diff --git a/data/ecosystem.toml b/data/ecosystem.toml
index ff924cd..a685eee 100644
--- a/data/ecosystem.toml
+++ b/data/ecosystem.toml
@@ -1,28 +1,28 @@
 schema_version = 1
 as_of = "2026-07-30"
 source_repository = "hayatepy/.github"
-source_commit = "0b44120a8e73d45fcfdfc1ce879faf5cd3452243"
-compatibility_url = "https://github.com/hayatepy/.github/blob/0b44120a8e73d45fcfdfc1ce879faf5cd3452243/docs/COMPATIBILITY.md"
+source_commit = "975173da2c1be720a4f902cde36ba3822b9b6e56"
+compatibility_url = "https://github.com/hayatepy/.github/blob/975173da2c1be720a4f902cde36ba3822b9b6e56/docs/COMPATIBILITY.md"
 
 [[packages]]
 name = "hayate"
 version = "0.15.1"
 status = "Published alpha"
-role = "Core framework and native runtime adapters"
+role = "Core framework and native ASGI, Workers, and Lambda adapters"
 use_when = "Build one Fetch-style Python application for ASGI, Workers, or Lambda."
 repository = "https://github.com/hayatepy/hayate"
 pypi = "https://pypi.org/project/hayate/"
-source_commit = "9e27b0191c7fa9f920ad6fe5b126e190268afba2"
+source_commit = "5592276315c9b75e736d3fc204b4900e15f8867a"
 
 [[packages]]
 name = "create-hayate"
-version = "0.12.0"
+version = "0.13.0"
 status = "Published alpha"
-role = "Composable project generator"
-use_when = "Start with a tested API, Workers, MCP, auth, SQL, admin, or frontend composition."
+role = "Composable applications with drift-checked first-party TypeScript clients"
+use_when = "Start with a tested API, Workers, MCP, auth, SQL, admin, or frontend composition and keep its generated client in sync."
 repository = "https://github.com/hayatepy/create-hayate"
 pypi = "https://pypi.org/project/create-hayate/"
-source_commit = "a1974325ce62a4bce5c6ceab27211675e07b0001"
+source_commit = "9fdb98e5642ff047e04e24251be1c2747fc7572a"
 
 [[packages]]
 name = "hayate-auth"
@@ -46,13 +46,13 @@ source_commit = "175e6ed85a5e9af3e2fd9fcbf8886594bd2f6723"
 
 [[packages]]
 name = "hayate-openapi"
-version = "0.7.0"
+version = "0.8.1"
 status = "Published alpha"
-role = "OpenAPI 3.1, typed endpoints, Scalar, and TypeScript contracts"
-use_when = "Make runtime validation, API documentation, and client types share one contract."
+role = "OpenAPI 3.1, Scalar, and generated zero-runtime TypeScript clients"
+use_when = "Make runtime validation, API documentation, client types, and a callable Fetch client share one contract."
 repository = "https://github.com/hayatepy/hayate-openapi"
 pypi = "https://pypi.org/project/hayate-openapi/"
-source_commit = "5d274a7cc337c3336d5316421691779504e592f7"
+source_commit = "2ed34215ec3dd5ebd0a0780f7b7903f0b3492a78"
 
 [[packages]]
 name = "hayate-sql"
@@ -99,4 +99,4 @@ status = "Reference application"
 role = "Executable production integration"
 use_when = "Review tested trust boundaries and deployment choices before shipping."
 repository = "https://github.com/hayatepy/golden-app"
-source_commit = "a424e1417baa2830518ce696bb96130f34c90259"
+source_commit = "842fd2486f3d8bd5c284e44e4f8528b0441a574a"
diff --git a/docs/ecosystem/compose.md b/docs/ecosystem/compose.md
index ef0a1c6..461491b 100644
--- a/docs/ecosystem/compose.md
+++ b/docs/ecosystem/compose.md
@@ -25,7 +25,20 @@ uv add hayate hayate-openapi
 ```
 
 Use explicit `Annotated` request sources and return types to drive runtime
-binding, validation, JSON serialization, OpenAPI 3.1, and TypeScript types.
+binding, validation, JSON serialization, OpenAPI 3.1, TypeScript types, and a
+callable Fetch client.
+
+## Typed client boundary
+
+`hayate-openapi` emits `api-types.ts` and a status-discriminated
+`api-client.ts` from the same OpenAPI 3.1.1 document. The generated client
+uses the platform `fetch`, `URL`, `Headers`, `FormData`, and `Blob` APIs, so it
+has no runtime npm dependency. Path, query, header, cookie, JSON,
+URL-encoded, and multipart inputs stay tied to the published schema.
+
+The [golden application executes the compiled client against a real ASGI
+process](https://github.com/hayatepy/golden-app/blob/842fd2486f3d8bd5c284e44e4f8528b0441a574a/client/check-api-client.ts)
+instead of treating generation or type-checking alone as interoperability.
 
 ## Server-rendered application
 
@@ -49,7 +62,7 @@ customer workflows.
 them:
 
