diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 6f82a975..da7f17b7 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -222,7 +222,7 @@ jobs:
   # token). Migrate to project-scoped tokens once the projects exist on PyPI.
   #
   # Sequenced via `needs:` because darnit-baseline, darnit-gittuf,
-  # darnit-reproducibility, and darnit-mcp declare `darnit-core>=...` runtime
+  # darnit-amber, and darnit-mcp declare `darnit-core>=...` runtime
   # deps; darnit-mcp additionally depends on the other four. Publishing them
   # before the deps are on the index briefly produces unresolvable wheels.
 
@@ -289,8 +289,8 @@ jobs:
           password: ${{ secrets.PYPI_API_TOKEN }}
           skip-existing: true
 
-  publish-darnit-reproducibility:
-    name: Publish darnit-reproducibility to PyPI
+  publish-darnit-amber:
+    name: Publish darnit-amber to PyPI
     needs: [preflight, build, publish-darnit-core]
     runs-on: ubuntu-latest
     timeout-minutes: 10
@@ -303,10 +303,10 @@ jobs:
           name: dist
           path: dist/
 
-      - name: Publish darnit-reproducibility
+      - name: Publish darnit-amber
         uses: pypa/gh-action-pypi-publish@dc37677b2e1c63e2034f94d8a5b11f265b73ba33 # release/v1
         with:
-          packages-dir: dist/darnit-reproducibility/
+          packages-dir: dist/darnit-amber/
           password: ${{ secrets.PYPI_API_TOKEN }}
           skip-existing: true
 
@@ -317,7 +317,7 @@ jobs:
       - build
       - publish-darnit-baseline
       - publish-darnit-gittuf
-      - publish-darnit-reproducibility
+      - publish-darnit-amber
     runs-on: ubuntu-latest
     timeout-minutes: 10
     permissions:
@@ -482,7 +482,7 @@ jobs:
           ## Install
 
           - **MCP (Claude Code / Claude Desktop):** \`darnit install\` writes an \`uvx --from darnit-mcp\` config for you. See [docs/install/](https://github.com/${GITHUB_REPOSITORY}/tree/${TAG}/docs/install).
-          - **PyPI:** \`pip install darnit-mcp==${VERSION}\` (installs the meta-package plus \`darnit-core\`, \`darnit-baseline\`, \`darnit-gittuf\`, \`darnit-reproducibility\`).
+          - **PyPI:** \`pip install darnit-mcp==${VERSION}\` (installs the meta-package plus \`darnit-core\`, \`darnit-baseline\`, \`darnit-gittuf\`, \`darnit-amber\`).
           - **Container:** \`docker pull ghcr.io/${owner_lc}/darnit:${TAG}\`.
           - **Standalone binary / Homebrew:** not yet in this release. Tracked for follow-ups.
 
@@ -512,7 +512,7 @@ jobs:
       - publish-darnit-core
       - publish-darnit-baseline
       - publish-darnit-gittuf
-      - publish-darnit-reproducibility
+      - publish-darnit-amber
       - publish-darnit-mcp
       - container_build_push
       - release
@@ -527,7 +527,7 @@ jobs:
           PYPI_CORE: ${{ needs.publish-darnit-core.result }}
           PYPI_BASELINE: ${{ needs.publish-darnit-baseline.result }}
           PYPI_GITTUF: ${{ needs.publish-darnit-gittuf.result }}
-          PYPI_REPRO: ${{ needs.publish-darnit-reproducibility.result }}
+          PYPI_REPRO: ${{ needs.publish-darnit-amber.result }}
           PYPI_MCP: ${{ needs.publish-darnit-mcp.result }}
           CONTAINER: ${{ needs.container_build_push.result }}
           RELEASE: ${{ needs.release.result }}
@@ -540,7 +540,7 @@ jobs:
             echo "| pypi-darnit-core | $PYPI_CORE |"
             echo "| pypi-darnit-baseline | $PYPI_BASELINE |"
             echo "| pypi-darnit-gittuf | $PYPI_GITTUF |"
-            echo "| pypi-darnit-reproducibility | $PYPI_REPRO |"
+            echo "| pypi-darnit-amber | $PYPI_REPRO |"
             echo "| pypi-darnit-mcp | $PYPI_MCP |"
             echo "| container | $CONTAINER |"
             echo "| github-release | $RELEASE |"
diff --git a/CLAUDE.md b/CLAUDE.md
index afcf9dd9..b9cd0321 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -142,7 +142,7 @@ my-framework = "my_framework:register"
 
 ### Framework config resolution (feature 021)
 
-`get_framework_config_path()` MUST use `importlib.resources.files(__package__) / "<framework>.toml"` -- never `Path(__file__).parent.parent...`. The framework TOML MUST live INSIDE `src/<module>/` (alongside `implementation.py`), not sibling to `src/`, so hatchling's default `packages = ["src/<module>"]` includes it in the wheel and `importlib.resources` finds it under both editable and wheel installs. See `packages/darnit-baseline`, `packages/darnit-gittuf`, `packages/darnit-reproducibility` for reference layouts; `packages/darnit-hello` is the minimal template.
+`get_framework_config_path()` MUST use `importlib.resources.files(__package__) / "<framework>.toml"` -- never `Path(__file__).parent.parent...`. The framework TOML MUST live INSIDE `src/<module>/` (alongside `implementation.py`), not sibling to `src/`, so hatchling's default `packages = ["src/<module>"]` includes it in the wheel and `importlib.resources` finds it under both editable and wheel installs. See `packages/darnit-baseline`, `packages/darnit-gittuf`, `packages/darnit-amber` for reference layouts; `packages/darnit-hello` is the minimal template.
 
 ## Sieve Pattern
 
@@ -365,7 +365,7 @@ else:
 ## Active Technologies
 - Python 3.11/3.12 (workspace targets) plus bash for release scripts and GitHub Actions YAML + `shiv` (binary builder), `cosign` (image + binary signing), `syft` (SBOM generation), `docker buildx` (multi-arch images), `gh` CLI (release creation), Sigstore-action (PyPI wheel signing via `pypa/gh-action-pypi-publish`). No new runtime dependencies in any darnit Python package. (012-packaging-distribution)
 - External release surfaces only — PyPI, TestPyPI, GHCR, GitHub Releases (binary assets + attestations), `kusari-oss/homebrew-tap` repo (formula). Repo itself stores only build configs and workflow definitions. (012-packaging-distribution)
-- Python 3.11/3.12 (workspace targets — same as the rest of darnit) + `pydantic >= 2.0` (already used for `FrameworkConfig`); `packaging` for PEP 440 `SpecifierSet` (declared by `darnit-reproducibility` as of feature 037; darnit-core imports it at runtime without declaring it, which is tracked separately). `tomllib` from stdlib for TOML parsing. No new runtime dependencies. (013-plugin-composition)
+- Python 3.11/3.12 (workspace targets — same as the rest of darnit) + `pydantic >= 2.0` (already used for `FrameworkConfig`); `packaging` for PEP 440 `SpecifierSet` (declared by `darnit-amber` as of feature 037; darnit-core imports it at runtime without declaring it, which is tracked separately). `tomllib` from stdlib for TOML parsing. No new runtime dependencies. (013-plugin-composition)
 - Filesystem only. Composition is resolved in-memory at framework-config load time; no new persistent state. (013-plugin-composition)
 
 ## Recent Changes
diff --git a/docs/design/reproducibility-attestation-system.md b/docs/design/amber-attestation-system.md
similarity index 97%
rename from docs/design/reproducibility-attestation-system.md
rename to docs/design/amber-attestation-system.md
index a0a8e0ed..bd744f0d 100644
--- a/docs/design/reproducibility-attestation-system.md
+++ b/docs/design/amber-attestation-system.md
@@ -2,7 +2,7 @@
 
 ## Executive Summary
 
-This document describes a system design for **darnit-reproducibility**, an extension to the darnit compliance framework that enables automated reproducibility verification and attestation for computational research software. The system addresses a critical gap in scientific computing: the inability to reliably rebuild and re-execute research software (e.g., protein folding simulations, molecular dynamics, genomics pipelines) in deterministic ways.
+This document describes a system design for **darnit-amber**, an extension to the darnit compliance framework that enables automated reproducibility verification and attestation for computational research software. The system addresses a critical gap in scientific computing: the inability to reliably rebuild and re-execute research software (e.g., protein folding simulations, molecular dynamics, genomics pipelines) in deterministic ways.
 
