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Adam
672e228876
Before: `send_file(to='parent')` from a sub-agent wrote the bytes to the sub-agent's own session outbox, but agent-to-agent routing copied only the content JSON — the target's inbound message referenced `files: ['x.png']` but the bytes lived in a session directory the target couldn't mount. Parent agents orchestrating sub-agents (e.g. Design Team delegating illustration work to an Illustrator sub-agent on Codex) received file-reference messages with nothing to forward. Fix: on route, if the source's content has `files`, copy each referenced file from `<source>/outbox/<src-msg-id>/` to `<target>/inbox/<a2a-msg-id>/`, and emit `attachments` (the existing formatter convention — see formatter.ts:223) with `localPath` relative to `/workspace/`. The target formatter already renders these as `[file: <name> — saved to /workspace/inbox/<a2a-id>/<name>]`, so the target agent sees the path and can call `send_file(path=…, to=…)` to forward onward. Convention matches what session-manager.ts:256 already does for base64-encoded channel-inbound attachments — same inbox layout, same content shape. Nothing on the formatter/agent side needed to change. ## Scope - `forwardAttachedFiles(source, target)` — pure-ish helper that copies files and returns the attachments array. - `forwardFileAttachments(msg, …)` — wraps the helper for the route path: parses content, copies files if present, merges into any existing `attachments`, re-serialises. - `routeAgentMessage` — uses the rewritten content when writing the target's inbound row. - Log line now includes `forwardedFileCount` for observability. Missing source files are skipped with a warning rather than killing the route — a bad filename in a batch shouldn't drop the accompanying text. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>