diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a1e7502..e7161f2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ on:
 jobs:
   build:
     name: Tests
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
       - name: Checkout code
         uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
diff --git a/Dockerfile b/Dockerfile
index 542e252..dc94639 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,14 +1,19 @@
-# Prefer a pinned image which is used in other Dockerfiles.
-# alpine:3.23.6@sha256:85fe1e81d6758c208f3e1eed4338a1997e19d4be002d4dd32d3100c9a8c010a0
-# alpine:3.24.2@sha256:294b683cb724975bec92580e1e685676bd4b50bda910ddb8c51d4cabeaec77e6
-# debian:bookworm-slim@sha256:f9c6a2fd2ddbc23e336b6257a5245e31f996953ef06cd13a59fa0a1df2d5c252
-# ubuntu:26.04@sha256:f144425ff09be612d6d9ad965196e9cdc23dae1f42110a8a11a3e9a8198759f7
-# ubuntu:24.04@sha256:534baea6a22c03a63003dbc8dbe78fe34bc0d7e595d9a9dc9834884ff530eb55
 FROM alpine:3.24.2@sha256:294b683cb724975bec92580e1e685676bd4b50bda910ddb8c51d4cabeaec77e6
 
-# install packages required to run the tests
-RUN apk add --no-cache coreutils
+RUN apk add --no-cache python3 py3-pip
+RUN pip install --user --break-system-packages 'gdtoolkit == 4.5.0'
+# gdtoolkit pins an older lark release. Force a newer version.
+RUN pip install --user --break-system-packages --no-deps 'lark == 1.3.1'
+
+# Load and cache the gdscipt grammar
+RUN python3 -c 'import gdtoolkit.parser; gdtoolkit.parser.parser.parse("")'
+
+# Everything prior to this line should be synced with gdscript-representer/Dockerfile
 
 WORKDIR /opt/analyzer
-COPY . .
-ENTRYPOINT ["/opt/analyzer/bin/run.sh"]
+
+COPY gdlintrc gdlintrc
+COPY bin/run.sh bin/run.sh
+COPY bin/run.py bin/run.py
+
+ENTRYPOINT ["/opt/representer/bin/run.sh"]
diff --git a/README.md b/README.md
index b7b4914..decba1e 100644
--- a/README.md
+++ b/README.md
@@ -2,14 +2,9 @@
 
 The Docker image to automatically run tests on GDScript solutions submitted to [Exercism].
 
-## Getting started
+## Implementation
 
-Build the analyzer, conforming to the [analyzer interface specification](https://github.com/exercism/docs/blob/main/building/tooling/analyzers/interface.md).
-Update the files to match your track's needs.
-At the very least, you'll need to update `bin/run.sh`, `Dockerfile` and the test solutions in the `tests` directory
-
-- Tip: look for `TODO:` comments to point you towards code that need updating
-- Tip: look for `OPTIONAL:` comments to point you towards code that _could_ be useful
+The analyzer wraps the `gdlint` logic from `gdtoolkit` and outputs the results matching the Exercism interface.
 
 ## Run the analyzer
 
diff --git a/bin/run-tests.sh b/bin/run-tests.sh
index d4bbf19..efdf59b 100755
--- a/bin/run-tests.sh
+++ b/bin/run-tests.sh
@@ -24,7 +24,7 @@ for test_dir in tests/*; do
         expected_file="expected_${file}"
         echo "${test_dir_name}: comparing ${file} to ${expected_file}"
 
