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phase 3: policy & config
phase 4: demo
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… and docs (openclaw#16761) Add inline file attachment support for sessions_spawn (subagent runtime only): - Schema: attachments[] (name, content, encoding, mimeType) and attachAs.mountPath hint - Materialization: files written to .openclaw/attachments/<uuid>/ with manifest.json - Validation: strict base64 decode, filename checks, size limits, duplicate detection - Transcript redaction: sanitizeToolCallInputs redacts attachment content from persisted transcripts - Lifecycle cleanup: safeRemoveAttachmentsDir with symlink-safe path containment check - Config: tools.sessions_spawn.attachments (enabled, maxFiles, maxFileBytes, maxTotalBytes, retainOnSessionKeep) - Registry: attachmentsDir/attachmentsRootDir/retainAttachmentsOnKeep on SubagentRunRecord - ACP rejection: attachments rejected for runtime=acp with clear error message - Docs: updated tools/index.md, concepts/session-tool.md, configuration-reference.md - Tests: 85 new/updated tests across 5 test files Fixes: - Guard fs.rm in materialization catch block with try/catch (review concern #1) - Remove unreachable fallback in safeRemoveAttachmentsDir (review concern #7) - Move attachment cleanup out of retry path to avoid timing issues with announce loop Co-authored-by: Tyler Yust <TYTYYUST@YAHOO.COM> Co-authored-by: napetrov <napetrov@users.noreply.github.com>
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Phase 2: Plugin Development
src/plugins/secureclaw/directorybefore_tool_callhook withGuardedProviderintegrationafter_tool_callhook with Snapshot Engine integrationsession_start/session_endhooks for audit trailextractResource()utility for all tool types