Commits

Project activity for October 21, 2026:

agents.happitec.com

50 commits

• Implemented Scroll Anchoring for History Loading: Introduced PrependAnchor to prevent the “jump” effect when loading older messages. The system now tracks the row at the top of the visible area and programmatically adjusts the scroll position after prepending new content, ensuring the user’s viewport remains stable.
• Optimized Message Rendering Performance: Developed an EagerWindow mechanism to balance performance and visual stability. Instead of rendering all rows eagerly (which saturated the main thread) or relying entirely on lazy loading (which caused layout jumps), the system now eagerly lays out only the rows immediately surrounding the anchor point.
• Refined History Prefetching and Application: Implemented a “fetch-while-scrolling, apply-at-rest” strategy. Older pages are now prefetched when the user scrolls within a specific threshold (K screens from the top) but are only inserted into the UI once the list comes to a complete rest, eliminating mid-scroll jitter.
• Enhanced Data Loading Efficiency: Reduced the Load Earlier page size from 20 to 10 rows. This minimizes the estimated height added during prepends, reducing the workload for the anchoring system and improving the perceived smoothness of the history timeline.
• Improved UI State Persistence: Added a RowExpansionStore to track the expanded/collapsed state of message rows via replyId. This prevents rows from unexpectedly collapsing when they move between lazy and eager rendering states during a history load.
• Expanded Debugging and Validation Tooling: Built a comprehensive suite of “spike” instruments, including a HistoryShiftProbe to measure pixel-perfect row movement and a SeededHistoryTransport to simulate various paging scenarios and latencies in the simulator.

federatedactivitypublisher

31 commits

• Architectural Redesign of Remote Fetching: Transitioned from per-request clients to a single, long-lived fetch client utilizing swift-openapi-generator. This architecture leverages TaskLocal contexts and a custom ClientMiddleware to dynamically handle target URLs, signing, and scheme policies, significantly improving resource efficiency.
• Hardening of Network Transport & Security: Integrated AsyncHTTPClient (AHC) as the primary transport layer to implement strict connection-level address checks, precise timeout controls (matching Mastodon’s 5s connect/10s read), and rigorous Content-Type validation to prevent unparsable or wildcard MIME types from entering the system.
• Enhanced Security & Access Control: Tightened the InboxFunction security posture by explicitly denying access to sensitive SSM paths, including session-signing keys, JWT-signing keys, and client tokens, ensuring the inbox only accesses the specific actor keys required for its operation.
• Activity Handling & Reliability Fixes: Improved the robustness of federated interactions by implementing signed GET requests for remote actor documents (resolving 401 errors), adding idempotency to Follow activity refreshes, and introducing a “claim-and-process” mechanism for inbox deduplication to ensure failed deliveries are retried.
• Formalization of Reply-Threading Specification: Developed and iteratively refined a comprehensive design spec for reply-threading. This included multiple “skeptic” and advisory review rounds to finalize decisions on JSON-LD canonicalization, vendor-pinning of vetted dependencies, and the creation of a Linux-based test harness for validating TLS and address policies.

…and 12 more repositories.