diff --git a/.github/problem-matchers/README.md b/.github/problem-matchers/README.md
new file mode 100644
index 00000000000..93dd1600356
--- /dev/null
+++ b/.github/problem-matchers/README.md
@@ -0,0 +1,43 @@
+# Problem Matchers
+
+GitHub [Problem
+Matchers](https://github.com/actions/toolkit/blob/main/docs/problem-matchers.md)
+are a mechanism that enable workflow steps to scan the outputs of GitHub
+Actions for regex patterns and automatically write annotations in the workflow
+summary page. Using Problem Matchers allows information to be displayed more
+prominently in the GitHub user interface.
+
+This directory contains Problem Matchers used by the GitHub Actions workflows
+in the [`workflows`](./workflows) subdirectory.
+
+## Original sources
+
+The Pylint and YAML file problem matchers found in this directory were copied
+from the [Home Assistant](https://github.com/home-assistant/core) project on
+GitHub. The Home Assistant project is licensed under the Apache 2.0 open-source
+license. The version of the files at the time they were copied was 2025.1.2.
+
+-   [`pylint.json`](https://github.com/home-assistant/core/blob/dev/.github/workflows/matchers/pylint.json)
+-   [`yamllint.json`](https://github.com/home-assistant/core/blob/dev/.github/workflows/matchers/yamllint.json)
+
+The Mypy and Pytest problem matchers files originally came from the
+[gh-problem-matcher-wrap](https://github.com/liskin/gh-problem-matcher-wrap/tree/master/problem-matchers)
+repository (copied 2025-03-04, version 3.0.0), and were subsequently modified by
+Michael Hucka. The original JSON files are Copyright © 2020 Tomáš Janoušek and
+made available under the terms of the MIT license.
+
+-   [`mypy.json`](https://github.com/liskin/gh-problem-matcher-wrap/blob/master/problem-matchers/mypy.json)
+-   [`pytest.json`](https://github.com/liskin/gh-problem-matcher-wrap/blob/master/problem-matchers/pytest.json)
+
+The following problem matcher for Black came from a fork of the
+[MLflow](https://github.com/mlflow/mlflow) project by user Sumanth077 on GitHub.
+The MLflow project is licensed under the Apache 2.0 open-source license. The
+version of the file copied was dated 2022-05-29.
+
+-   [`black.json`](https://github.com/Sumanth077/mlflow/blob/problem-matcher-for-black/.github/workflows/matchers/black.json)
+
+The Shellcheck problem matcher JSON file came from the
+[shellcheck-problem-matchers](uhttps://github.com/lumaxis/shellcheck-problem-matchers)
+repository (copied 2025-02-26, version v2.1.0).
+
+-   [`shellcheck-tty.json`](https://github.com/lumaxis/shellcheck-problem-matchers/blob/main/.github/shellcheck-tty.json)
diff --git a/.github/problem-matchers/black.json b/.github/problem-matchers/black.json
new file mode 100644
index 00000000000..605f10c2706
--- /dev/null
+++ b/.github/problem-matchers/black.json
@@ -0,0 +1,15 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "black",
+      "severity": "error",
+      "pattern": [
+        {
+          "regexp": "^(would reformat) (.+)$",
+          "file": 2,
+          "message": 1
+        }
+      ]
+    }
+  ]
+}
diff --git a/.github/problem-matchers/mypy.json b/.github/problem-matchers/mypy.json
new file mode 100644
index 00000000000..0271692192e
--- /dev/null
+++ b/.github/problem-matchers/mypy.json
@@ -0,0 +1,19 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "mypy",
+      "severity": "error",
+      "pattern": [
+        {
+          "regexp": "^([^:]*):(\\d+):(?:(\\d+):)?\\s(error|warning): (.*?)(?:  \\[(\\S+)\\])?$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "severity": 4,
+          "message": 5,
+          "code": 6
+        }
+      ]
+    }
+  ]
+}
diff --git a/.github/problem-matchers/pylint.json b/.github/problem-matchers/pylint.json
new file mode 100644
index 00000000000..5624ca695c4
