diff --git a/.github/scripts/codegen-check.sh b/.github/scripts/codegen-check.sh
index 6bf43e0..d69152e 100644
--- a/.github/scripts/codegen-check.sh
+++ b/.github/scripts/codegen-check.sh
@@ -2,12 +2,12 @@
 #
 # CI artifact — not part of the SDK.
 #
-# Renders the .trix/client-lib codegen plugin against the shared transfer
+# Renders tx3c's built-in `python-client` template against the shared transfer
 # fixture and verifies the result the way a consumer would: the rendered module
 # is imported in a fresh venv with the dependencies its generated
 # requirements.txt pins installed — no editable install of the SDK source tree.
 #
-# Requires `tx3c` and `python` on PATH.
+# Requires `tx3c` (0.24.0 or later, which ships the built-in templates) and `python` on PATH.
 # Last verified against fleet v0.12.0 (unified Tx3ClientBuilder).
 set -euo pipefail
 
@@ -17,7 +17,7 @@ trap 'rm -rf "$gen"' EXIT
 
 tx3c codegen \
   --tii "$repo_root/sdk/tests/fixtures/transfer.tii" \
-  --template "$repo_root/.trix/client-lib" \
+  --template python-client \
   --output "$gen"
 
 for f in __init__.py requirements.txt; do
diff --git a/.trix/client-lib/README.md.hbs b/.trix/client-lib/README.md.hbs
deleted file mode 100644
index 2082b95..0000000
--- a/.trix/client-lib/README.md.hbs
+++ /dev/null
@@ -1,27 +0,0 @@
-# {{tii.protocol.name}} — Python client
-
-Generated by `trix codegen` from the `{{tii.protocol.name}}@{{tii.protocol.version}}` protocol interface. Do not edit by hand — re-run `trix codegen` to refresh.
-
-## Install the runtime SDK
-
-The generated client delegates transport, signing, and lifecycle to `tx3-sdk`:
-
-```sh
-pip install tx3-sdk
-```
-
-If you also need a local dev runtime, `trix devnet` exposes a TRP endpoint at `http://localhost:8164`.
-
-## Use the client
-
-```python
-from tx3_sdk import ClientOptions, Party
-from {{tii.protocol.name}} import Client, Profile
-
-client = Client(
-    ClientOptions(endpoint="http://localhost:8164"),
-    Profile.LOCAL,
-)
-```
-
-Each `tx` declared by the protocol becomes a typed method on `client`, returning the `resolve → sign → submit → wait` lifecycle. See the [Tx3 consuming guide](https://docs.txpipe.io/tx3/consuming/quick-start) for the full walkthrough.
diff --git a/.trix/client-lib/__init__.py.hbs b/.trix/client-lib/__init__.py.hbs
deleted file mode 100644
index f25934c..0000000
--- a/.trix/client-lib/__init__.py.hbs
+++ /dev/null
@@ -1,132 +0,0 @@
-# This file is auto-generated by trix codegen.
-# Target TII version: {{tii.tii.version}}
-
-from __future__ import annotations
-
-import json
-from dataclasses import dataclass
-from enum import Enum
-from typing import Any
-
-from tx3_sdk import (
-    Party,
-    Profile as SdkProfile,
-    Tx3Client,
-    Tx3ClientBuilder,
-)
-from tx3_sdk.core.bytes import TirEnvelope
-from tx3_sdk.facade.builder import TxBuilder
-from tx3_sdk.trp.client import ClientOptions
-
-PROTOCOL_NAME = "{{tii.protocol.name}}"
-PROTOCOL_VERSION = "{{tii.protocol.version}}"
-TARGET_TII_VERSION = "{{tii.tii.version}}"
-
-{{#if tii.environment}}
-# JSON Schema of the protocol environment, embedded verbatim from the TII.
-ENVIRONMENT_SCHEMA: dict[str, Any] = json.loads(
-    """{{{json tii.environment}}}"""
-)
-
-{{/if}}
