diff --git a/.env.example b/.env.example
index 283ccc6..473dae0 100644
--- a/.env.example
+++ b/.env.example
@@ -4,7 +4,13 @@ OPENROUTER_API_KEY=
 # Optional: API key required when the control plane enforces auth
 AGENTFIELD_API_KEY=
 
-# Optional model/provider overrides
-HARNESS_PROVIDER=opencode
+# AForge exec is the default. Set HARNESS_PROVIDER=opencode to roll back —
+# OpenCode stays installed in the image.
+HARNESS_PROVIDER=aforge
+# Which aforge subcommand the SDK runs: `exec` (default, direct one-shot) or
+# `do` (routed workflow). Honoured by agentfield >= 0.1.130.
+AGENTFIELD_AFORGE_COMMAND=exec
+# Override which aforge binary runs (honoured today via HarnessConfig.aforge_bin).
+# CONTRACT_AF_AFORGE_BIN=/absolute/path/to/aforge
 HARNESS_MODEL=openrouter/moonshotai/kimi-k2.5
 AI_MODEL=openrouter/moonshotai/kimi-k2.5
diff --git a/Dockerfile b/Dockerfile
index 17b87d6..4d8890c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,3 +1,40 @@
+# AForge CLI — fetched from the public release mirror and verified against the
+# release checksums (which hash the *uncompressed* binaries). Both ARGs are
+# overridable so CI or a local mirror can serve the same layout elsewhere:
+#   docker build --build-arg AFORGE_BASE_URL=... --build-arg AFORGE_VERSION=... .
+ARG AFORGE_BASE_URL=https://agentfield.ai/downloads/aforge
+ARG AFORGE_VERSION=v0.1.0
+
+# Reuses the python:3.11-slim base (debian bookworm) already pulled for the
+# builder/runtime stages rather than adding a second base image to the build.
+FROM python:3.11-slim AS aforge
+
+ARG AFORGE_BASE_URL
+ARG AFORGE_VERSION
+# TARGETARCH is populated by BuildKit; dpkg is the fallback for the legacy
+# builder, where the build platform is always the target platform.
+ARG TARGETARCH
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ca-certificates \
+    curl && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /out
+
+RUN set -eu; \
+    arch="${TARGETARCH:-$(dpkg --print-architecture)}"; \
+    curl -fsSL "${AFORGE_BASE_URL}/${AFORGE_VERSION}/aforge-linux-${arch}.gz" -o aforge.gz; \
+    gunzip -c aforge.gz > aforge; \
+    rm aforge.gz; \
+    curl -fsSL "${AFORGE_BASE_URL}/${AFORGE_VERSION}/checksums.txt" -o checksums.txt; \
+    grep " aforge-linux-${arch}$" checksums.txt \
+      | sed "s/  aforge-linux-.*/  aforge/" \
+      | sha256sum -c -; \
+    rm checksums.txt; \
+    chmod +x aforge
+
+
 FROM python:3.11-slim AS builder
 
 ENV PYTHONDONTWRITEBYTECODE=1 \
@@ -14,7 +51,7 @@ COPY pyproject.toml README.md ./
 COPY src/ src/
 
 RUN pip install --no-cache-dir --prefix=/install \
-    "agentfield>=0.1.47" \
+    "agentfield>=0.1.130" \
     "pydantic>=2.0" \
     "httpx>=0.27" \
     "python-dotenv>=1.0" \
@@ -28,7 +65,8 @@ FROM python:3.11-slim AS runtime
 ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \
     AGENTFIELD_SERVER=http://agentfield:8080 \
-    HARNESS_PROVIDER=opencode \
+    HARNESS_PROVIDER=aforge \
+    AGENTFIELD_AFORGE_COMMAND=exec \
     HARNESS_MODEL=openrouter/moonshotai/kimi-k2.5 \
     AI_MODEL=openrouter/moonshotai/kimi-k2.5 \
     PORT=8004 \
@@ -54,6 +92,7 @@ RUN mkdir -p /home/contractaf/.config/opencode && \
     chown -R contractaf:contractaf /home/contractaf/.config
 
 COPY --from=builder /install /usr/local
+COPY --from=aforge /out/aforge /usr/local/bin/aforge
 COPY src/ /app/src/
 
 USER contractaf
diff --git a/README.md b/README.md
index 16e0462..a4abe34 100644
--- a/README.md
+++ b/README.md
@@ -146,6 +146,12 @@ docker compose up --build
 
 Starts AgentField control plane (`http://localhost:8080`) + Contract-AF agent.
 
