Blog

Notes on retrieval, knowledge modelling and building AI systems.

- File Security
Hidden text in PDFs: what your LLM reads and your users don't
White text, 1 pt fonts and text under shapes reach an LLM but not the person reading the PDF. With CVs as the example: a runnable demo, what studies found, and how to flag it.
October 14, 2026
- Engineering Notes
Our MCP server was fine. Cloudflare was returning HTML.
It took three days, because a parse error points at your own serialization, not at a machine four thousand kilometres away.
September 10, 2026
- Engineering Notes
What real agents found in our MCP server
Our MCP server passed every conformance check. Then one question cost 437,000 tokens.
September 7, 2026

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