Developer Ships Mythos Map, a Visual Investigative Tool for Anthropic Alignment Eval Transcripts

On September 12, developer Matthew Siu released Mythos Map, an independent tool for visually investigating the Mythos agent conversation transcripts published alongside Anthropic's alignment evaluation reports. It fills a gap in "investigative tools" for alignment research, and Siu is openly recruiting collaborators while cautioning that the tool's outputs have limitations.

Confirmed

Functionality: a transcript map on the left gives an overview of flagged suspicious behaviors across the whole conversation; clicking jumps to key segments
Origin: grew out of conversations with DeepMind interpretability researcher Arthur Conmy on how to understand agent behavior
Design principle: follows University of Maryland HCI professor Ben Shneiderman's classic principle for large complex datasets — "overview first, zoom and filter, then details on demand"
Siu publicly invites interested peers to DM him about collaborating

Why it matters

Siu explained his motivation: after the Hugging Face incident, conversations with researchers made him realize that querying agents or keyword search can locate key segments in transcripts but lack a grasp of the "whole" — what agent-behavior investigation lacks is not search but a global "map." He believes there is ample room for investigative tools for alignment researchers, and Mythos Map is a step in that direction. He also cautions that the tool's outputs remain limited and users should stay skeptical.

2026-09-12 ~ 2026-09-12 · 5 related posts

Primary sources

Mythos Map: an independent tool for investigating Anthropic's released alignment transcript — MatthewWSiu · 2026-09-12 05:47 (UTC+08:00)
After the Hugging Face incident, better maps for investigating agent behavior — MatthewWSiu · 2026-09-12 05:47 (UTC+08:00)
Shneiderman's 'overview first' principle applied to agent behavior investigation tools — MatthewWSiu · 2026-09-12 05:47 (UTC+08:00)

[source] Mythos Map: an independent tool for investigating Anthropic's released alignment transcript — MatthewWSiu · 2026-09-12
[source] After the Hugging Face incident, better maps for investigating agent behavior — MatthewWSiu · 2026-09-12
[source] Shneiderman's 'overview first' principle applied to agent behavior investigation tools — MatthewWSiu · 2026-09-12
Investigative tooling for alignment researchers: much more to be built, author says — MatthewWSiu · 2026-09-12
New investigative tool for alignment researchers to make sense of agent behavior — MatthewWSiu · 2026-09-12