+AForge `exec` is the default coding harness. The image fetches the released
+`aforge` binary from `https://agentfield.ai/downloads/aforge` at build time and
+verifies it against the release checksums. OpenCode stays installed as the
+configuration-only rollback: set `HARNESS_PROVIDER=opencode`. Point
+`CONTRACT_AF_AFORGE_BIN` at another binary to override which `aforge` runs.
+
 ```bash
 curl -X POST http://localhost:8080/api/v1/execute/async/contract-af.analyze \
   -H "Content-Type: application/json" \
diff --git a/agentfield-package.yaml b/agentfield-package.yaml
new file mode 100644
index 0000000..c249bb9
--- /dev/null
+++ b/agentfield-package.yaml
@@ -0,0 +1,58 @@
+config_version: v1            # manifest schema version (omit = legacy v0)
+name: contract-af
+version: 0.1.0
+description: AI-native legal contract risk analyzer — finds dangerous clauses, proves exploitability
+author: Agent-Field
+
+entrypoint:
+  start: python -m contract_af.app
+  healthcheck: /health
+
+agent_node:
+  node_id: contract-af
+  default_port: 8004
+
+dependencies:
+  system:
+    # `af install` builds a Python venv; it does not fetch harness CLIs (the
+    # Docker image does). Printed as a manual step so a local install says so
+    # up front instead of failing on the first harness call.
+    - "aforge (https://agentfield.ai/downloads/aforge) — or set HARNESS_PROVIDER=opencode"
+
+user_environment:
+  required:
+    # Drives both the coding harness (AForge/OpenCode) and the .ai() reasoning
+    # calls — every phase of the pipeline needs it.
+    - name: OPENROUTER_API_KEY
+      description: LLM provider key (OpenRouter)
+      type: secret
+      scope: global
+  optional:
+    - name: AGENTFIELD_SERVER
+      description: Control-plane URL
+      default: http://localhost:8080
+    - name: AGENTFIELD_API_KEY
+      description: Control-plane API key (if auth is enabled)
+      type: secret
+      scope: global
+    - name: NODE_ID
+      description: Identity this node registers under
+      default: contract-af
+    # AForge is the default harness. OpenCode stays installed as the
+    # configuration-only rollback: set this to `opencode`.
+    - name: HARNESS_PROVIDER
+      description: Coding-agent harness provider (aforge | opencode)
+      default: aforge
+    - name: HARNESS_MODEL
+      description: Model the coding harness uses
+      default: openrouter/moonshotai/kimi-k2.5
+    - name: AI_MODEL
+      description: Model the .ai() reasoning calls use
+      default: openrouter/moonshotai/kimi-k2.5
+    - name: CONTRACT_AF_AFORGE_BIN
+      description: Path to the aforge binary (defaults to `aforge` on PATH)
+    - name: CONTRACT_AF_OPENCODE_BIN
+      description: Path to the opencode binary (defaults to `opencode` on PATH)
+    - name: CONTRACT_AF_MAX_TURNS
+      description: Maximum harness iterations per call
+      default: "50"
diff --git a/docker-compose.yml b/docker-compose.yml
index 0061a07..fb930d5 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -22,7 +22,8 @@ services:
       - AGENTFIELD_SERVER=http://agentfield:8080
       - AGENTFIELD_API_KEY=${AGENTFIELD_API_KEY:-}
       - AGENT_CALLBACK_URL=http://contract-af:8004
-      - HARNESS_PROVIDER=opencode
+      - HARNESS_PROVIDER=${HARNESS_PROVIDER:-aforge}
+      - AGENTFIELD_AFORGE_COMMAND=${AGENTFIELD_AFORGE_COMMAND:-exec}
       - HARNESS_MODEL=${HARNESS_MODEL:-openrouter/moonshotai/kimi-k2.5}
       - AI_MODEL=${AI_MODEL:-openrouter/moonshotai/kimi-k2.5}
       - OPENROUTER_API_KEY=${OPENROUTER_API_KEY}
diff --git a/pyproject.toml b/pyproject.toml
index a8415cc..9bde38d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,7 +8,7 @@ version = "0.1.0"
 description = "Legal contract risk analyzer — finds dangerous clauses, proves exploitability"
 requires-python = ">=3.10"
 dependencies = [