 ```sh
-uvx --from create-hayate==0.12.0 create-hayate --help
+uvx --from create-hayate==0.13.0 create-hayate --help
 ```
 
 Use the [family map](index.md) for current release state and package links.
diff --git a/docs/ecosystem/index.md b/docs/ecosystem/index.md
index bbe01d2..311e39f 100644
--- a/docs/ecosystem/index.md
+++ b/docs/ecosystem/index.md
@@ -4,36 +4,36 @@
 
 Choose packages by the boundary your application needs. The core stays small; capabilities are explicit packages with their own release and evidence.
 
-This snapshot is dated **2026-07-30** and is pinned to [`hayatepy/.github` at `0b44120a8e73`](https://github.com/hayatepy/.github/tree/0b44120a8e73d45fcfdfc1ce879faf5cd3452243). Every package is pre-1.0; check the compatibility snapshot before combining versions.
+This snapshot is dated **2026-07-30** and is pinned to [`hayatepy/.github` at `975173da2c1b`](https://github.com/hayatepy/.github/tree/975173da2c1be720a4f902cde36ba3822b9b6e56). Every package is pre-1.0; check the compatibility snapshot before combining versions.
 
 | Project | Version | Responsibility | Release state |
 |---|---:|---|---|
-| [`hayate`](https://github.com/hayatepy/hayate) | [`0.15.1`](https://pypi.org/project/hayate/) | Core framework and native runtime adapters | Published alpha |
-| [`create-hayate`](https://github.com/hayatepy/create-hayate) | [`0.12.0`](https://pypi.org/project/create-hayate/) | Composable project generator | Published alpha |
+| [`hayate`](https://github.com/hayatepy/hayate) | [`0.15.1`](https://pypi.org/project/hayate/) | Core framework and native ASGI, Workers, and Lambda adapters | Published alpha |
+| [`create-hayate`](https://github.com/hayatepy/create-hayate) | [`0.13.0`](https://pypi.org/project/create-hayate/) | Composable applications with drift-checked first-party TypeScript clients | Published alpha |
 | [`hayate-auth`](https://github.com/hayatepy/hayate-auth) | [`0.10.1`](https://pypi.org/project/hayate-auth/) | Sessions, API keys, OAuth, passkeys, and authorization server | Published alpha; independent audit pending |
 | [`hayate-mcp`](https://github.com/hayatepy/hayate-mcp) | [`0.12.0`](https://pypi.org/project/hayate-mcp/) | MCP 2026-07-28 Streamable HTTP and discovery | Published alpha |
-| [`hayate-openapi`](https://github.com/hayatepy/hayate-openapi) | [`0.7.0`](https://pypi.org/project/hayate-openapi/) | OpenAPI 3.1, typed endpoints, Scalar, and TypeScript contracts | Published alpha |
+| [`hayate-openapi`](https://github.com/hayatepy/hayate-openapi) | [`0.8.1`](https://pypi.org/project/hayate-openapi/) | OpenAPI 3.1, Scalar, and generated zero-runtime TypeScript clients | Published alpha |
 | [`hayate-sql`](https://github.com/hayatepy/hayate-sql) | [`0.1.1`](https://pypi.org/project/hayate-sql/) | Checked SQL contracts and typed query facades | Published alpha |
 | [`hayate-fetch`](https://github.com/hayatepy/hayate-fetch) | [`0.1.3`](https://pypi.org/project/hayate-fetch/) | Portable outbound WHATWG-style fetch | Published alpha |
 | [`hayate-admin`](https://github.com/hayatepy/hayate-admin) | `0.2.0` | Explicit checked-SQL operational administration | Pre-release source |
 | [`hayate-htmx`](https://github.com/hayatepy/hayate-htmx) | `0.2.0` | Hypermedia, Jinja, htmx, fragments, and SSE | Pre-release source |
 | [`golden-app`](https://github.com/hayatepy/golden-app) | `0.1.0` | Executable production integration | Reference application |
 
-[Open the tested compatibility snapshot](https://github.com/hayatepy/.github/blob/0b44120a8e73d45fcfdfc1ce879faf5cd3452243/docs/COMPATIBILITY.md)
+[Open the tested compatibility snapshot](https://github.com/hayatepy/.github/blob/975173da2c1be720a4f902cde36ba3822b9b6e56/docs/COMPATIBILITY.md)
 
 ## hayate
 
 Build one Fetch-style Python application for ASGI, Workers, or Lambda.
 
-**Current evidence:** Published alpha, version `0.15.1` · [source at `9e27b0191c7f`](https://github.com/hayatepy/hayate/tree/9e27b0191c7fa9f920ad6fe5b126e190268afba2)
+**Current evidence:** Published alpha, version `0.15.1` · [source at `5592276315c9`](https://github.com/hayatepy/hayate/tree/5592276315c9b75e736d3fc204b4900e15f8867a)
 
