{"schema_version":"onlylabs.public_signal.v1","title":"Anthropic Repo: anthropics/jacobian-lens","description":"Anthropic repo signal with public source context, captured evidence pages, related signals, and data-business radar classification.","url":"https://onlylabs.fyi/signals/693bbd5c-76df-4206-a5fb-65efbf47b77f","json_url":"https://onlylabs.fyi/signals/693bbd5c-76df-4206-a5fb-65efbf47b77f/signal.json","generated_at":"2026-07-26T18:43:50.557Z","evidence_latest_fetched_at":"2026-07-07T07:01:31.625906+00:00","signal_first_seen_at":"2026-07-07T07:00:42.559171+00:00","org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab","category_label":"Frontier lab","dossier_url":"https://onlylabs.fyi/labs/anthropic","dossier_json_url":"https://onlylabs.fyi/labs/anthropic/dossier.json"},"related_urls":{"signal":"https://onlylabs.fyi/signals/693bbd5c-76df-4206-a5fb-65efbf47b77f","signal_json":"https://onlylabs.fyi/signals/693bbd5c-76df-4206-a5fb-65efbf47b77f/signal.json","source":"https://github.com/anthropics/jacobian-lens","lab_dossier":"https://onlylabs.fyi/labs/anthropic","lab_dossier_json":"https://onlylabs.fyi/labs/anthropic/dossier.json","analysis":"https://onlylabs.fyi/analysis/anthropic","analysis_json":"https://onlylabs.fyi/analysis/anthropic/analysis.json","analysis_evidence_json":"https://onlylabs.fyi/analysis/anthropic/evidence.json","category":"https://onlylabs.fyi/frontier","category_json":"https://onlylabs.fyi/frontier.json","category_feed":"https://onlylabs.fyi/frontier/feed.xml","category_signals_json":"https://onlylabs.fyi/signals.json","topic":null,"topic_signals_json":null,"topic_feed":null,"data_business":null},"answer_pack":{"answer":"Anthropic published anthropics/jacobian-lens (Python). 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This repository signal exposes tooling, eval, infrastructure, or model-adjacent work before it may appear in a launch post. 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Companion code for [**Verbalizable Representations Form a Global Workspace in Language Models**](https://transformer-circuits.pub/2026/workspace/index.html). The Jacobian lens reads out what an internal activation is disposed to make the model say. It linearly transports a residual-stream vector at any layer and position into the final-layer basis, then decodes it with the model's own unembedding into a ranked list of vocabulary tokens. The transport is the average input–output Jacobian over a text corpus: ``` lens_l(h) = unembed( J_l @ h ), J_l = E[∂h_final / ∂h_l] ``` The expectation is over prompts, source positions, and all current-and-future target positions in a generic web-text corpus; the precise estimator (cotangents summed over target positions, then averaged over source positions) is..."},"evidence_pages":[],"related_signals":[{"id":"3f40cae0-b033-41b3-b230-0b7ac37ad727","url":"https://onlylabs.fyi/signals/3f40cae0-b033-41b3-b230-0b7ac37ad727","source_url":"https://github.com/anthropics/cryptography-research-demo","title":"anthropics/cryptography-research-demo","context":null,"kind":{"key":"repo_new","label":"Repo"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-07-26T01:55:36+00:00","first_seen_at":"2026-07-26T07:00:39.976217+00:00","date_source":"source"},{"id":"0bc3fa86-550b-4e6b-a92f-67909ab0f3cf","url":"https://onlylabs.fyi/signals/0bc3fa86-550b-4e6b-a92f-67909ab0f3cf","source_url":"https://github.com/anthropics/k12-teacher-skills","title":"anthropics/k12-teacher-skills","context":"Python","kind":{"key":"repo_new","label":"Repo"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-07-10T23:00:03+00:00","first_seen_at":"2026-07-15T07:00:41.497175+00:00","date_source":"source"},{"id":"be11c2c5-a4bb-49a2-8bbb-5dd93dcdb2ee","url":"https://onlylabs.fyi/signals/be11c2c5-a4bb-49a2-8bbb-5dd93dcdb2ee","source_url":"https://github.com/anthropics/code-migration-kit-with-claude-code","title":"anthropics/code-migration-kit-with-claude-code","context":"Python","kind":{"key":"repo_new","label":"Repo"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-07-08T14:22:06+00:00","first_seen_at":"2026-07-17T07:00:41.960161+00:00","date_source":"source"},{"id":"5a1cbcc0-156b-461f-ba82-32a6e7124fea","url":"https://onlylabs.fyi/signals/5a1cbcc0-156b-461f-ba82-32a6e7124fea","source_url":"https://github.com/anthropics/claude-tag-plugins","title":"anthropics/claude-tag-plugins","context":"Shell","kind":{"key":"repo_new","label":"Repo"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-06-23T00:39:04+00:00","first_seen_at":"2026-06-24T07:00:29.522017+00:00","date_source":"source"},{"id":"85c49fab-e7a2-4933-91c8-722948f54c4f","url":"https://onlylabs.fyi/signals/85c49fab-e7a2-4933-91c8-722948f54c4f","source_url":"https://github.com/anthropics/launch-your-agent","title":"anthropics/launch-your-agent","context":"HTML","kind":{"key":"repo_new","label":"Repo"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-06-16T14:49:50+00:00","first_seen_at":"2026-06-18T07:00:30.577149+00:00","date_source":"source"},{"id":"d655a3de-1616-4e38-b9a0-27254762c1f0","url":"https://onlylabs.fyi/signals/d655a3de-1616-4e38-b9a0-27254762c1f0","source_url":"https://github.com/anthropics/defending-code-reference-harness","title":"anthropics/defending-code-reference-harness","context":"Python","kind":{"key":"repo_new","label":"Repo"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-05-22T16:00:56+00:00","first_seen_at":"2026-06-05T05:42:58.841369+00:00","date_source":"source"}]}