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2 posts with the tag “sec”

Agent information flow

- 1 min read - 200 words
Brett Dargan
Brett Dargan
Principal Solutions Architect (AWS) | Tech Co-Founder | Product Strategy & Business Value

OpenAPPA

OpenAPPA sits between an agent and its tools and answers one question before every action: is this data allowed to go to this destination?

It is powered by APPA (Agentic Permissions Policy Algebra). OpenAPPA tracks the sensitivity and trust of everything an agent reads and checks each tool call against it before the call runs, so sensitive data never reaches an unauthorized tool. Classifiers and PII detectors are probabilistic, while this check is deterministic and returns the same decision on every run.

OpenAPPA is a frontier deterministic AI guardrail that is 100% resistant to data exfiltration caused by prompt injection or model hallucination, and the first of its kind that doesn’t break agents.

2026 Week 06 - Search and mixture of models

- 1 min read - 200 words
Brett Dargan
Brett Dargan
Principal Solutions Architect (AWS) | Tech Co-Founder | Product Strategy & Business Value

2026W06

Trying out Opencode with direct xAI provider.

Interesting paper on search / retrieval

Superlink bm25 and mixture of models.

GitHub - parthsarthi03/raptor: The official implementation of RAPTOR: Recursive Abstractive Processing for Tree-Organized Retrieval Airbnb Search Benchmarking - Comparison of retrieval techniques | VectorHub by Superlinked

Way back we used Elasticsearch for hotel search at Wotif.com, interesting this approach with mixing of models.

On Local-First

Watched an intewview with jamsocket creator in my local-first readings, plane is super interesting.

RAG from scratch

Safety