 The system operates in two primary flows:
 
@@ -256,7 +256,7 @@ mutation {
     hasMetadata: {
       key: "https://darnit.dev/attestations/reproducibility/v1",
       value: "{...attestation JSON...}",
-      origin: "darnit-reproducibility",
+      origin: "darnit-amber",
       collector: "darnit"
     }
   )
@@ -514,7 +514,7 @@ witness_attestation_bundle:
 #### Ingestor Implementation
 
 ```python
-# packages/darnit-reproducibility/src/darnit_reproducibility/ingest/witness.py
+# packages/darnit-amber/src/darnit_amber/ingest/witness.py
 
 from dataclasses import dataclass
 from typing import Optional, List, Dict, Any
@@ -580,7 +580,7 @@ The Provenance Analyzer processes Witness data to understand the complete depend
 #### Analysis Pipeline
 
 ```python
-# packages/darnit-reproducibility/src/darnit_reproducibility/analysis/provenance.py
+# packages/darnit-amber/src/darnit_amber/analysis/provenance.py
 
 from dataclasses import dataclass, field
 from typing import List, Dict, Set, Optional
@@ -745,7 +745,7 @@ Generates environment definitions based on the provenance analysis.
 #### Generator Interface
 
 ```python
-# packages/darnit-reproducibility/src/darnit_reproducibility/generate/base.py
+# packages/darnit-amber/src/darnit_amber/generate/base.py
 
 from abc import ABC, abstractmethod
 from dataclasses import dataclass
@@ -784,7 +784,7 @@ class EnvironmentGenerator(ABC):
 #### Container Generator (Docker/Singularity)
 
 ```python
-# packages/darnit-reproducibility/src/darnit_reproducibility/generate/container.py
+# packages/darnit-amber/src/darnit_amber/generate/container.py
 
 class ContainerGenerator(EnvironmentGenerator):
     """Generates Dockerfile or Singularity definition files."""
@@ -842,7 +842,7 @@ class ContainerGenerator(EnvironmentGenerator):
         hardware: HardwareRequirements
     ) -> str:
         lines = [
-            f"# Auto-generated by darnit-reproducibility",
+            f"# Auto-generated by darnit-amber",
             f"# Provenance: {self._provenance_comment()}",
             f"FROM {base_image}",
             "",
@@ -904,7 +904,7 @@ class ContainerGenerator(EnvironmentGenerator):
 #### HPC Generator (Slurm/PBS)
 
 ```python
-# packages/darnit-reproducibility/src/darnit_reproducibility/generate/hpc.py
+# packages/darnit-amber/src/darnit_amber/generate/hpc.py
 
 class HPCGenerator(EnvironmentGenerator):
     """Generates HPC job scripts and environment modules."""
@@ -993,7 +993,7 @@ class HPCGenerator(EnvironmentGenerator):
 #### Nix Generator
 
 ```python
-# packages/darnit-reproducibility/src/darnit_reproducibility/generate/nix.py
+# packages/darnit-amber/src/darnit_amber/generate/nix.py
 
 class NixGenerator(EnvironmentGenerator):
     """Generates Nix derivations for maximum reproducibility."""
@@ -1031,7 +1031,7 @@ class NixGenerator(EnvironmentGenerator):
         nix_deps: List["NixPackage"]
     ) -> str:
         return f'''{{
-  description = "Reproducible environment generated by darnit-reproducibility";
+  description = "Reproducible environment generated by darnit-amber";
 
   inputs = {{
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
@@ -1086,7 +1086,7 @@ class NixGenerator(EnvironmentGenerator):
 Executes builds in generated environments with Witness tracing.
 
 ```python
-# packages/darnit-reproducibility/src/darnit_reproducibility/execute/engine.py
+# packages/darnit-amber/src/darnit_amber/execute/engine.py
 
 from dataclasses import dataclass
 from typing import Optional, List
@@ -1224,7 +1224,7 @@ class ExecutionEngine:
 Generates reproducibility attestations in in-toto format.
 
 ```python
-# packages/darnit-reproducibility/src/darnit_reproducibility/attestation/reproducibility.py
+# packages/darnit-amber/src/darnit_amber/attestation/reproducibility.py
 
 from dataclasses import dataclass, field
 from typing import List, Dict, Any, Optional
@@ -1296,7 +1296,7 @@ class ReproducibilityAttestationGenerator:
             "predicateType": predicate.predicate_type,
             "predicate": {
                 "assessor": {
-                    "name": "darnit-reproducibility",
+                    "name": "darnit-amber",
                     "version": self.config.version,
                     "timestamp": datetime.utcnow().isoformat() + "Z"
                 },
@@ -1403,7 +1403,7 @@ class ReproducibilityAttestationGenerator:
 Publishes attestations to OpenSSF GUAC.
 
 ```python
-# packages/darnit-reproducibility/src/darnit_reproducibility/publish/guac.py
+# packages/darnit-amber/src/darnit_amber/publish/guac.py
 
 from dataclasses import dataclass
 from typing import Optional, List, Dict, Any
@@ -1554,7 +1554,7 @@ class GUACPublisher:
                 "value": json.dumps(attestation["predicate"]),
                 "timestamp": attestation["predicate"]["assessor"]["timestamp"],
                 "justification": "Reproducibility attestation from darnit",
-                "origin": "darnit-reproducibility",
+                "origin": "darnit-amber",
                 "collector": "darnit"
             }
         }
@@ -1632,7 +1632,7 @@ class GUACPublisher:
 ### Tool Definitions
 
 ```python
-# packages/darnit-reproducibility/src/darnit_reproducibility/server/tools.py
+# packages/darnit-amber/src/darnit_amber/server/tools.py
 
