diff --git a/.github/workflows/claude-code-review.yml b/.github/workflows/claude-code-review.yml
index 9adfd52..b5e8cfd 100644
--- a/.github/workflows/claude-code-review.yml
+++ b/.github/workflows/claude-code-review.yml
@@ -17,14 +17,14 @@ jobs:
     #   github.event.pull_request.user.login == 'external-contributor' ||
     #   github.event.pull_request.user.login == 'new-developer' ||
     #   github.event.pull_request.author_association == 'FIRST_TIME_CONTRIBUTOR'
-    
+
     runs-on: ubuntu-latest
     permissions:
       contents: read
       pull-requests: read
       issues: read
       id-token: write
-    
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
@@ -36,19 +36,9 @@ jobs:
         uses: anthropics/claude-code-action@v1
         with:
           claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
-          allowed_bots: 'codefactor-io[bot]'
-          prompt: |
-            Please review this pull request and provide feedback on:
-            - Code quality and best practices
-            - Potential bugs or issues
-            - Performance considerations
-            - Security concerns
-            - Test coverage
-            
-            Use the repository's CLAUDE.md for guidance on style and conventions. Be constructive and helpful in your feedback.
-
-            Use `gh pr comment` with your Bash tool to leave your review as a comment on the PR.
-          
+          plugin_marketplaces: 'https://github.com/anthropics/claude-code.git'
+          plugins: 'code-review@claude-code-plugins'
+          prompt: '/code-review:code-review ${{ github.repository }}/pull/${{ github.event.pull_request.number }}'
           # See https://github.com/anthropics/claude-code-action/blob/main/docs/usage.md
-          # or https://docs.anthropic.com/en/docs/claude-code/sdk#command-line for available options
-          claude_args: '--model sonnet --allowed-tools "Bash(gh issue view:*),Bash(gh search:*),Bash(gh issue list:*),Bash(gh pr comment:*),Bash(gh pr diff:*),Bash(gh pr view:*),Bash(gh pr list:*)"'
\ No newline at end of file
+          # or https://code.claude.com/docs/en/cli-reference for available options
+
diff --git a/.github/workflows/claude.yml b/.github/workflows/claude.yml
index d300267..6b15fac 100644
--- a/.github/workflows/claude.yml
+++ b/.github/workflows/claude.yml
@@ -46,5 +46,5 @@ jobs:
           # Optional: Add claude_args to customize behavior and configuration
           # See https://github.com/anthropics/claude-code-action/blob/main/docs/usage.md
           # or https://code.claude.com/docs/en/cli-reference for available options
-          # claude_args: '--allowed-tools Bash(gh pr:*)'
+          # claude_args: '--allowed-tools Bash(gh pr *)'
 
diff --git a/Sources/ConfigKeyKit/ConfigValueReading.swift b/Sources/ConfigKeyKit/ConfigValueReading.swift
new file mode 100644
index 0000000..c57a6d0
--- /dev/null
+++ b/Sources/ConfigKeyKit/ConfigValueReading.swift
@@ -0,0 +1,164 @@
+//
+//  ConfigValueReading.swift
+//  ConfigKeyKit
+//
+//  Created by Leo Dion.
+//  Copyright © 2026 BrightDigit.
+//
+//  Permission is hereby granted, free of charge, to any person
+//  obtaining a copy of this software and associated documentation
+//  files (the "Software"), to deal in the Software without
+//  restriction, including without limitation the rights to use,
+//  copy, modify, merge, publish, distribute, sublicense, and/or
+//  sell copies of the Software, and to permit persons to whom the
+//  Software is furnished to do so, subject to the following
+//  conditions:
+//
+//  The above copyright notice and this permission notice shall be
+//  included in all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+//  OTHER DEALINGS IN THE SOFTWARE.
+//
+
+public import Foundation
+
+/// A reader that resolves ``ConfigKey`` / ``OptionalConfigKey`` values across
+/// every ``ConfigKeySource`` in precedence order.
+///
+/// This protocol holds the source-precedence resolution that downstream
+/// consumers previously hand-wrote as an `extension ConfigReader { read(_:) }`
+/// (see issue #1, "Remove Need for Extension"). The logic lives here, in
+/// ConfigKeyKit's Foundation-only core, so it is shared and unit-testable with a
+/// trivial mock — no configuration framework required.
