{"schema_version":"onlylabs.public_signal.v1","title":"Anthropic Fork: anthropics/sse-starlette","description":"Anthropic fork signal with public source context, captured evidence pages, related signals, and data-business radar classification.","url":"https://onlylabs.fyi/signals/1729f385-c8fe-4021-98ad-e50a63f9addc","json_url":"https://onlylabs.fyi/signals/1729f385-c8fe-4021-98ad-e50a63f9addc/signal.json","generated_at":"2026-06-11T03:18:27.883284+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/1729f385-c8fe-4021-98ad-e50a63f9addc","signal_json":"https://onlylabs.fyi/signals/1729f385-c8fe-4021-98ad-e50a63f9addc/signal.json","source":"https://github.com/anthropics/sse-starlette","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":"https://onlylabs.fyi/topics/forks","topic_signals_json":"https://onlylabs.fyi/topics/forks/signals.json","topic_feed":"https://onlylabs.fyi/topics/forks/feed.xml","data_business":null},"answer_pack":{"answer":"Anthropic forked anthropics/sse-starlette (forked from sysid/sse-starlette). This fork signal points to upstream code the lab may be inspecting, patching, or building on. High-signal details: repo anthropics/sse-starlette · parent sysid/sse-starlette. onlylabs links this event to 1 captured evidence page and 6 related fork signals.","signal_desk":"forks","source_context":{"source_url":"https://github.com/anthropics/sse-starlette","source_host":"github.com","occurred_at":"2022-12-28T07:32:54+00:00","first_seen_at":"2026-06-05T05:42:58.841369+00:00","date_source":"source","context":"forked from sysid/sse-starlette"},"context_markers":[{"label":"Lab","value":"Anthropic","source":"signal"},{"label":"Signal desk","value":"forks","source":"signal"},{"label":"Source host","value":"github.com","source":"source"},{"label":"Repository","value":"anthropics/sse-starlette","source":"source"},{"label":"Parent","value":"sysid/sse-starlette","source":"source"},{"label":"Stars","value":"9","source":"traction"},{"label":"Watch term","value":"Agents and tool use","source":"evidence"}],"evidence_coverage":{"target_pages":1,"captured_pages":1,"readable_pages":1,"capture_methods":["plain"],"missing_page_urls":[],"failed_page_urls":[],"blocked_page_urls":[],"page_urls":["https://github.com/anthropics/sse-starlette"],"related_signals":6,"has_source_url":true,"latest_page_fetched_at":"2026-06-11T03:18:27.883284+00:00"},"data_business":{"matches":false,"lanes":[],"matched_terms":[],"score":null,"reason":null},"agent_handoff":{"signal_json":"https://onlylabs.fyi/signals/1729f385-c8fe-4021-98ad-e50a63f9addc/signal.json","dossier_json":"https://onlylabs.fyi/labs/anthropic/dossier.json","analysis_json":"https://onlylabs.fyi/analysis/anthropic/analysis.json","analysis_evidence_json":"https://onlylabs.fyi/analysis/anthropic/evidence.json","topic_signals_json":"https://onlylabs.fyi/topics/forks/signals.json","topic_feed":"https://onlylabs.fyi/topics/forks/feed.xml","category_signals_json":"https://onlylabs.fyi/signals.json","data_radar_json":null,"opportunities_json":null},"analysis_playbook":{"objective":"Turn fork activity into a map of upstream tools, libraries, model utilities, agent frameworks, and research dependencies being inspected or adapted.","evidence_focus":["forked parent repo","repo owner","language","description","stars","org and recency"],"extraction_questions":["Which upstream projects are repeated across labs?","Which forks point to evals, agents, infrastructure, model tooling, or data pipelines?","Which low-profile forks could precede a release or hiring wave?","Which labs are converging on the same technical adjacency?"],"signal_questions":["What upstream dependency or technical adjacency does this fork reveal?","Which upstream projects are repeated across labs?","Which forks point to evals, agents, infrastructure, model tooling, or data pipelines?","Do the 6 related fork signals show a repeated pattern?"],"output_fields":["org","upstream_repo","language","technical_theme","data_business_lane","evidence_url"],"data_business_relevance":"Forks expose what frontier-lab engineers are building on before polished announcements, making them useful for partnership and