--- /dev/null
+++ b/.github/problem-matchers/pylint.json
@@ -0,0 +1,32 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "pylint-error",
+      "severity": "error",
+      "pattern": [
+        {
+          "regexp": "^(.+):(\\d+):(\\d+):\\s(([EF]\\d{4}):\\s.+)$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "message": 4,
+          "code": 5
+        }
+      ]
+    },
+    {
+      "owner": "pylint-warning",
+      "severity": "warning",
+      "pattern": [
+        {
+          "regexp": "^(.+):(\\d+):(\\d+):\\s(([CRW]\\d{4}):\\s.+)$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "message": 4,
+          "code": 5
+        }
+      ]
+    }
+  ]
+}
diff --git a/.github/problem-matchers/pytest.json b/.github/problem-matchers/pytest.json
new file mode 100644
index 00000000000..f6bbfba32e9
--- /dev/null
+++ b/.github/problem-matchers/pytest.json
@@ -0,0 +1,16 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "pytest",
+      "severity": "error",
+      "pattern": [
+        {
+          "regexp": "^(\\S+):(\\d+): (.*)$",
+          "file": 1,
+          "line": 2,
+          "message": 3
+        }
+      ]
+    }
+  ]
+}
diff --git a/.github/problem-matchers/shellcheck.json b/.github/problem-matchers/shellcheck.json
new file mode 100644
index 00000000000..aedb9ecf50e
--- /dev/null
+++ b/.github/problem-matchers/shellcheck.json
@@ -0,0 +1,24 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "shellcheck",
+      "pattern": [
+        {
+            "regexp": "^In\\s(.+)\\sline\\s(\\d+):$",
+            "file": 1,
+            "line": 2
+        },
+        {
+          "regexp": ".*"
+        },
+        {
+            "regexp": "SC(\\d+)(\\s\\((note|warning|error)\\))?:\\s(.+)$",
+            "code": 1,
+            "severity": 3,
+            "message": 4,
+            "loop": true
+        }
+      ]
+    }
+  ]
+}
diff --git a/.github/problem-matchers/yamllint.json b/.github/problem-matchers/yamllint.json
new file mode 100644
index 00000000000..ab9449dd77f
--- /dev/null
+++ b/.github/problem-matchers/yamllint.json
@@ -0,0 +1,22 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "yamllint",
+      "pattern": [
+        {
+          "regexp": "^(.*\\.ya?ml)$",
+          "file": 1
+        },
+        {
+          "regexp": "^\\s{2}(\\d+):(\\d+)\\s+(error|warning)\\s+(.*?)\\s+\\((.*)\\)$",
+          "line": 1,
+          "column": 2,
+          "severity": 3,
+          "message": 4,
+          "code": 5,
+          "loop": true
+        }
+      ]
+    }
+  ]
+}
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3d416989b3d..1ca42951a34 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -62,6 +62,8 @@ jobs:
           architecture: 'x64'
       - name: Install dependencies
         run: pip install -r dev_tools/requirements/deps/format.txt
+      - name: Set up problem matcher for Black output
+        run: echo '::add-matcher::.github/problem-matchers/black.json'
       - name: Format
         run: check/format-incremental
   mypy:
@@ -77,6 +79,8 @@ jobs:
           architecture: 'x64'
       - name: Install mypy
         run: pip install -r dev_tools/requirements/mypy.env.txt
+      - name: Set up problem matcher for Mypy output
+        run: echo '::add-matcher::.github/problem-matchers/mypy.json'
       - name: Type check
         run: check/mypy
   changed_files:
@@ -94,6 +98,8 @@ jobs:
           architecture: 'x64'
       - name: Install changed files test dependencies
         run: dev_tools/conf/pip-install-minimal-for-pytest-changed-files.sh
+      - name: Set up problem matcher for Pytest output
+        run: echo '::add-matcher::.github/problem-matchers/pytest.json'
       - name: Changed files test
         run: check/pytest-changed-files -n auto
   lint:
@@ -109,6 +115,8 @@ jobs:
           architecture: 'x64'