+///
+/// The three primitive requirements mirror the read surface of
+/// `swift-configuration`'s `ConfigReader` exactly, so a consumer conforms in a
+/// single line:
+///
+/// ```swift
+/// extension ConfigReader: @retroactive ConfigValueReading {
+///   public func makeConfigKey(_ s: String) -> Configuration.ConfigKey { .init(s) }
+/// }
+/// ```
+///
+/// `string(forKey:isSecret:fileID:line:)`, `int(...)`, and `double(...)` are
+/// then witnessed by `ConfigReader`'s own methods, and ``Key`` infers to
+/// `Configuration.ConfigKey`.
+public protocol ConfigValueReading {
+  /// The reader's native key type (e.g. `Configuration.ConfigKey`).
+  associatedtype Key
+
+  /// Builds a native ``Key`` from a resolved per-source key string.
+  func makeConfigKey(_ string: String) -> Key
+
+  /// Reads a string value for the native key, or `nil` if absent.
+  func string(forKey key: Key, isSecret: Bool, fileID: String, line: UInt) -> String?
+
+  /// Reads an integer value for the native key, or `nil` if absent.
+  func int(forKey key: Key, isSecret: Bool, fileID: String, line: UInt) -> Int?
+
+  /// Reads a double value for the native key, or `nil` if absent.
+  func double(forKey key: Key, isSecret: Bool, fileID: String, line: UInt) -> Double?
+}
+
+extension ConfigValueReading {
+  /// Reads a required string value: CLI → ENV → the key's default.
+  public func read(_ key: ConfigKey<String>) -> String {
+    resolvedString(key) ?? key.defaultValue
+  }
+
+  /// Reads a required double value: CLI → ENV → the key's default.
+  public func read(_ key: ConfigKey<Double>) -> Double {
+    resolvedDouble(key) ?? key.defaultValue
+  }
+
+  /// Reads a required boolean value.
+  ///
+  /// - CLI: flag presence indicates `true` (e.g. `--verbose`).
+  /// - ENV: accepts `true` / `1` / `yes` (case-insensitive); empty is absent.
+  /// - Otherwise the key's default.
+  public func read(_ key: ConfigKey<Bool>) -> Bool {
+    if let cli = key.key(for: .commandLine),
+      string(forKey: makeConfigKey(cli), isSecret: false, fileID: #fileID, line: #line) != nil
+    {
+      return true
+    }
+    if let env = key.key(for: .environment),
+      let value = string(
+        forKey: makeConfigKey(env), isSecret: false, fileID: #fileID, line: #line
+      )
+    {
+      let normalized = value.lowercased().trimmingCharacters(in: .whitespaces)
+      return normalized == "true" || normalized == "1" || normalized == "yes"
+    }
+    return key.defaultValue
+  }
+
+  /// Reads an optional string value: CLI → ENV → `nil`.
+  public func read(_ key: OptionalConfigKey<String>) -> String? {
+    resolvedString(key)
+  }
+
+  /// Reads an optional integer value: CLI → ENV → `nil`.
+  public func read(_ key: OptionalConfigKey<Int>) -> Int? {
+    resolvedInt(key)
+  }
+
+  /// Reads an optional double value: CLI → ENV → `nil`.
+  public func read(_ key: OptionalConfigKey<Double>) -> Double? {
+    resolvedDouble(key)
+  }
+
+  /// Reads an optional ISO8601 date value: CLI → ENV → `nil`.