product wedge discovery.","required_sources":[{"label":"signal_json","url":"https://onlylabs.fyi/signals/1729f385-c8fe-4021-98ad-e50a63f9addc/signal.json","required":true},{"label":"source","url":"https://github.com/anthropics/sse-starlette","required":true},{"label":"dossier_json","url":"https://onlylabs.fyi/labs/anthropic/dossier.json","required":true},{"label":"analysis_evidence_json","url":"https://onlylabs.fyi/analysis/anthropic/evidence.json","required":true},{"label":"topic_signals_json","url":"https://onlylabs.fyi/topics/forks/signals.json","required":false},{"label":"data_radar_json","url":null,"required":false}],"expected_output":["one-paragraph source-grounded interpretation","category-specific implication","confidence and missing evidence","recommended next source to inspect"],"prompt_seed":"Using only the linked onlylabs JSON, captured source context, and cited evidence, analyze Anthropic's fork signal \"anthropics/sse-starlette\" for frontier lab strategy."},"semantic_triples":[{"subject":"Anthropic","predicate":"forked","object":"anthropics/sse-starlette","text":"Anthropic forked anthropics/sse-starlette."},{"subject":"anthropics/sse-starlette","predicate":"is classified as","object":"fork signal","text":"anthropics/sse-starlette is classified as fork signal."},{"subject":"anthropics/sse-starlette","predicate":"belongs to","object":"forks desk","text":"anthropics/sse-starlette belongs to forks desk."},{"subject":"anthropics/sse-starlette","predicate":"has context","object":"forked from sysid/sse-starlette","text":"anthropics/sse-starlette has context forked from sysid/sse-starlette."},{"subject":"anthropics/sse-starlette","predicate":"has evidence coverage","object":"1 captured evidence page","text":"anthropics/sse-starlette has evidence coverage 1 captured evidence page."},{"subject":"anthropics/sse-starlette","predicate":"has captured page count","object":"1","text":"anthropics/sse-starlette has captured page count 1."},{"subject":"anthropics/sse-starlette","predicate":"has readable page count","object":"1","text":"anthropics/sse-starlette has readable page count 1."},{"subject":"anthropics/sse-starlette","predicate":"has related signal count","object":"6","text":"anthropics/sse-starlette has related signal count 6."},{"subject":"anthropics/sse-starlette","predicate":"has analysis playbook objective","object":"Turn fork activity into a map of upstream tools, libraries, model utilities, agent frameworks, and research dependencies being inspected or adapted.","text":"anthropics/sse-starlette has analysis playbook objective Turn fork activity into a map of upstream tools, libraries, model utilities, agent frameworks, and research dependencies being inspected or adapted.."},{"subject":"anthropics/sse-starlette","predicate":"has source host","object":"github.com","text":"anthropics/sse-starlette has source host github.com."},{"subject":"anthropics/sse-starlette","predicate":"has lab","object":"Anthropic","text":"anthropics/sse-starlette has lab Anthropic."},{"subject":"anthropics/sse-starlette","predicate":"has signal desk","object":"forks","text":"anthropics/sse-starlette has signal desk forks."},{"subject":"anthropics/sse-starlette","predicate":"has source host","object":"github.com","text":"anthropics/sse-starlette has source host github.com."},{"subject":"anthropics/sse-starlette","predicate":"has repository","object":"anthropics/sse-starlette","text":"anthropics/sse-starlette has repository anthropics/sse-starlette."},{"subject":"anthropics/sse-starlette","predicate":"has parent","object":"sysid/sse-starlette","text":"anthropics/sse-starlette has parent sysid/sse-starlette."},{"subject":"anthropics/sse-starlette","predicate":"has stars","object":"9","text":"anthropics/sse-starlette has stars 9."},{"subject":"anthropics/sse-starlette","predicate":"has watch term","object":"Agents and tool use","text":"anthropics/sse-starlette has watch term Agents and tool use."