 REPRODUCIBILITY_TOOLS = [
     {
@@ -1874,12 +1874,12 @@ reproducibility:
 ### Plugin Registration
 
 ```python
-# packages/darnit-reproducibility/src/darnit_reproducibility/__init__.py
+# packages/darnit-amber/src/darnit_amber/__init__.py
 
 from darnit.core.plugin import ComplianceImplementation
 
 def register() -> ComplianceImplementation:
-    """Register darnit-reproducibility as a compliance implementation."""
+    """Register darnit-amber as a compliance implementation."""
     return ReproducibilityImplementation()
 
 class ReproducibilityImplementation:
diff --git a/packages/darnit-reproducibility/README.md b/packages/darnit-amber/README.md
similarity index 95%
rename from packages/darnit-reproducibility/README.md
rename to packages/darnit-amber/README.md
index 318999c0..7536fdc0 100644
--- a/packages/darnit-reproducibility/README.md
+++ b/packages/darnit-amber/README.md
@@ -1,4 +1,4 @@
-# darnit-reproducibility
+# darnit-amber
 
 Scientific reproducibility checks plugin for darnit.
 
diff --git a/packages/darnit-reproducibility/pyproject.toml b/packages/darnit-amber/pyproject.toml
similarity index 75%
rename from packages/darnit-reproducibility/pyproject.toml
rename to packages/darnit-amber/pyproject.toml
index 910e760e..57ed993c 100644
--- a/packages/darnit-reproducibility/pyproject.toml
+++ b/packages/darnit-amber/pyproject.toml
@@ -1,5 +1,5 @@
 [project]
-name = "darnit-reproducibility"
+name = "darnit-amber"
 version = "0.1.0"
 description = "Scientific reproducibility checks plugin for darnit"
 readme = "README.md"
@@ -15,16 +15,16 @@ dependencies = [
 ]
 
 [project.entry-points."darnit.implementations"]
-reproducibility = "darnit_reproducibility:register"
+amber = "darnit_amber:register"
 
 [project.entry-points."darnit.frameworks"]
-reproducibility = "darnit_reproducibility:get_framework_path"
+amber = "darnit_amber:get_framework_path"
 
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"
 
 [tool.hatch.build.targets.wheel]
-packages = ["src/darnit_reproducibility"]
-# reproducibility.toml lives at src/darnit_reproducibility/reproducibility.toml
+packages = ["src/darnit_amber"]
+# amber.toml lives at src/darnit_amber/amber.toml
 # (feature 021) and is packaged automatically by the entry above.
diff --git a/packages/darnit-reproducibility/src/darnit_reproducibility/__init__.py b/packages/darnit-amber/src/darnit_amber/__init__.py
similarity index 68%
rename from packages/darnit-reproducibility/src/darnit_reproducibility/__init__.py
rename to packages/darnit-amber/src/darnit_amber/__init__.py
index 430ac7b8..213137f5 100644
--- a/packages/darnit-reproducibility/src/darnit_reproducibility/__init__.py
+++ b/packages/darnit-amber/src/darnit_amber/__init__.py
@@ -2,12 +2,12 @@
 
 from pathlib import Path
 
-from .implementation import ReproducibilityImplementation
+from .implementation import AmberImplementation
 
 
-def register() -> ReproducibilityImplementation:
+def register() -> AmberImplementation:
     """Entry point called by darnit plugin discovery."""
-    impl = ReproducibilityImplementation()
+    impl = AmberImplementation()
     impl.register_controls()
     impl.register_sieve_handlers()
     return impl
@@ -19,7 +19,7 @@ def get_framework_path() -> Path:
     # and name lookup. The 'darnit.implementations' get_framework_config_path()
     # feeds the audit path instead; both entry points are required. Delegating
     # here ensures both paths use the same importlib.resources resolver.
-    return ReproducibilityImplementation().get_framework_config_path()
+    return AmberImplementation().get_framework_config_path()
 
 
-__all__ = ["ReproducibilityImplementation", "register", "get_framework_path"]
+__all__ = ["AmberImplementation", "register", "get_framework_path"]
diff --git a/packages/darnit-reproducibility/src/darnit_reproducibility/reproducibility.toml b/packages/darnit-amber/src/darnit_amber/amber.toml
similarity index 98%
rename from packages/darnit-reproducibility/src/darnit_reproducibility/reproducibility.toml
rename to packages/darnit-amber/src/darnit_amber/amber.toml
index bc731804..8af0116a 100644
--- a/packages/darnit-reproducibility/src/darnit_reproducibility/reproducibility.toml
+++ b/packages/darnit-amber/src/darnit_amber/amber.toml
@@ -1,13 +1,13 @@
 [metadata]
 schema_version = "0.1.0-alpha"
-name = "reproducibility"
-display_name = "Scientific Reproducibility Checks"
+name = "amber"
+display_name = "Amber — Scientific Reproducibility Checks"
 version = "0.1.0"
 spec_version = "0.1.0"
 description = "Checks that builds are reproducible and verifiable"
 
 [mcp]
-name = "reproducibility"
+name = "amber"
 description = "Run scientific reproducibility checks on a repository"
 
 [mcp.tools.audit_reproducibility]
diff --git a/packages/darnit-reproducibility/src/darnit_reproducibility/container_pinning.py b/packages/darnit-amber/src/darnit_amber/container_pinning.py
similarity index 100%
rename from packages/darnit-reproducibility/src/darnit_reproducibility/container_pinning.py
rename to packages/darnit-amber/src/darnit_amber/container_pinning.py
diff --git a/packages/darnit-reproducibility/src/darnit_reproducibility/handlers.py b/packages/darnit-amber/src/darnit_amber/handlers.py
similarity index 99%
rename from packages/darnit-reproducibility/src/darnit_reproducibility/handlers.py
rename to packages/darnit-amber/src/darnit_amber/handlers.py
index bb666dcb..41ea9b8a 100644
--- a/packages/darnit-reproducibility/src/darnit_reproducibility/handlers.py
+++ b/packages/darnit-amber/src/darnit_amber/handlers.py
@@ -15,7 +15,7 @@
 
 from .witness_attestation import WitnessCheckResult, check_witness_attestation
 
-logger = get_logger("darnit_reproducibility.handlers")
+logger = get_logger("darnit_amber.handlers")
 
 
 _MAX_EVIDENCE_EXAMPLES = 10
diff --git a/packages/darnit-reproducibility/src/darnit_reproducibility/implementation.py b/packages/darnit-amber/src/darnit_amber/implementation.py
similarity index 94%
rename from packages/darnit-reproducibility/src/darnit_reproducibility/implementation.py
rename to packages/darnit-amber/src/darnit_amber/implementation.py
index 2b4f619b..64c66ecb 100644
--- a/packages/darnit-reproducibility/src/darnit_reproducibility/implementation.py
+++ b/packages/darnit-amber/src/darnit_amber/implementation.py
@@ -4,10 +4,10 @@
 from typing import Any
 
 from darnit.core.plugin import ControlSpec
-from darnit_reproducibility import handlers
+from darnit_amber import handlers
 
 
-class ReproducibilityImplementation:
+class AmberImplementation:
     """Scientific reproducibility checks plugin.
 
     Provides checks for dependency pinning, build environment
@@ -17,11 +17,11 @@ class ReproducibilityImplementation:
 
     @property
     def name(self) -> str:
-        return "reproducibility"
+        return "amber"
 
     @property
     def display_name(self) -> str:
-        return "Scientific Reproducibility Checks"
+        return "Amber — Scientific Reproducibility Checks"
 
     @property
     def version(self) -> str:
@@ -93,11 +93,11 @@ def get_remediation_registry(self) -> dict[str, Any]:
     def get_framework_config_path(self) -> Path | None:
         from importlib.resources import files
 
-        resource = files(__package__) / "reproducibility.toml"
+        resource = files(__package__) / "amber.toml"
         path = Path(str(resource))
         if not path.is_file():