+  public func read(_ key: OptionalConfigKey<Date>) -> Date? {
+    guard let value = resolvedString(key) else {
+      return nil
+    }
+    return ISO8601DateFormatter().date(from: value)
+  }
+
+  // MARK: - Source-precedence resolution
+
+  private func resolvedString(_ key: any ConfigurationKey) -> String? {
+    for source in ConfigKeySource.allCases {
+      guard let keyString = key.key(for: source) else { continue }
+      if let value = string(
+        forKey: makeConfigKey(keyString), isSecret: false, fileID: #fileID, line: #line
+      ) {
+        return value
+      }
+    }
+    return nil
+  }
+
+  private func resolvedInt(_ key: any ConfigurationKey) -> Int? {
+    for source in ConfigKeySource.allCases {
+      guard let keyString = key.key(for: source) else { continue }
+      if let value = int(
+        forKey: makeConfigKey(keyString), isSecret: false, fileID: #fileID, line: #line
+      ) {
+        return value
+      }
+    }
+    return nil
+  }
+
+  private func resolvedDouble(_ key: any ConfigurationKey) -> Double? {
+    for source in ConfigKeySource.allCases {
+      guard let keyString = key.key(for: source) else { continue }
+      if let value = double(
+        forKey: makeConfigKey(keyString), isSecret: false, fileID: #fileID, line: #line
+      ) {
+        return value
+      }
+    }
+    return nil
+  }
+}
diff --git a/Tests/ConfigKeyKitTests/ConfigValueReadingTests.swift b/Tests/ConfigKeyKitTests/ConfigValueReadingTests.swift
new file mode 100644
index 0000000..1286741
--- /dev/null
+++ b/Tests/ConfigKeyKitTests/ConfigValueReadingTests.swift
@@ -0,0 +1,117 @@
+//
+//  ConfigValueReadingTests.swift
+//  ConfigKeyKit
+//
+//  Created by Leo Dion.
+//  Copyright © 2026 BrightDigit.
+//
+//  Permission is hereby granted, free of charge, to any person
+//  obtaining a copy of this software and associated documentation
+//  files (the "Software"), to deal in the Software without
+//  restriction, including without limitation the rights to use,
+//  copy, modify, merge, publish, distribute, sublicense, and/or
+//  sell copies of the Software, and to permit persons to whom the
+//  Software is furnished to do so, subject to the following
+//  conditions:
+//
+//  The above copyright notice and this permission notice shall be
+//  included in all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+//  OTHER DEALINGS IN THE SOFTWARE.
+//
+
+import Foundation
+import Testing
+
+@testable import ConfigKeyKit
+
+@Suite("ConfigValueReading Tests")
+internal struct ConfigValueReadingTests {
+  private let key = ConfigKey("base-url", envPrefix: "BRIGHTDIGIT", default: "default-url")
+
+  @Test("Required string: CLI wins over ENV")
+  internal func requiredStringCLIPrecedence() throws {
+    let cli = try #require(key.key(for: .commandLine))
+    let env = try #require(key.key(for: .environment))
+    let reader = MockConfigValueReader(strings: [cli: "from-cli", env: "from-env"])
+    #expect(reader.read(key) == "from-cli")
+  }
+
+  @Test("Required string: ENV used when CLI absent")
+  internal func requiredStringENVFallback() throws {
+    let env = try #require(key.key(for: .environment))
+    let reader = MockConfigValueReader(strings: [env: "from-env"])
+    #expect(reader.read(key) == "from-env")
+  }
+
+  @Test("Required string: default used when neither source present")
+  internal func requiredStringDefault() {
+    #expect(MockConfigValueReader().read(key) == "default-url")
+  }
+
+  @Test("Required bool: CLI flag presence is true")
+  internal func boolCLIPresence() throws {
+    let boolKey = ConfigKey("verbose", envPrefix: "BRIGHTDIGIT", default: false)
+    let cli = try #require(boolKey.key(for: .commandLine))
+    let reader = MockConfigValueReader(strings: [cli: ""])
+    #expect(reader.read(boolKey) == true)
+  }
+
+  @Test(
+    "Required bool: ENV truthy strings",
+    arguments: [("true", true), ("1", true), ("YES", true), ("false", false), ("0", false)]
+  )
+  internal func boolENVParsing(value: String, expected: Bool) throws {