}]},"intelligence":{"signal_desk":"forks","answer":"Anthropic forked anthropics/sse-starlette (forked from sysid/sse-starlette). This fork signal points to upstream code the lab may be inspecting, patching, or building on. High-signal details: repo anthropics/sse-starlette · parent sysid/sse-starlette. onlylabs links this event to 1 captured evidence page and 6 related fork signals.","semantic_triples":[{"subject":"Anthropic","predicate":"forked","object":"anthropics/sse-starlette","text":"Anthropic forked anthropics/sse-starlette."},{"subject":"anthropics/sse-starlette","predicate":"is classified as","object":"fork signal","text":"anthropics/sse-starlette is classified as fork signal."},{"subject":"anthropics/sse-starlette","predicate":"belongs to","object":"forks desk","text":"anthropics/sse-starlette belongs to forks desk."},{"subject":"anthropics/sse-starlette","predicate":"has context","object":"forked from sysid/sse-starlette","text":"anthropics/sse-starlette has context forked from sysid/sse-starlette."},{"subject":"anthropics/sse-starlette","predicate":"has evidence coverage","object":"1 captured evidence page","text":"anthropics/sse-starlette has evidence coverage 1 captured evidence page."}]},"signal":{"id":"1729f385-c8fe-4021-98ad-e50a63f9addc","url":"https://onlylabs.fyi/signals/1729f385-c8fe-4021-98ad-e50a63f9addc","json_url":"https://onlylabs.fyi/signals/1729f385-c8fe-4021-98ad-e50a63f9addc/signal.json","source_url":"https://github.com/anthropics/sse-starlette","title":"anthropics/sse-starlette","summary":"Anthropic forked upstream code. onlylabs watches forks for tooling, infrastructure, research dependencies, and product-adjacent work.","context":"forked from sysid/sse-starlette","kind":{"key":"repo_forked","label":"Fork"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2022-12-28T07:32:54+00:00","first_seen_at":"2026-06-05T05:42:58.841369+00:00","date_source":"source","evidence_coverage":{"target_pages":1,"captured_pages":1,"readable_pages":1,"capture_methods":["plain"],"missing_page_urls":[],"failed_page_urls":[],"blocked_page_urls":[],"page_urls":["https://github.com/anthropics/sse-starlette"]},"facets":{"repo":"anthropics/sse-starlette","parent":"sysid/sse-starlette"},"traction":{"github_stars":9,"hn_points":null,"hn_comments":null,"hn_story_id":null,"hf_downloads":null,"hf_likes":null},"data_radar":null},"primary_evidence_page":{"url":"https://github.com/anthropics/sse-starlette","final_url":"https://github.com/anthropics/sse-starlette","title":"anthropics/sse-starlette repository metadata","http_status":200,"content_type":"application/json","capture_method":"plain","fetched_at":"2026-06-11T03:18:27.883284+00:00","bytes":22976,"raw_path":"112ab3ca92ca7eaccefc34b590e07972911debb41959ec52724fbe9409ca4722.json","content_hash":"2ead65b7c02ea5d81a37cd4d4d037909284e6790aba736be066c6f367a74e691","excerpt_chars":1200,"truncated":true,"excerpt":"anthropics/sse-starlette License: BSD-3-Clause Stars: 9 Forks: 6 Open issues: 0 Created: 2022-12-28T07:32:54Z Pushed: 2022-12-27T16:06:16Z Default branch: master Fork: yes Parent repository: sysid/sse-starlette Archived: no README: Server Sent Events for [Starlette](https://github.com/encode/starlette) and [FastAPI](https://fastapi.tiangolo.com/) [![PyPI Version][pypi-image]][pypi-url] [![Build Status][build-image]][build-url] [![Code Coverage][coverage-image]][coverage-url] Background: https://sysid.github.io/server-sent-events/ Installation: ```shell pip install sse-starlette ``` Usage: ```python import asyncio import uvicorn from starlette.applications import Starlette from starlette.routing import Route from sse_starlette.sse import EventSourceResponse async def numbers(minimum, maximum): for i in range(minimum, maximum + 1): await asyncio.sleep(0.9) yield dict(data=i) async def sse(request): generator = numbers(1, 5) return EventSourceResponse(generator) routes = [ Route(\"/\", endpoint=sse) ] app = Starlette(debug=True, routes=routes) if __name__ == \"__main__\": uvicorn.run(app, host=\"0.0.0.0\", port=8000, log_level='info') ``` Output: ![output](output.png) **Caveat:** SSE..."