-        if ! diff "${test_dir_path}/${file}" "${test_dir_path}/${expected_file}"; then
+        if ! diff "${test_dir_path}/${expected_file}" "${test_dir_path}/${file}"; then
             exit_code=1
         fi
     done
diff --git a/bin/run.py b/bin/run.py
new file mode 100755
index 0000000..cc04396
--- /dev/null
+++ b/bin/run.py
@@ -0,0 +1,84 @@
+#!/usr/bin/env python3
+"""Generate a representation of a GDScript solution."""
+
+import argparse
+import dataclasses
+import json
+import pathlib
+import yaml
+
+import gdtoolkit.linter
+
+
+def gdlintrc() -> dict:
+    """Load the gdlint config."""
+    path = pathlib.Path("gdlintrc")
+    if path.exists():
+        return yaml.load(pathlib.Path("gdlintrc").read_text(), Loader=yaml.Loader)
+    return gdtoolkit.linter.DEFAULT_CONFIG
+
+
+def load_config(input_path: pathlib.Path) -> dict | None:
+    """Return the contents of .meta/config.json if it exists, or None."""
+    config_path = input_path / ".meta/config.json"
+    if not config_path.exists():
+        return None
+    return json.loads((input_path / ".meta/config.json").read_text())
+
+
+def solution_files(slug: str, input_path: pathlib.Path) -> list[pathlib.Path]:
+    """Return the solution files, based on the config.json if available, or the slug."""
+    config = load_config(input_path)
+    if config:
+        files = config.get("files", {}).get("solution", [])
+        if files:
+            return [input_path / file for file in files]
+    return [(input_path / slug.replace("-", "_")).with_suffix(".gd")]
+
+
+def format_comments(path: pathlib.Path, problems: list[gdtoolkit.linter.problem.Problem]) -> list[dict[str, str]]:
+    return [
+        {"comment": "gdscript.gdlint.finding", "params": dataclasses.asdict(problem) | {"file": path.name}}
+        for problem in problems
+    ]
+
+
+def write_output(output_path: pathlib.Path, comments: list[dict], tags: list[str]) -> None:
+    """Write the representer files."""
+    if not output_path.exists():
+        output_path.mkdir(parents=True, exist_ok=True)
+
+    (output_path / "tags.json").write_text(json.dumps({"tags": tags}, indent=2) + "\n")
+    (output_path / "analysis.json").write_text(json.dumps({"comments": comments}, indent=2, sort_keys=True) + "\n")
+
+
+def arg_parser() -> argparse.ArgumentParser:
+    """Return an ArgumentParser."""
+    parser = argparse.ArgumentParser()
+    parser.add_argument("slug")
+    parser.add_argument("input_dir")
+    parser.add_argument("output_dir")
+    return parser
+
+
+def main() -> None:
+    """Generate a representation."""
+    args = arg_parser().parse_args()
+    slug = args.slug
+    input_path = pathlib.Path(args.input_dir)
+    output_path = pathlib.Path(args.output_dir)
+
+    print(f"== Analyzing {args.slug!r} ==")
+    comments = []
+    config = gdlintrc()
+    for solution_file in solution_files(slug, input_path):
+        comments.extend(format_comments(solution_file, gdtoolkit.linter.lint_code(solution_file.read_text())))
+
+    tags = []
+
+    write_output(output_path, comments, tags)
+    print(f"== Done {args.slug!r} ==")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/bin/run.sh b/bin/run.sh
index dd5f056..51bb0c0 100755
--- a/bin/run.sh
+++ b/bin/run.sh
@@ -15,28 +15,4 @@
 # Example:
 # ./bin/run.sh two-fer path/to/solution/folder/ path/to/output/directory/
 
