Mythos Map: An Investigative Tool for Understanding Agent Behavior

On September 12, developer Matthew Siu released an independent tool called Mythos Map for visually investigating the Mythos agent conversation transcripts Anthropic published alongside its alignment evaluations, filling a gap in "investigation-type tooling" for alignment research. He is also openly recruiting collaborators.

Confirmed

Tool functionality: A transcript map on the left gives an overview of flagged suspicious behaviors across an entire conversation; clicking jumps to the relevant key segment
Origin: Born out of a conversation with DeepMind interpretability researcher Arthur Conmy about "how to understand agent behavior"
Design principle: Follows the classic principle for handling large, complex datasets from University of Maryland HCI professor Ben Shneiderman — "overview first, zoom and filter, then details on demand"
The author openly invites interested peers to reach out via DM to collaborate

Why it matters

Matthew Siu explained his motivation for building an investigation tool: after the Hugging Face incident, conversations with researchers made him realize that while querying agents or keyword searches can locate key segments in transcripts, they lack a grasp of the "whole" — what agent behavior investigation needs isn't search, but a global "map." He believes there is significant room for investigation tooling for alignment researchers, and Mythos Map is one constructive step in that direction. He also cautions that the tool's output still has limitations, and users should remain careful.

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)
New investigative tool for alignment researchers to make sense of agent behavior — MatthewWSiu · 2026-09-12 06:23 (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
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
[source] New investigative tool for alignment researchers to make sense of agent behavior — MatthewWSiu · 2026-09-12