},"evidence_pages":[{"url":"https://github.com/anthropics/sse-starlette","final_url":"https://github.com/anthropics/sse-starlette","title":"anthropics/sse-starlette repository metadata","http_status":200,"content_type":"application/json","capture_method":"plain","fetched_at":"2026-06-11T03:18:27.883284+00:00","bytes":22976,"raw_path":"112ab3ca92ca7eaccefc34b590e07972911debb41959ec52724fbe9409ca4722.json","content_hash":"2ead65b7c02ea5d81a37cd4d4d037909284e6790aba736be066c6f367a74e691","excerpt_chars":1200,"truncated":true,"excerpt":"anthropics/sse-starlette License: BSD-3-Clause Stars: 9 Forks: 6 Open issues: 0 Created: 2022-12-28T07:32:54Z Pushed: 2022-12-27T16:06:16Z Default branch: master Fork: yes Parent repository: sysid/sse-starlette Archived: no README: Server Sent Events for [Starlette](https://github.com/encode/starlette) and [FastAPI](https://fastapi.tiangolo.com/) [![PyPI Version][pypi-image]][pypi-url] [![Build Status][build-image]][build-url] [![Code Coverage][coverage-image]][coverage-url] Background: https://sysid.github.io/server-sent-events/ Installation: ```shell pip install sse-starlette ``` Usage: ```python import asyncio import uvicorn from starlette.applications import Starlette from starlette.routing import Route from sse_starlette.sse import EventSourceResponse async def numbers(minimum, maximum): for i in range(minimum, maximum + 1): await asyncio.sleep(0.9) yield dict(data=i) async def sse(request): generator = numbers(1, 5) return EventSourceResponse(generator) routes = [ Route(\"/\", endpoint=sse) ] app = Starlette(debug=True, routes=routes) if __name__ == \"__main__\": uvicorn.run(app, host=\"0.0.0.0\", port=8000, log_level='info') ``` Output: ![output](output.png) **Caveat:** SSE..."}],"related_signals":[{"id":"041e270f-4748-413b-a5de-0b337c854bd2","url":"https://onlylabs.fyi/signals/041e270f-4748-413b-a5de-0b337c854bd2","source_url":"https://github.com/anthropics/leptos-chartistry","title":"anthropics/leptos-chartistry","context":"forked from feral-dot-io/leptos-chartistry","kind":{"key":"repo_forked","label":"Fork"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-06-10T19:26:54+00:00","first_seen_at":"2026-06-11T07:01:08.072455+00:00","date_source":"source"},{"id":"f4b00ac5-5aca-497f-870a-91f453ea4d1e","url":"https://onlylabs.fyi/signals/f4b00ac5-5aca-497f-870a-91f453ea4d1e","source_url":"https://github.com/anthropics/riegeli-rs","title":"anthropics/riegeli-rs","context":"forked from mikedanese/riegeli-rs","kind":{"key":"repo_forked","label":"Fork"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-06-01T15:52:56+00:00","first_seen_at":"2026-06-05T05:42:58.841369+00:00","date_source":"source"},{"id":"e668bf82-c053-45aa-9a48-b7466bf6f770","url":"https://onlylabs.fyi/signals/e668bf82-c053-45aa-9a48-b7466bf6f770","source_url":"https://github.com/anthropics/swift-markdown","title":"anthropics/swift-markdown","context":"forked from swiftlang/swift-markdown","kind":{"key":"repo_forked","label":"Fork"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-05-08T19:58:26+00:00","first_seen_at":"2026-06-05T05:42:58.841369+00:00","date_source":"source"},{"id":"3f83f284-526e-4b26-8561-718a0d42388e","url":"https://onlylabs.fyi/signals/3f83f284-526e-4b26-8561-718a0d42388e","source_url":"https://github.com/anthropics/terragrunt","title":"anthropics/terragrunt","context":"forked from gruntwork-io/terragrunt","kind":{"key":"repo_forked","label":"Fork"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-03-18T22:07:33+00:00","first_seen_at":"2026-06-05T05:42:58.841369+00:00","date_source":"source"},{"id":"648489db-4bb9-4245-864a-710825df4b53","url":"https://onlylabs.fyi/signals/648489db-4bb9-4245-864a-710825df4b53","source_url":"https://github.com/anthropics/tokio","title":"anthropics/tokio","context":"forked from tokio-rs/tokio","kind":{"key":"repo_forked","label":"Fork"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-03-12T20:12:10+00:00","first_seen_at":"2026-06-05T05:42:58.841369+00:00","date_source":"source"},{"id":"d6cacc0b-2fd9-4188-b257-32bc34b53ca7","url":"https://onlylabs.fyi/signals/d6cacc0b-2fd9-4188-b257-32bc34b53ca7","source_url":"https://github.com/anthropics/maestro","title":"anthropics/maestro","context":"forked from Netflix/maestro","kind":{"key":"repo_forked","label":"Fork"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-02-15T05:54:51+00:00","first_seen_at":"2026-06-05T05:42:58.841369+00:00","date_source":"source"}]}