-# If any required arguments is missing, print the usage and exit
-if [ -z "$1" ] || [ -z "$2" ] || [ -z "$3" ]; then
-    echo "usage: ./bin/run.sh exercise-slug path/to/solution/folder/ path/to/output/directory/"
-    exit 1
-fi
-
-slug="$1"
-solution_dir=$(realpath "${2%/}")
-output_dir=$(realpath "${3%/}")
-analysis_file="${output_dir}/analysis.json"
-tags_file="${output_dir}/tags.json"
-
-# Create the output directory if it doesn't exist
-mkdir -p "${output_dir}"
-
-echo "${slug}: analyzing..."
-
-# Analyze the solution
-# TODO: replace the below command with your own command(s) 
-# to analyze the solution and output the analysis.json and
-# tags.json files
-echo '{"comments": []}' > "${analysis_file}"
-echo '{"tags": []}' > "${tags_file}"
-
-echo "${slug}: done"
+python3 "${0%.*}.py" "$@"
diff --git a/gdlintrc b/gdlintrc
new file mode 100644
index 0000000..5f41e41
--- /dev/null
+++ b/gdlintrc
@@ -0,0 +1,47 @@
+class-definitions-order:
+- tools
+- classnames
+- extends
+- docstrings
+- signals
+- enums
+- consts
+- staticvars
+- exports
+- pubvars
+- prvvars
+- onreadypubvars
+- onreadyprvvars
+- others
+class-load-variable-name: (([A-Z][a-z0-9]*)+|_?[a-z][a-z0-9]*(_[a-z0-9]+)*)
+class-name: ([A-Z][a-z0-9]*)+
+class-variable-name: _?[a-z][a-z0-9]*(_[a-z0-9]+)*
+comparison-with-itself: null
+constant-name: _?[A-Z][A-Z0-9]*(_[A-Z0-9]+)*
+disable: []
+duplicated-load: null
+enum-element-name: '[A-Z][A-Z0-9]*(_[A-Z0-9]+)*'
+enum-name: ([A-Z][a-z0-9]*)+
+excluded_directories: !!set
+  .git: null
+expression-not-assigned: null
+function-argument-name: _?[a-z][a-z0-9]*(_[a-z0-9]+)*
+function-arguments-number: 10
+function-name: (_on_([A-Z][a-z0-9]*)+(_[a-z0-9]+)*|_?[a-z][a-z0-9]*(_[a-z0-9]+)*)
+function-preload-variable-name: ([A-Z][a-z0-9]*)+
+function-variable-name: '[a-z][a-z0-9]*(_[a-z0-9]+)*'
+load-constant-name: (([A-Z][a-z0-9]*)+|_?[A-Z][A-Z0-9]*(_[A-Z0-9]+)*)
+loop-variable-name: _?[a-z][a-z0-9]*(_[a-z0-9]+)*
+max-file-lines: 1000
+max-line-length: 120
+max-public-methods: 100
+max-returns: 8
+mixed-tabs-and-spaces: null
+no-elif-return: null
+no-else-return: null
+signal-name: '[a-z][a-z0-9]*(_[a-z0-9]+)*'
+sub-class-name: _?([A-Z][a-z0-9]*)+
+tab-characters: 1
+trailing-whitespace: null
+unnecessary-pass: null
+unused-argument: null
diff --git a/tests/else-return/else_return.gd b/tests/else-return/else_return.gd
new file mode 100644
index 0000000..b71cb1a
--- /dev/null
+++ b/tests/else-return/else_return.gd
@@ -0,0 +1,7 @@
+func foo(a):
+	if a == 1:
+		return "One"
+	elif a == 2:
+		return "Two"
+	else:
+		return "Three"
diff --git a/tests/else-return/expected_analysis.json b/tests/else-return/expected_analysis.json
new file mode 100644
index 0000000..21597bb
--- /dev/null
+++ b/tests/else-return/expected_analysis.json
@@ -0,0 +1,24 @@
+{
+  "comments": [
+    {
+      "comment": "gdscript.gdlint.finding",
+      "params": {
+        "column": 2,
+        "description": "Unnecessary \"elif\" after \"return\"",
+        "file": "else_return.gd",
+        "line": 4,
+        "name": "no-elif-return"
+      }
+    },
+    {
+      "comment": "gdscript.gdlint.finding",
+      "params": {
+        "column": 2,
+        "description": "Unnecessary \"else\" after \"return\"",
+        "file": "else_return.gd",
+        "line": 6,
+        "name": "no-else-return"
+      }
+    }
+  ]
+}
diff --git a/tests/else-return/expected_tags.json b/tests/else-return/expected_tags.json
new file mode 100644
index 0000000..8468624
--- /dev/null
+++ b/tests/else-return/expected_tags.json
@@ -0,0 +1,3 @@
+{
+  "tags": []
+}
diff --git a/tests/naming/expected_analysis.json b/tests/naming/expected_analysis.json
new file mode 100644
index 0000000..07a4dcd
--- /dev/null
+++ b/tests/naming/expected_analysis.json
@@ -0,0 +1,34 @@
+{
+  "comments": [
+    {
+      "comment": "gdscript.gdlint.finding",
+      "params": {
