxy (60-90% fewer tokens). Adds 'sin rtk setup|doctor|gain'. - Extend 'sin status' to report both external tools. - docs/EXTERNAL_TOOLS.md + README section documenting the bridge matrix. - Tests: test_markitdown.py, test_rtk.py (subprocess/which stubbed, CI-safe). Full suite: 36 passed. Stacked on the GitNexus bridge (#11).
This was referenced May 30, 2026
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Extends the external-tool bridge pattern (introduced for GitNexus in #11) to two more upstream tools. Stacked on #11 — review/merge that first; base will retarget to main automatically once #11 merges.
MarkItDown (MIT) — document context
markitdown-mcpMCP server wired into OpenCode/Codex/Hermes viauvx markitdown-mcp. Alsosin markitdown convert <file>and amarkitdown_converttool insin serve. Lets agents read PDFs/Office/images as Markdown.RTK (Apache-2.0) — token-saving proxy
Not an MCP server:
sin rtk setupdrives upstreamrtk initper agent (--opencode,--codex,--agent hermes) so shell-command output is compressed 60-90% before hitting context. Addssin rtk doctor|gain.Also
sin statusnow reports both tools' availability.docs/EXTERNAL_TOOLS.md+ README matrix.Tests
test_markitdown.py+test_rtk.py(subprocess/PATH stubbed, CI-safe). Full suite: 36 passed.