+    let boolKey = ConfigKey("verbose", envPrefix: "BRIGHTDIGIT", default: false)
+    let env = try #require(boolKey.key(for: .environment))
+    let reader = MockConfigValueReader(strings: [env: value])
+    #expect(reader.read(boolKey) == expected)
+  }
+
+  @Test("Required bool: default when absent")
+  internal func boolDefault() {
+    let boolKey = ConfigKey("verbose", envPrefix: "BRIGHTDIGIT", default: true)
+    #expect(MockConfigValueReader().read(boolKey) == true)
+  }
+
+  @Test("Optional int: parsed with precedence, nil when absent")
+  internal func optionalInt() throws {
+    let intKey = OptionalConfigKey<Int>("episode-number", envPrefix: "BRIGHTDIGIT")
+    let cli = try #require(intKey.key(for: .commandLine))
+    let reader = MockConfigValueReader(ints: [cli: 42])
+    #expect(reader.read(intKey) == 42)
+    #expect(MockConfigValueReader().read(intKey) == nil)
+  }
+
+  @Test("Optional double: parsed, nil when absent")
+  internal func optionalDouble() throws {
+    let doubleKey = OptionalConfigKey<Double>("min-interval", envPrefix: "BRIGHTDIGIT")
+    let env = try #require(doubleKey.key(for: .environment))
+    let reader = MockConfigValueReader(doubles: [env: 1.5])
+    #expect(reader.read(doubleKey) == 1.5)
+    #expect(MockConfigValueReader().read(doubleKey) == nil)
+  }
+
+  @Test("Optional string: nil when absent")
+  internal func optionalStringNil() {
+    let optKey = OptionalConfigKey<String>("episode-title", envPrefix: "BRIGHTDIGIT")
+    #expect(MockConfigValueReader().read(optKey) == nil)
+  }
+
+  @Test("Optional date: ISO8601 parsed from value")
+  internal func optionalDate() throws {
+    let dateKey = OptionalConfigKey<Date>("published-at", envPrefix: "BRIGHTDIGIT")
+    let iso = "2026-06-17T00:00:00Z"
+    let cli = try #require(dateKey.key(for: .commandLine))
+    let reader = MockConfigValueReader(strings: [cli: iso])
+    #expect(reader.read(dateKey) == ISO8601DateFormatter().date(from: iso))
+    #expect(MockConfigValueReader().read(dateKey) == nil)
+  }
+}
diff --git a/Tests/ConfigKeyKitTests/MockConfigValueReader.swift b/Tests/ConfigKeyKitTests/MockConfigValueReader.swift
new file mode 100644
index 0000000..322242b
--- /dev/null
+++ b/Tests/ConfigKeyKitTests/MockConfigValueReader.swift
@@ -0,0 +1,59 @@
+//
+//  MockConfigValueReader.swift
+//  ConfigKeyKit
+//
+//  Created by Leo Dion.
+//  Copyright © 2026 BrightDigit.
+//
+//  Permission is hereby granted, free of charge, to any person
+//  obtaining a copy of this software and associated documentation
+//  files (the "Software"), to deal in the Software without
+//  restriction, including without limitation the rights to use,
+//  copy, modify, merge, publish, distribute, sublicense, and/or
+//  sell copies of the Software, and to permit persons to whom the
+//  Software is furnished to do so, subject to the following
+//  conditions:
+//
+//  The above copyright notice and this permission notice shall be
+//  included in all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+//  OTHER DEALINGS IN THE SOFTWARE.
+//
+
+@testable import ConfigKeyKit
+
+/// Dict-backed ``ConfigValueReading`` keyed by the exact per-source key strings
+/// that `ConfigKey` / `OptionalConfigKey` produce, so the shared `read(_:)`
+/// resolution can be exercised without any configuration framework.
+internal struct MockConfigValueReader: ConfigValueReading {
+  internal var strings: [String: String] = [:]
+  internal var ints: [String: Int] = [:]
+  internal var doubles: [String: Double] = [:]
+
+  internal func makeConfigKey(_ string: String) -> String { string }
+
+  internal func string(
+    forKey key: String, isSecret _: Bool, fileID _: String, line _: UInt
+  ) -> String? {
+    strings[key]
+  }
+
+  internal func int(
+    forKey key: String, isSecret _: Bool, fileID _: String, line _: UInt
+  ) -> Int? {
+    ints[key]
+  }
+
+  internal func double(
+    forKey key: String, isSecret _: Bool, fileID _: String, line _: UInt
+  ) -> Double? {
+    doubles[key]
+  }
+}