       - name: Install pylint
         run: pip install -r dev_tools/requirements/pylint.env.txt
+      - name: Set up problem matcher for Pylint output
+        run: echo '::add-matcher::.github/problem-matchers/pylint.json'
       - name: Display version
         run: check/pylint --version
       - name: Lint
@@ -151,6 +159,8 @@ jobs:
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
         with:
           fetch-depth: 0
+      - name: Set up problem matcher for Shellcheck output
+        run: echo '::add-matcher::.github/problem-matchers/shellcheck.json'
       - name: Run shellcheck
         run: check/shellcheck
   isolated-modules:
@@ -166,6 +176,8 @@ jobs:
           architecture: 'x64'
       - name: Install dependencies
         run: pip install -r dev_tools/requirements/isolated-base.env.txt
+      - name: Set up problem matcher for Pytest output
+        run: echo '::add-matcher::.github/problem-matchers/pytest.json'
       - name: Test each module in isolation
         run: pytest -n auto --enable-slow-tests dev_tools/packaging/isolated_packages_test.py
   pytest:
@@ -197,6 +209,8 @@ jobs:
           pip install --upgrade --upgrade-strategy eager -r dev_tools/requirements/dev.env.txt
       - name: Run Quil dependencies
         run: docker compose -f cirq-rigetti/docker-compose.test.yaml up -d
+      - name: Set up problem matcher for Pytest output
+        run: echo '::add-matcher::.github/problem-matchers/pytest.json'
       - name: Pytest check
         run: check/pytest -n auto --durations=20 --ignore=cirq-core/cirq/contrib --rigetti-integration
       - name: Stop Quil dependencies
@@ -229,6 +243,8 @@ jobs:
         run: |
           pip install wheel
           pip install --upgrade --upgrade-strategy eager -r dev_tools/requirements/dev-np2.env.txt
+      - name: Set up problem matcher for Pytest output
+        run: echo '::add-matcher::.github/problem-matchers/pytest.json'
       - name: Pytest check
         run: check/pytest -n auto --warn-numpy-data-promotion --durations=20 --ignore=cirq-rigetti
   pip-compile:
@@ -324,6 +340,8 @@ jobs:
         run: |
           pip install wheel
           pip install --upgrade --upgrade-strategy eager -r dev_tools/requirements/no-contrib.env.txt
+      - name: Set up problem matcher for Pytest output
+        run: echo '::add-matcher::.github/problem-matchers/pytest.json'
       - name: Pytest Windows
         run: |
           source dev_tools/pypath
@@ -352,6 +370,8 @@ jobs:
         run: |
           pip install wheel
           pip install --upgrade --upgrade-strategy eager -r dev_tools/requirements/no-contrib.env.txt
+      - name: Set up problem matcher for Pytest output
+        run: echo '::add-matcher::.github/problem-matchers/pytest.json'
       - name: Pytest check
         run: check/pytest -n auto --durations=20 --ignore=cirq-core/cirq/contrib
   notebooks-stable:
@@ -375,6 +395,8 @@ jobs:
           architecture: 'x64'
       - name: Install requirements
         run: pip install -r dev_tools/requirements/isolated-base.env.txt
+      - name: Set up problem matcher for Pytest output
+        run: echo '::add-matcher::.github/problem-matchers/pytest.json'
       - name: Notebook tests
         run: check/pytest -n auto -m slow dev_tools/notebooks/isolated_notebook_test.py -k ${{matrix.partition}}
       - name: Persist the outputs
@@ -396,6 +418,8 @@ jobs:
           architecture: 'x64'
       - name: Install requirements
         run: pip install -r dev_tools/requirements/notebooks.env.txt
+      - name: Set up problem matcher for Pytest output
+        run: echo '::add-matcher::.github/problem-matchers/pytest.json'
       - name: Notebook tests
         run: check/pytest -n auto -m slow dev_tools/notebooks/notebook_test.py
       - name: Persist the outputs