 [Repository](https://github.com/hayatepy/hayate) · [PyPI](https://pypi.org/project/hayate/)
 
 ## create-hayate
 
-Start with a tested API, Workers, MCP, auth, SQL, admin, or frontend composition.
+Start with a tested API, Workers, MCP, auth, SQL, admin, or frontend composition and keep its generated client in sync.
 
-**Current evidence:** Published alpha, version `0.12.0` · [source at `a1974325ce62`](https://github.com/hayatepy/create-hayate/tree/a1974325ce62a4bce5c6ceab27211675e07b0001)
+**Current evidence:** Published alpha, version `0.13.0` · [source at `9fdb98e5642f`](https://github.com/hayatepy/create-hayate/tree/9fdb98e5642ff047e04e24251be1c2747fc7572a)
 
 [Repository](https://github.com/hayatepy/create-hayate) · [PyPI](https://pypi.org/project/create-hayate/)
 
@@ -55,9 +55,9 @@ Expose MCP tools on ASGI or native Cloudflare Workers.
 
 ## hayate-openapi
 
-Make runtime validation, API documentation, and client types share one contract.
+Make runtime validation, API documentation, client types, and a callable Fetch client share one contract.
 
-**Current evidence:** Published alpha, version `0.7.0` · [source at `5d274a7cc337`](https://github.com/hayatepy/hayate-openapi/tree/5d274a7cc337c3336d5316421691779504e592f7)
+**Current evidence:** Published alpha, version `0.8.1` · [source at `2ed34215ec3d`](https://github.com/hayatepy/hayate-openapi/tree/2ed34215ec3dd5ebd0a0780f7b7903f0b3492a78)
 
 [Repository](https://github.com/hayatepy/hayate-openapi) · [PyPI](https://pypi.org/project/hayate-openapi/)
 
@@ -97,6 +97,6 @@ Build progressively enhanced server-rendered applications without a JavaScript S
 
 Review tested trust boundaries and deployment choices before shipping.
 
-**Current evidence:** Reference application, version `0.1.0` · [source at `a424e1417baa`](https://github.com/hayatepy/golden-app/tree/a424e1417baa2830518ce696bb96130f34c90259)
+**Current evidence:** Reference application, version `0.1.0` · [source at `842fd2486f3d`](https://github.com/hayatepy/golden-app/tree/842fd2486f3d8bd5c284e44e4f8528b0441a574a)
 
 [Repository](https://github.com/hayatepy/golden-app)
diff --git a/docs/evidence/compatibility.md b/docs/evidence/compatibility.md
index 042644f..d237051 100644
--- a/docs/evidence/compatibility.md
+++ b/docs/evidence/compatibility.md
@@ -4,7 +4,7 @@ The current public snapshot is dated **2026-07-30**. All packages remain
 pre-1.0, so compatible versions must be selected from evidence rather than
 assumed from package names.
 
-[Open the immutable compatibility snapshot](https://github.com/hayatepy/.github/blob/0b44120a8e73d45fcfdfc1ce879faf5cd3452243/docs/COMPATIBILITY.md){ .md-button .md-button--primary }
+[Open the immutable compatibility snapshot](https://github.com/hayatepy/.github/blob/975173da2c1be720a4f902cde36ba3822b9b6e56/docs/COMPATIBILITY.md){ .md-button .md-button--primary }
 
 ## Golden runtime lock
 
@@ -19,5 +19,20 @@ assumed from package names.
 | Workers flags | `python_workers` |
 | Default Workers entrypoint | `WorkerEntrypoint` class |
 
+## Released client evidence
+
+- `hayate-openapi 0.8.1` generates the dependency-free callable TypeScript
+  client and validates it against a real Hayate ASGI process.
+- `create-hayate 0.13.0` propagates the client, its types, and drift checks
+  into generated projects.
+- The released generator passed all
+  [112 frontend compositions](https://github.com/hayatepy/create-hayate/actions/runs/30488857568).
+  The aggregate evidence JSON SHA-256 is
+  `fb3f4dc15e8d49bd1fdb6a658df70cc33e174a0f9342895f732dca8aa57a8bb9`.
+- The [golden application main
+  run](https://github.com/hayatepy/golden-app/actions/runs/30488723553)
+  executes authenticated path, query, JSON, multipart, delete, and error
+  flows through the compiled client.
+
 The generated [family map](../ecosystem/index.md) pins each listed project to
 the source commit used for this site snapshot.
diff --git a/docs/get-started/first-app.md b/docs/get-started/first-app.md
index 01fa73f..3f041a0 100644
--- a/docs/get-started/first-app.md
+++ b/docs/get-started/first-app.md
@@ -9,7 +9,7 @@ Cloudflare Access, checked SQL, request correlation, and production middleware.
 Install [uv](https://docs.astral.sh/uv/), then run:
 