-{{#if tii.components.schemas}}
-# Named types for the protocol's custom (record / variant) types.
-{{{componentTypes tii.components.schemas "python"}}}
-
-{{/if}}
-{{#each tii.transactions}}
-{{constantCase @key}}_TIR = TirEnvelope(
-    content="{{tir.content}}",
-    encoding="{{tir.encoding}}",
-    version="{{tir.version}}",
-)
-
-@dataclass
-class {{pascalCase @key}}Params:
-    """Arguments for the {{@key}} transaction."""
-
-{{#each params.properties}}
-    {{snakeCase @key}}: {{schemaTypeFor this "python"}}
-{{/each}}
-
-
-{{/each}}
-{{#if tii.profiles}}
-{{#each tii.profiles}}
-_{{constantCase @key}}_PROFILE = SdkProfile(
-    environment=json.loads("""{{{json this.environment}}}"""),
-    parties=json.loads("""{{{json this.parties}}}"""),
-)
-{{/each}}
-
-
-class Profile(str, Enum):
-    """Profiles declared by the protocol. Required argument to `Client`."""
-
-{{#each tii.profiles}}
-    {{constantCase @key}} = "{{@key}}"
-{{/each}}
-
-
-{{/if}}
-class Client:
-    """Typed protocol client exposing the full transaction lifecycle.
-
-    Wraps the runtime SDK's `Tx3Client` — all lifecycle state, party storage,
-    resolve/sign/submit/wait, and error handling live in the SDK. This wrapper
-    only adds the typed shape of per-transaction methods, per-party setters,
-    and the embedded protocol fragments.
-    """
-
-    def __init__(
-        self,
-        options: ClientOptions,
-{{#if tii.profiles}}
-        profile: Profile,
-{{/if}}
-    ) -> None:
-        transactions: dict[str, TirEnvelope] = {
-{{#each tii.transactions}}
-            "{{@key}}": {{constantCase @key}}_TIR,
-{{/each}}
-        }
-{{#if tii.profiles}}
-        profiles: dict[str, SdkProfile] = {
-{{#each tii.profiles}}
-            "{{@key}}": _{{constantCase @key}}_PROFILE,
-{{/each}}
-        }
-{{else}}
-        profiles: dict[str, SdkProfile] = {}
-{{/if}}
-
-        builder = Tx3ClientBuilder.from_parts(transactions, profiles, [])
-        builder = builder.trp(options)
-{{#if tii.profiles}}
-        builder = builder.with_profile(profile.value)
-{{/if}}
-        self._inner: Tx3Client = builder.build()
-
-{{#each tii.parties}}
-    def with_{{snakeCase @key}}(self, party: Party) -> "Client":
-        """Binds the `{{@key}}` party. Overrides any address declared for that
-        party by the selected profile.
-        """
-        self._inner = self._inner.with_party_unchecked("{{@key}}", party)
-        return self
-
-{{/each}}
-{{#each tii.transactions}}
-    def {{snakeCase @key}}(self, args: {{pascalCase @key}}Params) -> TxBuilder:
-        """Builds the `{{@key}}` transaction. Drive the returned builder with
-        `.resolve()` and the rest of the lifecycle chain.
-        """
-        return self._inner.tx("{{@key}}").args(
-            {
-{{#each params.properties}}
-                "{{@key}}": args.{{snakeCase @key}},
-{{/each}}
-            }
-        )
-
-{{/each}}
diff --git a/.trix/client-lib/requirements.txt.hbs b/.trix/client-lib/requirements.txt.hbs
deleted file mode 100644
index e42e07b..0000000
--- a/.trix/client-lib/requirements.txt.hbs
+++ /dev/null
@@ -1,9 +0,0 @@
-anyio==4.9.0
-certifi==2025.4.26
-h11==0.16.0
-httpcore==1.0.9
-httpx==0.28.1
-idna==3.10
-sniffio==1.3.1
-
-tx3-sdk>=0.15.0,<0.16.0