-    "agentfield",
+    "agentfield>=0.1.130",
     "pydantic>=2.0",
     "fastapi>=0.100",
     "uvicorn>=0.20",
diff --git a/src/contract_af/app.py b/src/contract_af/app.py
index b6b1626..acbf007 100644
--- a/src/contract_af/app.py
+++ b/src/contract_af/app.py
@@ -44,6 +44,7 @@
         max_turns=_ai_config.max_turns,
         env=_ai_config.provider_env(),
         opencode_bin=_ai_config.opencode_bin,
+        aforge_bin=_ai_config.aforge_bin,
         permission_mode="auto",
     ),
     ai_config=AIConfig(
diff --git a/src/contract_af/config.py b/src/contract_af/config.py
index 7a719e4..65a0dbc 100644
--- a/src/contract_af/config.py
+++ b/src/contract_af/config.py
@@ -9,7 +9,7 @@
 class AIIntegrationConfig(BaseModel):
     provider: str = Field(
         default_factory=lambda: os.getenv(
-            "CONTRACT_AF_PROVIDER", os.getenv("HARNESS_PROVIDER", "opencode")
+            "CONTRACT_AF_PROVIDER", os.getenv("HARNESS_PROVIDER", "aforge")
         )
     )
     harness_model: str = Field(
@@ -33,6 +33,11 @@ class AIIntegrationConfig(BaseModel):
     opencode_bin: str = Field(
         default_factory=lambda: os.getenv("CONTRACT_AF_OPENCODE_BIN", "opencode")
     )
+    aforge_bin: str = Field(
+        default_factory=lambda: os.getenv(
+            "CONTRACT_AF_AFORGE_BIN", os.getenv("AFORGE_BIN", "aforge")
+        )
+    )
     opencode_server: str | None = Field(
         default_factory=lambda: os.getenv(
             "CONTRACT_AF_OPENCODE_SERVER", os.getenv("OPENCODE_SERVER")
@@ -53,6 +58,9 @@ def provider_env(self) -> dict[str, str]:
         env: dict[str, str] = {
             key: value for key in env_keys if (value := os.getenv(key))
         }
+        env["AGENTFIELD_AFORGE_COMMAND"] = os.getenv(
+            "AGENTFIELD_AFORGE_COMMAND", "exec"
+        )
         xdg = os.getenv("XDG_DATA_HOME") or os.path.join(
             tempfile.gettempdir(), "opencode-shared-data"
         )
diff --git a/tests/test_config.py b/tests/test_config.py
new file mode 100644
index 0000000..7f90617
--- /dev/null
+++ b/tests/test_config.py
@@ -0,0 +1,49 @@
+from __future__ import annotations
+
+import pytest
+
+from contract_af.config import AIIntegrationConfig
+
+
+def test_aforge_exec_is_the_default_harness(monkeypatch: pytest.MonkeyPatch) -> None:
+    for key in (
+        "CONTRACT_AF_PROVIDER",
+        "HARNESS_PROVIDER",
+        "CONTRACT_AF_AFORGE_BIN",
+        "AFORGE_BIN",
+        "AGENTFIELD_AFORGE_COMMAND",
+    ):
+        monkeypatch.delenv(key, raising=False)
+
+    config = AIIntegrationConfig.from_env()
+
+    assert config.provider == "aforge"
+    assert config.aforge_bin == "aforge"
+    assert config.provider_env()["AGENTFIELD_AFORGE_COMMAND"] == "exec"
+
+
+def test_opencode_remains_an_explicit_rollback(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setenv("HARNESS_PROVIDER", "opencode")
+
+    assert AIIntegrationConfig.from_env().provider == "opencode"
+
+
+def test_aforge_bin_override_precedence(monkeypatch: pytest.MonkeyPatch) -> None:
+    """CONTRACT_AF_AFORGE_BIN wins over AFORGE_BIN, which wins over the default."""
+    monkeypatch.delenv("CONTRACT_AF_AFORGE_BIN", raising=False)
+    monkeypatch.setenv("AFORGE_BIN", "/opt/aforge/aforge")
+
+    assert AIIntegrationConfig.from_env().aforge_bin == "/opt/aforge/aforge"
+
+    monkeypatch.setenv("CONTRACT_AF_AFORGE_BIN", "/usr/local/bin/aforge")
+
+    assert AIIntegrationConfig.from_env().aforge_bin == "/usr/local/bin/aforge"
+
+
+def test_provider_env_forwards_provider_keys(monkeypatch: pytest.MonkeyPatch) -> None:
+    """Harness subprocess env carries the LLM key AForge needs to reach OpenRouter."""
+    monkeypatch.setenv("OPENROUTER_API_KEY", "sk-test-key")
+
+    env = AIIntegrationConfig.from_env().provider_env()
+
+    assert env["OPENROUTER_API_KEY"] == "sk-test-key"