             raise FileNotFoundError(
-                f"reproducibility.toml not found in installed darnit_reproducibility "
+                f"amber.toml not found in installed darnit_amber "
                 f"package at {path}. This indicates a broken build; check the "
                 f"wheel's force-include configuration."
             )
diff --git a/packages/darnit-reproducibility/src/darnit_reproducibility/requirements_pins.py b/packages/darnit-amber/src/darnit_amber/requirements_pins.py
similarity index 100%
rename from packages/darnit-reproducibility/src/darnit_reproducibility/requirements_pins.py
rename to packages/darnit-amber/src/darnit_amber/requirements_pins.py
diff --git a/packages/darnit-reproducibility/src/darnit_reproducibility/witness_attestation.py b/packages/darnit-amber/src/darnit_amber/witness_attestation.py
similarity index 99%
rename from packages/darnit-reproducibility/src/darnit_reproducibility/witness_attestation.py
rename to packages/darnit-amber/src/darnit_amber/witness_attestation.py
index 13016aef..5d00d4b0 100644
--- a/packages/darnit-reproducibility/src/darnit_reproducibility/witness_attestation.py
+++ b/packages/darnit-amber/src/darnit_amber/witness_attestation.py
@@ -41,7 +41,7 @@
 from darnit.core.logging import get_logger
 from darnit.sieve.handler_registry import HandlerContext
 
-logger = get_logger("darnit_reproducibility.witness_attestation")
+logger = get_logger("darnit_amber.witness_attestation")
 
 try:
     from sigstore.models import Bundle
diff --git a/packages/darnit/src/darnit/core/discovery.py b/packages/darnit/src/darnit/core/discovery.py
index 37ad60ef..3cca04d3 100644
--- a/packages/darnit/src/darnit/core/discovery.py
+++ b/packages/darnit/src/darnit/core/discovery.py
@@ -111,7 +111,7 @@ def register_implementation_handlers(framework_name: str | None) -> bool:
     implementations are cached, so repeat calls are cheap and safe.
 
     Args:
-        framework_name: Implementation name (e.g. ``"reproducibility"``).
+        framework_name: Implementation name (e.g. ``"amber"``).
             ``None`` is accepted and is a no-op, so callers that may not
             have resolved a framework do not need to guard.
 
@@ -130,7 +130,7 @@ def register_implementation_handlers(framework_name: str | None) -> bool:
 
     # Two method names are in use across in-tree plugins:
     #   register_handlers       -- documented in CLAUDE.md; darnit-baseline
-    #   register_sieve_handlers -- darnit-gittuf, darnit-reproducibility
+    #   register_sieve_handlers -- darnit-gittuf, darnit-amber
     # Those two work today only because their `register()` entry point calls
     # register_sieve_handlers() during discovery. That is a side channel, not
     # the protocol: discovery results are cached, so any caller that warmed
diff --git a/packaging/README.md b/packaging/README.md
index 2f207a91..2b3af2bd 100644
--- a/packaging/README.md
+++ b/packaging/README.md
@@ -95,7 +95,7 @@ Not currently used. rc tags publish directly to real PyPI as GitHub prereleases.
    - `packages/darnit/pyproject.toml` (name: `darnit-core`)
    - `packages/darnit-baseline/pyproject.toml`
    - `packages/darnit-gittuf/pyproject.toml`
-   - `packages/darnit-reproducibility/pyproject.toml`
+   - `packages/darnit-amber/pyproject.toml`
 4. **Sync and verify locally:**
    ```bash
    uv sync --all-extras
diff --git a/pyproject.toml b/pyproject.toml
index 4765d9d0..7cffdc0c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,7 @@ dependencies = [
     "darnit-core",
     "darnit-baseline",
     "darnit-gittuf",
-    "darnit-reproducibility",
+    "darnit-amber",
 ]
 
 [project.urls]
@@ -31,7 +31,7 @@ Issues = "https://github.com/kusari-oss/darnit/issues"
 
 # darnit-mcp is a metadata-only meta-package: no source, only dependencies
 # that pull in darnit-core, darnit-baseline, darnit-gittuf, and
-# darnit-reproducibility. hatchling matches the backend the sibling packages
+# darnit-amber. hatchling matches the backend the sibling packages
 # use; bypass-selection tells it to produce a wheel with no code payload.
 [build-system]
 requires = ["hatchling"]
@@ -72,7 +72,7 @@ darnit-core = { workspace = true }
 darnit-baseline = { workspace = true }
 darnit-example = { workspace = true }
 darnit-gittuf = { workspace = true }
-darnit-reproducibility = { workspace = true }
+darnit-amber = { workspace = true }
 darnit-hello = { workspace = true }
 darnit-testchecks = { workspace = true }
 darnit-csl = { workspace = true }
diff --git a/scripts/audit_hermetic_real_repos.py b/scripts/audit_hermetic_real_repos.py
index a4a13472..81a4b9ba 100644
--- a/scripts/audit_hermetic_real_repos.py
+++ b/scripts/audit_hermetic_real_repos.py
@@ -15,7 +15,7 @@
 import tempfile
 from pathlib import Path
 
-from darnit_reproducibility.handlers import repro_hermetic_build_handler
+from darnit_amber.handlers import repro_hermetic_build_handler
 
 from darnit.sieve.handler_registry import HandlerContext
 
diff --git a/tests/darnit/sieve/baseline_capture.py b/tests/darnit/sieve/baseline_capture.py
index cc798e49..8600a8ba 100644
--- a/tests/darnit/sieve/baseline_capture.py
+++ b/tests/darnit/sieve/baseline_capture.py
@@ -54,7 +54,7 @@
 # one exercising the most handler dispatch paths. The network-dependent controls
 # that were dropped are precisely the ones the two-run diff would have excluded
 # as nondeterministic anyway, so their coverage was illusory.
-FRAMEWORK_NAMES = ("reproducibility", "openssf-baseline")
+FRAMEWORK_NAMES = ("amber", "openssf-baseline")
 FIXTURE_NAMES = ("all_pass_repo", "mixed_repo")
 
 
diff --git a/tests/darnit/sieve/test_handler_authority_regression.py b/tests/darnit/sieve/test_handler_authority_regression.py
index c456aa4d..9bf7bf97 100644
--- a/tests/darnit/sieve/test_handler_authority_regression.py
+++ b/tests/darnit/sieve/test_handler_authority_regression.py
@@ -2,7 +2,7 @@
 
 The `handler_registry.register()` API used to have a
 `default_authority = "suggestive"` fallback. Every plugin handler in
-darnit-gittuf, darnit-reproducibility, and darnit-baseline was registered
+darnit-gittuf, darnit-amber, and darnit-baseline was registered
 without the argument -- so every observation-based control from every
 plugin silently regressed PASS -> WARN because a suggestive result
 never terminates the Check phase.
@@ -94,7 +94,7 @@ class TestPluginHandlersAreDispositive:
         # darnit-gittuf
         "gittuf_verify_policy",
         "gittuf_commits_signed",
-        # darnit-reproducibility
+        # darnit-amber
         "repro_deps_pinned",
         "repro_build_env_declared",
         "repro_hermetic_build",
@@ -144,13 +144,13 @@ def _register_all_known_plugin_handlers() -> None:
         except Exception:
             pass
 
-        # darnit-reproducibility
+        # darnit-amber
         try:
-            from darnit_reproducibility.implementation import (
-                ReproducibilityImplementation,
+            from darnit_amber.implementation import (
+                AmberImplementation,
             )
 
-            ReproducibilityImplementation().register_sieve_handlers()
+            AmberImplementation().register_sieve_handlers()
         except Exception:
             pass
 
diff --git a/tests/darnit/test_plugin_handler_registration.py b/tests/darnit/test_plugin_handler_registration.py