+        "column": 6,
+        "description": "Function name \"Foo\" is not valid",
+        "file": "naming.gd",
+        "line": 3,
+        "name": "function-name"
+      }
+    },
+    {
+      "comment": "gdscript.gdlint.finding",
+      "params": {
+        "column": 6,
+        "description": "Function-scope variable name \"Name\" is not valid",
+        "file": "naming.gd",
+        "line": 4,
+        "name": "function-variable-name"
+      }
+    },
+    {
+      "comment": "gdscript.gdlint.finding",
+      "params": {
+        "column": 7,
+        "description": "Constant name \"Five\" is not valid",
+        "file": "naming.gd",
+        "line": 1,
+        "name": "constant-name"
+      }
+    }
+  ]
+}
diff --git a/tests/naming/expected_tags.json b/tests/naming/expected_tags.json
new file mode 100644
index 0000000..8468624
--- /dev/null
+++ b/tests/naming/expected_tags.json
@@ -0,0 +1,3 @@
+{
+  "tags": []
+}
diff --git a/tests/naming/naming.gd b/tests/naming/naming.gd
new file mode 100644
index 0000000..8a1a755
--- /dev/null
+++ b/tests/naming/naming.gd
@@ -0,0 +1,4 @@
+const Five = 5
+
+func Foo():
+	var Name = "bob"
diff --git a/tests/no-comments/expected_analysis.json b/tests/no-comments/expected_analysis.json
index ec7c5c2..a0d0268 100644
--- a/tests/no-comments/expected_analysis.json
+++ b/tests/no-comments/expected_analysis.json
@@ -1 +1,3 @@
-{"comments": []}
+{
+  "comments": []
+}
diff --git a/tests/no-comments/expected_tags.json b/tests/no-comments/expected_tags.json
index c3f6273..8468624 100644
--- a/tests/no-comments/expected_tags.json
+++ b/tests/no-comments/expected_tags.json
@@ -1 +1,3 @@
-{"tags": []}
+{
+  "tags": []
+}
diff --git a/tests/no-comments/no_comments.gd b/tests/no-comments/no_comments.gd
new file mode 100644
index 0000000..0d59bd4
--- /dev/null
+++ b/tests/no-comments/no_comments.gd
@@ -0,0 +1,2 @@
+func foo():
+	return 1
diff --git a/tests/trailing-whitespace/expected_analysis.json b/tests/trailing-whitespace/expected_analysis.json
new file mode 100644
index 0000000..313b52b
--- /dev/null
+++ b/tests/trailing-whitespace/expected_analysis.json
@@ -0,0 +1,14 @@
+{
+  "comments": [
+    {
+      "comment": "gdscript.gdlint.finding",
+      "params": {
+        "column": 0,
+        "description": "Trailing whitespace(s)",
+        "file": "trailing_whitespace.gd",
+        "line": 2,
+        "name": "trailing-whitespace"
+      }
+    }
+  ]
+}
diff --git a/tests/trailing-whitespace/expected_tags.json b/tests/trailing-whitespace/expected_tags.json
new file mode 100644
index 0000000..8468624
--- /dev/null
+++ b/tests/trailing-whitespace/expected_tags.json
@@ -0,0 +1,3 @@
+{
+  "tags": []
+}
diff --git a/tests/trailing-whitespace/trailing_whitespace.gd b/tests/trailing-whitespace/trailing_whitespace.gd
new file mode 100644
index 0000000..b498fd8
--- /dev/null
+++ b/tests/trailing-whitespace/trailing_whitespace.gd
@@ -0,0 +1,2 @@
+func foo():
+	return 1  
diff --git a/tests/unused-arg/expected_analysis.json b/tests/unused-arg/expected_analysis.json
new file mode 100644
index 0000000..8dd9552
--- /dev/null
+++ b/tests/unused-arg/expected_analysis.json
@@ -0,0 +1,14 @@
+{
+  "comments": [
+    {
+      "comment": "gdscript.gdlint.finding",
+      "params": {
+        "column": 10,
+        "description": "unused function argument 'bob'",
+        "file": "unused_arg.gd",
+        "line": 1,
+        "name": "unused-argument"
+      }
+    }
+  ]
+}
diff --git a/tests/unused-arg/expected_tags.json b/tests/unused-arg/expected_tags.json
new file mode 100644
index 0000000..8468624
--- /dev/null
+++ b/tests/unused-arg/expected_tags.json
@@ -0,0 +1,3 @@
+{
+  "tags": []
+}
diff --git a/tests/unused-arg/unused_arg.gd b/tests/unused-arg/unused_arg.gd
new file mode 100644
index 0000000..81b1d30
--- /dev/null
+++ b/tests/unused-arg/unused_arg.gd
@@ -0,0 +1,2 @@
+func foo(bob):
+	return 1