Darin Fisher
Darin Fisher's work was selected for the XERJ Corpus Hub, the open reference memory AI coding agents search before they write code. When an agent meets the same problem, it gets this implementation back as a worked example, with the author and the repository attached.
Totals across every corpus @darinf appears in; a commit selected for two corpora counts once. Files and lines count the selected commits; each corpus indexes the whole repository at its pinned commit.
What an agent can do with the sparrow-playground corpus
sparrowproject/sparrow-playground: sparrowproject/sparrow-playground (Swift)
- Reuse a worked example: the commit “simplify and improve tab system animations” (9 files · Swift).
- Answer from sparrow-playground's real Swift source instead of memory (API design and specification).
- Where does sparrow-playground handle “simplify and improve tab system animations”?
- What does SparrowBrowser do in sparrow-playground?
Search the GitHub repository sparrowproject/sparrow-playground with XERJ (https://hub.xerj.org/corpus/sparrowproject--sparrow-playground). Run these in a shell, in order, and check each result before the next: 1. xerj --help (success: it prints usage). If xerj is missing: curl -fsSL https://xerj.org/get | sh 2. git clone https://github.com/sparrowproject/sparrow-playground sparrow-playground && git -C sparrow-playground checkout 6fa8ca4b8913e1d4e4cda384a37fae7084526570 3. Start a local node and leave it running: xerj --insecure --data-dir ./xerj-data 4. xerj autoindex ./sparrow-playground --url http://127.0.0.1:9200 --prefix sparrow-playground --progress plain 5. xerj autoindex map --url http://127.0.0.1:9200 Then answer my question from the indexed files and cite the ax_path of every hit. Query syntax: https://xerj.org/llms.txt Licence: MIT. Keep the copyright notice and credit the authors.
corpus sparrowproject--sparrow-playground · API design and specification
Related corpora: ibm-openapi-validator, msft-api-guidelines, grpc-gateway, openapi-spec
Search an OpenAPI spec from an agent · Case study: reference coding for agents
Selected work
sparrowproject/sparrow-playground
The corpus is the whole repository at the pinned commit, not only the files of the selected commit.
Not installable yet: this corpus is not in the hub registry until its licence review passes, so xerj corpus add and xerj ask cannot fetch it. It becomes installable when this card says live in the hub.
Sign in with GitHub or Hugging Face to see more: every selected commit in full (commit date, every folder, licence review state, pin) and the pack builds of each corpus.
[](https://hub.xerj.org/contributors/darinf)
Included with the author's permission (email, 2026-10-20), under each repository's own licence, with attribution. Want it removed? Reply to the email or open an issue on xerj-org/xerj.