index 28f609aa..ae1b5197 100644
--- a/tests/darnit/test_plugin_handler_registration.py
+++ b/tests/darnit/test_plugin_handler_registration.py
@@ -1,7 +1,7 @@
 """Plugin sieve-handler registration and control ordering.
 
 Covers issues #427 and #428, both reported against the
-`darnit-reproducibility` plugin but rooted in the framework.
+`darnit-amber` plugin but rooted in the framework.
 
 #427: plugin-provided sieve handlers never reached the registry outside
 the MCP server path, so every control referencing one fell through to
@@ -21,7 +21,7 @@
 from darnit.core.discovery import register_implementation_handlers
 from darnit.sieve.handler_registry import get_sieve_handler_registry
 
-# Handlers shipped by darnit-reproducibility. It is the in-tree plugin that
+# Handlers shipped by darnit-amber. It is the in-tree plugin that
 # exercises the `register_sieve_handlers` spelling (see the naming note in
 # TestProtocolMethodNaming below).
 _REPRO_HANDLERS = (
@@ -37,8 +37,8 @@ class TestRegisterImplementationHandlers:
     """#427: registration must be explicit, not a side effect of discovery."""
 
     @pytest.mark.unit
-    def test_registers_reproducibility_handlers(self) -> None:
-        assert register_implementation_handlers("reproducibility") is True
+    def test_registers_amber_handlers(self) -> None:
+        assert register_implementation_handlers("amber") is True
 
         registry = get_sieve_handler_registry()
         missing = [h for h in _REPRO_HANDLERS if registry.get(h) is None]
@@ -65,7 +65,7 @@ def test_works_when_discovery_cache_is_already_warm(self) -> None:
         from darnit.core.discovery import discover_implementations
 
         discover_implementations()  # warm the cache first
-        assert register_implementation_handlers("reproducibility") is True
+        assert register_implementation_handlers("amber") is True
 
         registry = get_sieve_handler_registry()
         assert all(registry.get(h) is not None for h in _REPRO_HANDLERS)
@@ -82,8 +82,8 @@ def test_unknown_framework_is_a_noop(self) -> None:
     @pytest.mark.unit
     def test_is_idempotent(self) -> None:
         """Called once per audit; repeat calls must not raise."""
-        assert register_implementation_handlers("reproducibility") is True
-        assert register_implementation_handlers("reproducibility") is True
+        assert register_implementation_handlers("amber") is True
+        assert register_implementation_handlers("amber") is True
 
     @pytest.mark.unit
     def test_plugin_exception_is_contained(self) -> None:
@@ -105,7 +105,7 @@ class TestProtocolMethodNaming:
     """Both in-tree spellings of the registration method must be honored.
 
     `CLAUDE.md` documents `register_handlers()`, and darnit-baseline
-    implements it. darnit-gittuf and darnit-reproducibility implement
+    implements it. darnit-gittuf and darnit-amber implement
     `register_sieve_handlers()` instead. Until those converge, the
     framework accepts either -- otherwise two of four in-tree plugins
     register nothing.
diff --git a/tests/darnit_reproducibility/__init__.py b/tests/darnit_amber/__init__.py
similarity index 100%
rename from tests/darnit_reproducibility/__init__.py
rename to tests/darnit_amber/__init__.py
diff --git a/tests/darnit_reproducibility/baselines/deps_pinned_before.json b/tests/darnit_amber/baselines/deps_pinned_before.json
similarity index 100%
rename from tests/darnit_reproducibility/baselines/deps_pinned_before.json
rename to tests/darnit_amber/baselines/deps_pinned_before.json
diff --git a/tests/darnit_reproducibility/conftest.py b/tests/darnit_amber/conftest.py
similarity index 97%
rename from tests/darnit_reproducibility/conftest.py
rename to tests/darnit_amber/conftest.py
index d3ff9e5b..812e38ef 100644
--- a/tests/darnit_reproducibility/conftest.py
+++ b/tests/darnit_amber/conftest.py
@@ -36,7 +36,7 @@ def capture_deps_pinned(repo: Path) -> dict[str, Any]:
     Imported lazily so this module stays importable regardless of which
     handler internals exist at any point during the feature's implementation.
     """
-    from darnit_reproducibility.handlers import repro_deps_pinned_handler
+    from darnit_amber.handlers import repro_deps_pinned_handler
 
     result = repro_deps_pinned_handler({}, make_handler_ctx(repo))
     return {
diff --git a/tests/darnit_reproducibility/fixtures/compound_repo/requirements.txt b/tests/darnit_amber/fixtures/compound_repo/requirements.txt
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/compound_repo/requirements.txt
rename to tests/darnit_amber/fixtures/compound_repo/requirements.txt
diff --git a/tests/darnit_reproducibility/fixtures/dev_requirements_repo/requirements-dev.txt b/tests/darnit_amber/fixtures/dev_requirements_repo/requirements-dev.txt
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/dev_requirements_repo/requirements-dev.txt
rename to tests/darnit_amber/fixtures/dev_requirements_repo/requirements-dev.txt
diff --git a/tests/darnit_reproducibility/fixtures/dev_requirements_repo/requirements/base.txt b/tests/darnit_amber/fixtures/dev_requirements_repo/requirements/base.txt
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/dev_requirements_repo/requirements/base.txt
rename to tests/darnit_amber/fixtures/dev_requirements_repo/requirements/base.txt
diff --git a/tests/darnit_reproducibility/fixtures/empty_repo/requirements.txt b/tests/darnit_amber/fixtures/empty_repo/requirements.txt
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/empty_repo/requirements.txt
rename to tests/darnit_amber/fixtures/empty_repo/requirements.txt
diff --git a/tests/darnit_reproducibility/fixtures/hash_pinned_repo/requirements.txt b/tests/darnit_amber/fixtures/hash_pinned_repo/requirements.txt
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/hash_pinned_repo/requirements.txt
rename to tests/darnit_amber/fixtures/hash_pinned_repo/requirements.txt
diff --git a/tests/darnit_reproducibility/fixtures/include_repo/requirements.txt b/tests/darnit_amber/fixtures/include_repo/requirements.txt
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/include_repo/requirements.txt
rename to tests/darnit_amber/fixtures/include_repo/requirements.txt
diff --git a/tests/darnit_reproducibility/fixtures/lock_plus_loose_repo/requirements.txt b/tests/darnit_amber/fixtures/lock_plus_loose_repo/requirements.txt
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/lock_plus_loose_repo/requirements.txt
rename to tests/darnit_amber/fixtures/lock_plus_loose_repo/requirements.txt
diff --git a/tests/darnit_reproducibility/fixtures/lock_plus_loose_repo/uv.lock b/tests/darnit_amber/fixtures/lock_plus_loose_repo/uv.lock
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/lock_plus_loose_repo/uv.lock
rename to tests/darnit_amber/fixtures/lock_plus_loose_repo/uv.lock
diff --git a/tests/darnit_reproducibility/fixtures/markers_repo/requirements.txt b/tests/darnit_amber/fixtures/markers_repo/requirements.txt
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/markers_repo/requirements.txt
rename to tests/darnit_amber/fixtures/markers_repo/requirements.txt
diff --git a/tests/darnit_reproducibility/fixtures/mixed_hash_repo/requirements.txt b/tests/darnit_amber/fixtures/mixed_hash_repo/requirements.txt
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/mixed_hash_repo/requirements.txt
