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feat: add fastapi optional dependency extra #1086

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feat: add fastapi optional dependency extra #1086

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7388d60
feat: add `fastapi` optional dependency extra
martimfasantos May 29, 2026
cb881e4
test(install-smoke): cover `fastapi` extra and refine import-error wo…
martimfasantos May 29, 2026
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1 change: 1 addition & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,7 @@ Install the core SDK and any desired extras using your preferred package manager
| **Core SDK** | `uv add a2a-sdk` | `pip install a2a-sdk` |
| **All Extras** | `uv add "a2a-sdk[all]"` | `pip install "a2a-sdk[all]"` |
| **HTTP Server** | `uv add "a2a-sdk[http-server]"` | `pip install "a2a-sdk[http-server]"` |
| **FastAPI** | `uv add "a2a-sdk[fastapi]"` | `pip install "a2a-sdk[fastapi]"` |
| **gRPC Support** | `uv add "a2a-sdk[grpc]"` | `pip install "a2a-sdk[grpc]"` |
| **OpenTelemetry Tracing**| `uv add "a2a-sdk[telemetry]"` | `pip install "a2a-sdk[telemetry]"` |
| **Encryption** | `uv add "a2a-sdk[encryption]"` | `pip install "a2a-sdk[encryption]"` |
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2 changes: 2 additions & 0 deletions pyproject.toml
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Expand Up @@ -35,6 +35,7 @@ classifiers = [

[project.optional-dependencies]
http-server = ["sse-starlette", "starlette"]
fastapi = ["a2a-sdk[http-server]", "fastapi>=0.115.2"]
encryption = ["cryptography>=43.0.0"]
grpc = ["grpcio>=1.60", "grpcio-tools>=1.60", "grpcio-status>=1.60", "grpcio_reflection>=1.7.0"]
telemetry = ["opentelemetry-api>=1.33.0", "opentelemetry-sdk>=1.33.0"]
Expand All @@ -48,6 +49,7 @@ sql = ["a2a-sdk[postgresql,mysql,sqlite]"]

all = [
"a2a-sdk[http-server]",
"a2a-sdk[fastapi]",
"a2a-sdk[sql]",
"a2a-sdk[encryption]",
"a2a-sdk[grpc]",
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4 changes: 2 additions & 2 deletions src/a2a/server/routes/fastapi_routes.py
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Expand Up @@ -135,8 +135,8 @@ def add_a2a_routes_to_fastapi(
if not _package_fastapi_installed:
raise ImportError(
'The `fastapi` package is required to use '
'`add_a2a_routes_to_fastapi`. Install it alongside '
'`a2a-sdk[http-server]`.'
'`add_a2a_routes_to_fastapi`. It can be installed as part of '
'`a2a-sdk` optional dependencies, `a2a-sdk[fastapi]`.'

@gemini-code-assist gemini-code-assist Bot May 29, 2026

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low

The error message can be made more direct and actionable by instructing the user to install a2a-sdk[fastapi] directly, rather than describing it as an optional dependency.

Suggested change
'The `fastapi` package is required to use '
'`add_a2a_routes_to_fastapi`. Install it alongside '
'`a2a-sdk[http-server]`.'
'`add_a2a_routes_to_fastapi`. It can be installed as part of '
'`a2a-sdk` optional dependencies, `a2a-sdk[fastapi]`.'
'The "fastapi" package is required to use '
'"add_a2a_routes_to_fastapi". Please install '
'"a2a-sdk[fastapi]".'

@martimfasantos martimfasantos May 29, 2026

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Addressed in cb881e4 — message is now Install it via a2a-sdk[fastapi]. (matching the wording in #1087).

)

components: dict[str, Any] = {}
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12 changes: 11 additions & 1 deletion uv.lock
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