 ```sh
-uvx --refresh --from create-hayate==0.12.0 \
+uvx --refresh --from create-hayate==0.13.0 \
   create-hayate my-app --template workers --preset production
 cd my-app
 ```
@@ -26,6 +26,10 @@ uv sync --locked
 uv run pytest
 uv run ruff check .
 uv run python scripts/check_sql_contracts.py
+sh scripts/export_api.sh
+test -f openapi.json
+test -f client/api-types.ts
+test -f client/api-client.ts
 ```
 
 Commit `uv.lock` and use `uv sync --locked` in CI. The generated `.dev.vars`
@@ -38,6 +42,9 @@ credentials.
 - Uvicorn supplies local ASGI; SQLite supplies local data.
 - Workerd supplies the native Workers adapter; D1 is a runtime binding.
 - HTTP and MCP share request identity and checked storage.
+- `client/api-types.ts` and the callable `client/api-client.ts` come from the
+  same OpenAPI document. The client uses platform Fetch APIs and adds no
+  runtime package dependency.
 - The default Workers export is a `WorkerEntrypoint` class, preserving named
   RPC and class handlers such as `scheduled`.
 
diff --git a/docs/index.md b/docs/index.md
index 28ba636..7eaaf9f 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -83,7 +83,8 @@ description: One Fetch-style Python application across ASGI, Cloudflare Workers,
   <p>
     The published baseline records startup, dependencies, payload, throughput,
     and a shared HTTP contract. Compatibility is backed by real ASGI,
-    Workerd/D1, and downstream package runs.
+    Workerd/D1, downstream package runs, and a generated zero-runtime
+    TypeScript client executed against real ASGI.
   </p>
   <a class="md-button" href="evidence/">Read the evidence</a>
 </section>
@@ -91,6 +92,6 @@ description: One Fetch-style Python application across ASGI, Cloudflare Workers,
 <section class="hayate-final">
   <p class="hayate-kicker">START FROM A TESTED COMPOSITION</p>
   <h2>From empty directory to passing production checks.</h2>
-  <p><code>uvx --from create-hayate==0.12.0 create-hayate my-app --template workers --preset production</code></p>
+  <p><code>uvx --from create-hayate==0.13.0 create-hayate my-app --template workers --preset production</code></p>
   <a class="md-button md-button--primary" href="get-started/first-app/">Follow the verified path</a>
 </section>