rename to tests/darnit_amber/fixtures/mixed_hash_repo/requirements.txt
diff --git a/tests/darnit_reproducibility/fixtures/options_repo/requirements.txt b/tests/darnit_amber/fixtures/options_repo/requirements.txt
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/options_repo/requirements.txt
rename to tests/darnit_amber/fixtures/options_repo/requirements.txt
diff --git a/tests/darnit_reproducibility/fixtures/partial_pin_repo/requirements.txt b/tests/darnit_amber/fixtures/partial_pin_repo/requirements.txt
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/partial_pin_repo/requirements.txt
rename to tests/darnit_amber/fixtures/partial_pin_repo/requirements.txt
diff --git a/tests/darnit_reproducibility/fixtures/unpinned_repo/requirements.txt b/tests/darnit_amber/fixtures/unpinned_repo/requirements.txt
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/unpinned_repo/requirements.txt
rename to tests/darnit_amber/fixtures/unpinned_repo/requirements.txt
diff --git a/tests/darnit_reproducibility/fixtures/vcs_branch_repo/requirements.txt b/tests/darnit_amber/fixtures/vcs_branch_repo/requirements.txt
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/vcs_branch_repo/requirements.txt
rename to tests/darnit_amber/fixtures/vcs_branch_repo/requirements.txt
diff --git a/tests/darnit_reproducibility/fixtures/vcs_sha_repo/requirements.txt b/tests/darnit_amber/fixtures/vcs_sha_repo/requirements.txt
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/vcs_sha_repo/requirements.txt
rename to tests/darnit_amber/fixtures/vcs_sha_repo/requirements.txt
diff --git a/tests/darnit_reproducibility/fixtures/version_pinned_repo/requirements.txt b/tests/darnit_amber/fixtures/version_pinned_repo/requirements.txt
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/version_pinned_repo/requirements.txt
rename to tests/darnit_amber/fixtures/version_pinned_repo/requirements.txt
diff --git a/tests/darnit_reproducibility/fixtures/wildcard_repo/requirements.txt b/tests/darnit_amber/fixtures/wildcard_repo/requirements.txt
similarity index 100%
rename from tests/darnit_reproducibility/fixtures/wildcard_repo/requirements.txt
rename to tests/darnit_amber/fixtures/wildcard_repo/requirements.txt
diff --git a/tests/darnit_reproducibility/test_container_pinning.py b/tests/darnit_amber/test_container_pinning.py
similarity index 98%
rename from tests/darnit_reproducibility/test_container_pinning.py
rename to tests/darnit_amber/test_container_pinning.py
index d4887439..9885b0ad 100644
--- a/tests/darnit_reproducibility/test_container_pinning.py
+++ b/tests/darnit_amber/test_container_pinning.py
@@ -8,7 +8,7 @@
 from __future__ import annotations
 
 import pytest
-from darnit_reproducibility.container_pinning import (
+from darnit_amber.container_pinning import (
     ContainerClassification,
     PinKind,
     classify,
diff --git a/tests/darnit_reproducibility/test_deps_pinned_baseline.py b/tests/darnit_amber/test_deps_pinned_baseline.py
similarity index 100%
rename from tests/darnit_reproducibility/test_deps_pinned_baseline.py
rename to tests/darnit_amber/test_deps_pinned_baseline.py
diff --git a/tests/darnit_reproducibility/test_handlers.py b/tests/darnit_amber/test_handlers.py
similarity index 97%
rename from tests/darnit_reproducibility/test_handlers.py
rename to tests/darnit_amber/test_handlers.py
index d0185383..3c460145 100644
--- a/tests/darnit_reproducibility/test_handlers.py
+++ b/tests/darnit_amber/test_handlers.py
@@ -3,7 +3,7 @@
 from pathlib import Path
 
 import pytest
-from darnit_reproducibility.handlers import (
+from darnit_amber.handlers import (
     _detect_strong_hermeticity_signal,
     _iter_build_files,
     _iter_composite_action_files,
@@ -19,7 +19,7 @@
     repro_hermetic_build_handler,
     repro_provenance_exists_handler,
 )
-from darnit_reproducibility.witness_attestation import WitnessCheckResult
+from darnit_amber.witness_attestation import WitnessCheckResult
 
 from darnit.sieve.handler_registry import HandlerContext, HandlerResultStatus
 
@@ -33,7 +33,7 @@
 @pytest.fixture(autouse=True)
 def _stub_witness_attestation(monkeypatch: pytest.MonkeyPatch) -> None:
     monkeypatch.setattr(
-        "darnit_reproducibility.handlers.check_witness_attestation",
+        "darnit_amber.handlers.check_witness_attestation",
         lambda ctx: NO_WITNESS_EVIDENCE,
     )
 
@@ -267,7 +267,7 @@ def test_verified_witness_attestation_is_a_signal(self, tmp_path: Path, monkeypa
             network_clean=True,
             detail="runtime-trace predicate recorded an empty network log",
         )
-        monkeypatch.setattr("darnit_reproducibility.handlers.check_witness_attestation", lambda ctx: verified)
+        monkeypatch.setattr("darnit_amber.handlers.check_witness_attestation", lambda ctx: verified)
         signal, witness_result = _detect_strong_hermeticity_signal(tmp_path, [], {}, make_ctx(tmp_path), {})
         assert signal is not None
         assert "Witness" in signal
@@ -282,14 +282,14 @@ def test_verified_witness_attestation_with_network_activity_is_not_a_pass_signal
             network_clean=False,
             detail="runtime-trace predicate recorded 2 network event(s)",
         )
-        monkeypatch.setattr("darnit_reproducibility.handlers.check_witness_attestation", lambda ctx: dirty)
+        monkeypatch.setattr("darnit_amber.handlers.check_witness_attestation", lambda ctx: dirty)
         signal, witness_result = _detect_strong_hermeticity_signal(tmp_path, [], {}, make_ctx(tmp_path), {})
         assert signal is None
         assert witness_result.network_clean is False
 
     def test_witness_check_disabled_via_config(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
         verified = WitnessCheckResult(attempted=True, verified=True, network_clean=True, detail="clean")
-        monkeypatch.setattr("darnit_reproducibility.handlers.check_witness_attestation", lambda ctx: verified)
+        monkeypatch.setattr("darnit_amber.handlers.check_witness_attestation", lambda ctx: verified)
         signal, witness_result = _detect_strong_hermeticity_signal(
             tmp_path, [], {}, make_ctx(tmp_path), {"verify_witness_attestations": False}
         )
@@ -358,7 +358,7 @@ def test_witness_takes_priority_over_nix(self, tmp_path: Path, monkeypatch: pyte
         # text-based hint that Witness is in use (e.g. it ran via a reusable
         # workflow the caller's own CI files never name).
         verified = WitnessCheckResult(attempted=True, verified=True, network_clean=True, detail="clean")
-        monkeypatch.setattr("darnit_reproducibility.handlers.check_witness_attestation", lambda ctx: verified)
+        monkeypatch.setattr("darnit_amber.handlers.check_witness_attestation", lambda ctx: verified)
         (tmp_path / "flake.nix").write_text("{ outputs = {}; }")
         wf = tmp_path / "ci.yml"
         wf.write_text("- run: nix build .#default\n")
@@ -398,20 +398,20 @@ def spy(ctx: HandlerContext) -> WitnessCheckResult:
             called = True
             return WitnessCheckResult(attempted=True, verified=True, network_clean=True)
 
-        monkeypatch.setattr("darnit_reproducibility.handlers.check_witness_attestation", spy)
+        monkeypatch.setattr("darnit_amber.handlers.check_witness_attestation", spy)
         result = _maybe_check_witness_attestation(make_ctx(tmp_path), {"verify_witness_attestations": False})
