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Use the artifacts

The documents come in two forms: as they are on main, from this site, and as released, from a GitHub Release. Downloads lists both.

From this site​

base=https://beyond10x.github.io/a2a/downloads
for f in SHA256SUMS a2a.proto a2a-upstream.openapi.yaml a2a-http.openapi.yaml \
         a2a.openapi.yaml a2a.asyncapi.yaml a2a.schema.json; do
  curl -fsSLO "$base/$f"
done
sha256sum --check SHA256SUMS

sha256sum --check prints OK for each file and exits 0 when every file matches.

From a release​

The assets of a release carry its version in their names, and the release's own SHA256SUMS covers them. Set v to the release you want; Downloads names the latest.

v=0.3.0
base=https://github.com/beyond10x/a2a/releases/download/$v
for f in SHA256SUMS a2a.proto a2a-$v-upstream.openapi.yaml a2a-$v.openapi.yaml a2a-$v-http.openapi.yaml \
         a2a-$v.asyncapi.yaml a2a-$v-json-schema.tar.gz a2a-$v-specification.tar.gz; do
  curl -fsSLO "$base/$f"
done
sha256sum --check SHA256SUMS

One schema out of the bundle​

a2a.schema.json is one JSON Schema 2020-12 document. Each file of generated/schema/schema/ is a resource under $defs, keyed <directory>.<name>, with its own $id relative to the bundle. Every $ref in a resource points into that resource's own $defs, so a schema taken out of the bundle needs nothing else.

List the keys, then take one schema out:

jq -r '."$defs" | keys[]' a2a.schema.json
jq '."$defs"["entities.a2a.tasks.Task"]' a2a.schema.json > task.schema.json