         assert called is False
         assert result.attempted is False
 
     def test_enabled_by_default(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
         expected = WitnessCheckResult(attempted=True, verified=True, network_clean=True)
-        monkeypatch.setattr("darnit_reproducibility.handlers.check_witness_attestation", lambda ctx: expected)
+        monkeypatch.setattr("darnit_amber.handlers.check_witness_attestation", lambda ctx: expected)
         result = _maybe_check_witness_attestation(make_ctx(tmp_path), {})
         assert result is expected
 
     def test_explicitly_enabled_via_config(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
         expected = WitnessCheckResult(attempted=True, verified=True, network_clean=True)
-        monkeypatch.setattr("darnit_reproducibility.handlers.check_witness_attestation", lambda ctx: expected)
+        monkeypatch.setattr("darnit_amber.handlers.check_witness_attestation", lambda ctx: expected)
         result = _maybe_check_witness_attestation(make_ctx(tmp_path), {"verify_witness_attestations": True})
         assert result is expected
 
@@ -446,9 +446,7 @@ def test_inconclusive_with_pyproject_name_only(self, tmp_path: Path) -> None:
         assert result.status == HandlerResultStatus.INCONCLUSIVE
 
     def test_fail_with_pyproject_dependencies(self, tmp_path: Path) -> None:
-        (tmp_path / "pyproject.toml").write_text(
-            "[project]\nname = 'pkg'\ndependencies = ['requests>=2.0']\n"
-        )
+        (tmp_path / "pyproject.toml").write_text("[project]\nname = 'pkg'\ndependencies = ['requests>=2.0']\n")
         result = repro_deps_pinned_handler({}, make_ctx(tmp_path))
         assert result.status == HandlerResultStatus.FAIL
 
@@ -624,7 +622,7 @@ def test_unreadable_file_never_reaches_the_classifier(
         self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch
     ) -> None:
         """Contract T-7. Cannot be a committed fixture: needs a runtime chmod."""
-        import darnit_reproducibility.requirements_pins as pins
+        import darnit_amber.requirements_pins as pins
 
         calls = []
         monkeypatch.setattr(
@@ -666,7 +664,7 @@ def test_lock_file_short_circuits_before_reading_contents(
     ) -> None:
         """FR-001 / US3: the lock file decides and the requirements contents
         are never consulted."""
-        import darnit_reproducibility.requirements_pins as pins
+        import darnit_amber.requirements_pins as pins
 
         calls: list[str] = []
         original = pins.classify
@@ -928,7 +926,7 @@ def test_pass_verified_witness_attestation(self, tmp_path: Path, monkeypatch: py
             network_clean=True,
             detail="runtime-trace predicate recorded an empty network log",
         )
-        monkeypatch.setattr("darnit_reproducibility.handlers.check_witness_attestation", lambda ctx: verified)
+        monkeypatch.setattr("darnit_amber.handlers.check_witness_attestation", lambda ctx: verified)
         wf_dir = tmp_path / ".github" / "workflows"
         wf_dir.mkdir(parents=True)
         (wf_dir / "ci.yml").write_text("steps:\n  - uses: testifysec/witness-run-action@v0.1\n")
@@ -946,7 +944,7 @@ def test_fail_verified_witness_attestation_with_network_activity(
             detail="runtime-trace predicate recorded 1 network event(s)",
             evidence={"artifact": "witness-attestation.json"},
         )
-        monkeypatch.setattr("darnit_reproducibility.handlers.check_witness_attestation", lambda ctx: dirty)
+        monkeypatch.setattr("darnit_amber.handlers.check_witness_attestation", lambda ctx: dirty)
         wf_dir = tmp_path / ".github" / "workflows"
         wf_dir.mkdir(parents=True)
         (wf_dir / "ci.yml").write_text("steps:\n  - run: uv sync\n")
@@ -958,7 +956,7 @@ def test_witness_verification_disabled_via_config(self, tmp_path: Path, monkeypa
         # Even a mocked verified/clean attestation must not produce a PASS
         # when the pass config opts out of the network round-trip.
         verified = WitnessCheckResult(attempted=True, verified=True, network_clean=True, detail="clean")
-        monkeypatch.setattr("darnit_reproducibility.handlers.check_witness_attestation", lambda ctx: verified)
+        monkeypatch.setattr("darnit_amber.handlers.check_witness_attestation", lambda ctx: verified)
         wf_dir = tmp_path / ".github" / "workflows"
         wf_dir.mkdir(parents=True)
         (wf_dir / "ci.yml").write_text("steps:\n  - uses: testifysec/witness-run-action@v0.1\n")
diff --git a/tests/darnit_reproducibility/test_implementation.py b/tests/darnit_amber/test_implementation.py
similarity index 77%
rename from tests/darnit_reproducibility/test_implementation.py
rename to tests/darnit_amber/test_implementation.py
index 2278d311..22962410 100644
--- a/tests/darnit_reproducibility/test_implementation.py
+++ b/tests/darnit_amber/test_implementation.py
@@ -1,16 +1,16 @@
-"""Tests for ReproducibilityImplementation plugin protocol compliance."""
+"""Tests for AmberImplementation plugin protocol compliance."""
 
-from darnit_reproducibility.implementation import ReproducibilityImplementation
+from darnit_amber.implementation import AmberImplementation
 
 
-class TestReproducibilityImplementation:
-    """Tests that ReproducibilityImplementation satisfies the plugin protocol."""
+class TestAmberImplementation:
+    """Tests that AmberImplementation satisfies the plugin protocol."""
 
     def setup_method(self):
-        self.impl = ReproducibilityImplementation()
+        self.impl = AmberImplementation()
 
     def test_name(self) -> None:
-        assert self.impl.name == "reproducibility"
+        assert self.impl.name == "amber"
 
     def test_display_name(self) -> None:
         assert len(self.impl.display_name) > 0
@@ -45,12 +45,15 @@ def test_check_handlers_covers_all_controls(self) -> None:
             get_sieve_handler_registry,
             reset_sieve_handler_registry,
         )
+
         reset_sieve_handler_registry()
         self.impl.register_sieve_handlers()
         registry = get_sieve_handler_registry()
         expected = {
-            "repro_deps_pinned", "repro_build_env_declared",
-            "repro_hermetic_build", "repro_provenance_exists",
+            "repro_deps_pinned",
+            "repro_build_env_declared",
+            "repro_hermetic_build",
+            "repro_provenance_exists",
             "repro_bit_for_bit",
         }
         for name in expected:
@@ -61,12 +64,15 @@ def test_all_check_handlers_are_callable(self) -> None:
             get_sieve_handler_registry,
             reset_sieve_handler_registry,
         )
+
         reset_sieve_handler_registry()
         self.impl.register_sieve_handlers()
         registry = get_sieve_handler_registry()
         for name in [
-            "repro_deps_pinned", "repro_build_env_declared",
-            "repro_hermetic_build", "repro_provenance_exists",
+            "repro_deps_pinned",
+            "repro_build_env_declared",
+            "repro_hermetic_build",
+            "repro_provenance_exists",
             "repro_bit_for_bit",
         ]:
             info = registry.get(name)
diff --git a/tests/darnit_reproducibility/test_repro_corpus.py b/tests/darnit_amber/test_repro_corpus.py
similarity index 98%
rename from tests/darnit_reproducibility/test_repro_corpus.py
rename to tests/darnit_amber/test_repro_corpus.py
index 23e061b1..ae620eea 100644
--- a/tests/darnit_reproducibility/test_repro_corpus.py
+++ b/tests/darnit_amber/test_repro_corpus.py
@@ -18,7 +18,7 @@
 from pathlib import Path
 
 import pytest
-from darnit_reproducibility.handlers import (
+from darnit_amber.handlers import (
     repro_bit_for_bit_handler,
     repro_build_env_declared_handler,
     repro_deps_pinned_handler,
diff --git a/tests/darnit_reproducibility/test_requirements_pins.py b/tests/darnit_amber/test_requirements_pins.py
similarity index 99%
rename from tests/darnit_reproducibility/test_requirements_pins.py
rename to tests/darnit_amber/test_requirements_pins.py
index cc8a983f..a38aefeb 100644
--- a/tests/darnit_reproducibility/test_requirements_pins.py
+++ b/tests/darnit_amber/test_requirements_pins.py
@@ -8,7 +8,7 @@
 from __future__ import annotations
 
 import pytest
-from darnit_reproducibility.requirements_pins import (
+from darnit_amber.requirements_pins import (
     FileClassification,
     PinClassification,
     classify,
diff --git a/tests/darnit_reproducibility/test_requirements_preprocessing.py b/tests/darnit_amber/test_requirements_preprocessing.py
similarity index 98%
rename from tests/darnit_reproducibility/test_requirements_preprocessing.py
rename to tests/darnit_amber/test_requirements_preprocessing.py
index 75f3f1cc..9bee36a4 100644
--- a/tests/darnit_reproducibility/test_requirements_preprocessing.py
+++ b/tests/darnit_amber/test_requirements_preprocessing.py
@@ -8,7 +8,7 @@
 from __future__ import annotations
 
 import pytest
-from darnit_reproducibility.requirements_pins import (
+from darnit_amber.requirements_pins import (
     FileClassification,
     classify,
     parse,
diff --git a/tests/darnit_reproducibility/test_witness_attestation.py b/tests/darnit_amber/test_witness_attestation.py
similarity index 98%
rename from tests/darnit_reproducibility/test_witness_attestation.py
rename to tests/darnit_amber/test_witness_attestation.py
index 0fc4cfa3..79437134 100644
--- a/tests/darnit_reproducibility/test_witness_attestation.py
+++ b/tests/darnit_amber/test_witness_attestation.py
@@ -14,7 +14,7 @@
 from typing import Any
 
 import pytest
-from darnit_reproducibility import witness_attestation as wa
+from darnit_amber import witness_attestation as wa
 
 from darnit.sieve.handler_registry import HandlerContext
 
@@ -185,7 +185,11 @@ def test_missing_repo_returns_reason(self, tmp_path: Path) -> None:
         assert "owner/name not available" in reason
 
     def test_no_run_found_propagates_reason(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
-        monkeypatch.setattr(wa, "_latest_successful_run_id", lambda owner, repo, branch: (None, "no successful CI run found on branch 'main'"))
+        monkeypatch.setattr(
+            wa,
+            "_latest_successful_run_id",
+            lambda owner, repo, branch: (None, "no successful CI run found on branch 'main'"),
+        )
         files, reason = wa._fetch_candidate_files(make_ctx(), tmp_path)
         assert files == []
         assert "no successful CI run" in reason
diff --git a/tests/packaging/test_wheel_install_config.py b/tests/packaging/test_wheel_install_config.py
index 8ca32489..99e80016 100644
--- a/tests/packaging/test_wheel_install_config.py
+++ b/tests/packaging/test_wheel_install_config.py
@@ -1,7 +1,7 @@
 """Wheel-install regression test for framework config resolution (feature 021).
 
 Every darnit implementation package (darnit-baseline, darnit-gittuf,
-darnit-reproducibility) MUST resolve its framework TOML correctly when
+darnit-amber) MUST resolve its framework TOML correctly when
 installed from a built wheel, not just from an editable checkout. This
 test builds each wheel, installs it into a fresh venv, and asserts:
 
@@ -33,7 +33,7 @@
 IMPLEMENTATIONS = [
     ("darnit-baseline", "darnit_baseline", "openssf-baseline.toml"),
     ("darnit-gittuf", "darnit_gittuf", "gittuf.toml"),
-    ("darnit-reproducibility", "darnit_reproducibility", "reproducibility.toml"),
+    ("darnit-amber", "darnit_amber", "amber.toml"),
 ]
 
 
@@ -172,7 +172,7 @@ def test_framework_config_resolves_under_wheel_install(
     framework_key = {
         "darnit-baseline": "openssf-baseline",
         "darnit-gittuf": "gittuf",
-        "darnit-reproducibility": "reproducibility",
+        "darnit-amber": "amber",
     }[package_name]
     assert framework_key in combined, (
         f"{package_name}: framework key '{framework_key}' not in darnit list output\n"
diff --git a/uv.lock b/uv.lock
index fb781b55..afce0223 100644
--- a/uv.lock
+++ b/uv.lock
@@ -8,6 +8,7 @@ resolution-markers = [
 
 [manifest]
 members = [
+    "darnit-amber",
     "darnit-baseline",
     "darnit-core",
     "darnit-csl",
@@ -16,7 +17,6 @@ members = [
     "darnit-hello",
     "darnit-mcp",
     "darnit-plugins",
-    "darnit-reproducibility",
     "darnit-testchecks",
 ]
 
@@ -465,6 +465,21 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/1a/89/843b53614b47f97fe1abc13f9a86efa5ec9e275292c457af1d4a60dc80e0/cryptography-46.0.6-pp311-pypy311_pp73-win_amd64.whl", hash = "sha256:6728c49e3b2c180ef26f8e9f0a883a2c585638db64cf265b49c9ba10652d430e", size = 3409955, upload-time = "2026-03-25T23:34:48.465Z" },
 ]
 
+[[package]]
+name = "darnit-amber"
+version = "0.1.0"
+source = { editable = "packages/darnit-amber" }
+dependencies = [
+    { name = "darnit-core" },
+    { name = "packaging" },
+]
+
+[package.metadata]
+requires-dist = [
+    { name = "darnit-core", editable = "packages/darnit" },
+    { name = "packaging", specifier = ">=23.0" },
+]
+
 [[package]]
 name = "darnit-baseline"
 version = "0.1.0"
@@ -572,10 +587,10 @@ name = "darnit-mcp"
 version = "0.1.0"
 source = { editable = "." }
 dependencies = [
+    { name = "darnit-amber" },
     { name = "darnit-baseline" },
     { name = "darnit-core" },
     { name = "darnit-gittuf" },
-    { name = "darnit-reproducibility" },
 ]
 
 [package.optional-dependencies]
@@ -611,11 +626,11 @@ dev = [
 [package.metadata]
 requires-dist = [
     { name = "claude-agent-sdk", marker = "extra == 'parity-tier2'", specifier = ">=0.1.0" },
+    { name = "darnit-amber", editable = "packages/darnit-amber" },
     { name = "darnit-baseline", editable = "packages/darnit-baseline" },
     { name = "darnit-core", editable = "packages/darnit" },
     { name = "darnit-core", extras = ["attestation"], marker = "extra == 'attestation'", editable = "packages/darnit" },
     { name = "darnit-gittuf", editable = "packages/darnit-gittuf" },
-    { name = "darnit-reproducibility", editable = "packages/darnit-reproducibility" },
     { name = "openai", marker = "extra == 'parity-tier2'", specifier = ">=1.50" },
     { name = "pre-commit", marker = "extra == 'dev'", specifier = ">=4.0.0" },
     { name = "pytest", marker = "extra == 'dev'", specifier = ">=8.0.0" },
@@ -661,21 +676,6 @@ requires-dist = [
 ]
 provides-extras = ["dev"]
 
-[[package]]
-name = "darnit-reproducibility"
-version = "0.1.0"
-source = { editable = "packages/darnit-reproducibility" }
-dependencies = [
-    { name = "darnit-core" },
-    { name = "packaging" },
-]
-
-[package.metadata]
-requires-dist = [
-    { name = "darnit-core", editable = "packages/darnit" },
-    { name = "packaging", specifier = ">=23.0" },
-]
-
 [[package]]
 name = "darnit-testchecks"
 version = "0.1.0"