diff --git a/MLX Code Tests/EditToolTests.swift b/MLX Code Tests/EditToolTests.swift
new file mode 100644
index 0000000..be68f37
--- /dev/null
+++ b/MLX Code Tests/EditToolTests.swift	
@@ -0,0 +1,188 @@
+//
+//  EditToolTests.swift
+//  MLX Code Tests
+//
+//  Unit tests for EditTool: exact-string file edits, uniqueness enforcement,
+//  multi-edit application, backup creation, changed-line counting, and the
+//  EditError surface. These exercise the deterministic edit-application logic
+//  that mutates user files, so correctness here is security/data-integrity
+//  critical. All I/O is confined to a per-test temp directory.
+//
+//  Created by Jordan Koch.
+//
+
+import XCTest
+@testable import MLX_Code
+
+final class EditToolTests: XCTestCase {
+
+    private var tempDir: URL!
+
+    override func setUpWithError() throws {
+        try super.setUpWithError()
+        tempDir = FileManager.default.temporaryDirectory
+            .appendingPathComponent("EditToolTests-\(UUID().uuidString)", isDirectory: true)
+        try FileManager.default.createDirectory(at: tempDir, withIntermediateDirectories: true)
+    }
+
+    override func tearDownWithError() throws {
+        if let tempDir = tempDir {
+            try? FileManager.default.removeItem(at: tempDir)
+        }
+        try super.tearDownWithError()
+    }
+
+    // MARK: - Helpers
+
+    private func writeFile(_ name: String, _ contents: String) throws -> String {
+        let path = tempDir.appendingPathComponent(name).path
+        try contents.write(toFile: path, atomically: true, encoding: .utf8)
+        return path
+    }
+
+    private func read(_ path: String) throws -> String {
+        try String(contentsOfFile: path, encoding: .utf8)
+    }
+
+    // MARK: - Single Edit
+
+    func testEditReplacesUniqueString() async throws {
+        let path = try writeFile("a.txt", "hello world\nsecond line\n")
+
+        let result = try await EditTool.shared.edit(
+            filePath: path, oldString: "hello world", newString: "goodbye world")
+
+        XCTAssertTrue(result.success)
+        XCTAssertEqual(result.filePath, path)
+        XCTAssertEqual(try read(path), "goodbye world\nsecond line\n",
+            "Only the matched substring should be replaced")
+    }
+
+    func testEditCreatesBackupWithOriginalContents() async throws {
+        let original = "let x = 1\nlet y = 2\n"
+        let path = try writeFile("b.swift", original)
+
+        let result = try await EditTool.shared.edit(
+            filePath: path, oldString: "let x = 1", newString: "let x = 42")
+
+        XCTAssertFalse(result.backupPath.isEmpty, "A backup path should be returned")
+        XCTAssertTrue(FileManager.default.fileExists(atPath: result.backupPath),
+            "Backup file should exist on disk")
+        XCTAssertEqual(try read(result.backupPath), original,
+            "Backup should preserve the pre-edit contents exactly")
+    }
+
+    func testEditThrowsWhenFileMissing() async {
+        let missing = tempDir.appendingPathComponent("does-not-exist.txt").path
+        do {
+            _ = try await EditTool.shared.edit(
+                filePath: missing, oldString: "a", newString: "b")
+            XCTFail("Editing a missing file should throw")
+        } catch let error as EditError {
+            guard case .fileNotFound = error else {
+                return XCTFail("Expected .fileNotFound, got \(error)")
+            }
+        } catch {
+            XCTFail("Expected EditError, got \(error)")
+        }
+    }
+
+    func testEditThrowsWhenStringNotFound() async throws {
+        let path = try writeFile("c.txt", "the quick brown fox")
+        do {
+            _ = try await EditTool.shared.edit(
+                filePath: path, oldString: "lazy dog", newString: "x")
+            XCTFail("Missing search string should throw")
+        } catch let error as EditError {
+            guard case .stringNotFound = error else {
+                return XCTFail("Expected .stringNotFound, got \(error)")
+            }
+        }
+        XCTAssertEqual(try read(path), "the quick brown fox",
+            "File must be untouched when the edit fails")
+    }
+
+    func testEditThrowsNotUniqueWhenAmbiguous() async throws {
+        let path = try writeFile("d.txt", "foo bar foo baz foo")
+        do {
+            _ = try await EditTool.shared.edit(
+                filePath: path, oldString: "foo", newString: "X")
+            XCTFail("Non-unique oldString without replaceAll should throw")
+        } catch let error as EditError {
+            guard case .notUnique(_, let count) = error else {
+                return XCTFail("Expected .notUnique, got \(error)")
+            }
+            XCTAssertEqual(count, 3, "Should report the true occurrence count")
+        }
+        XCTAssertEqual(try read(path), "foo bar foo baz foo",
+            "Ambiguous edit must not mutate the file")
+    }
+
+    func testEditReplaceAllReplacesEveryOccurrence() async throws {
+        let path = try writeFile("e.txt", "foo foo foo")
+
+        let result = try await EditTool.shared.edit(
+            filePath: path, oldString: "foo", newString: "bar", replaceAll: true)
+
+        XCTAssertTrue(result.success)
+        XCTAssertEqual(try read(path), "bar bar bar",
+            "replaceAll should replace all matches even when non-unique")
+    }
+
+    func testEditReportsChangedLineCount() async throws {
+        let path = try writeFile("f.txt", "line1\nline2\nline3\n")
+
+        let result = try await EditTool.shared.edit(
+            filePath: path, oldString: "line2", newString: "CHANGED")
+
+        XCTAssertEqual(result.linesChanged, 1,
+            "Changing content on a single line should count as one changed line")
+    }
+
+    // MARK: - Multi Edit
+
+    func testMultiEditAppliesAllEdits() async throws {
+        let path = try writeFile("g.txt", "alpha beta gamma")
+
+        let result = try await EditTool.shared.multiEdit(
+            filePath: path,
+            edits: [(old: "alpha", new: "1"), (old: "gamma", new: "3")])
+
+        XCTAssertTrue(result.success)
+        XCTAssertEqual(try read(path), "1 beta 3",
+            "All provided edits should be applied in order")
+    }
+
+    func testMultiEditIsAtomicOnMissingString() async throws {
+        let original = "one two three"
+        let path = try writeFile("h.txt", original)
+
+        do {
+            _ = try await EditTool.shared.multiEdit(
+                filePath: path,
+                edits: [(old: "one", new: "1"), (old: "NOPE", new: "x")])
+            XCTFail("multiEdit should throw when any oldString is absent")
+        } catch let error as EditError {
+            guard case .stringNotFound = error else {
+                return XCTFail("Expected .stringNotFound, got \(error)")
+            }
+        }
+        XCTAssertEqual(try read(path), original,
+            "No edits should be written if validation fails for any edit")
+    }
+
+    // MARK: - Error Surface
+
+    func testEditErrorDescriptions() {
+        XCTAssertEqual(
+            EditError.fileNotFound("/x/y").errorDescription,
+            "File not found: /x/y")
+        XCTAssertEqual(
+            EditError.notUnique("abc", 4).errorDescription,
+            "String appears 4 times (must be unique). Use replaceAll=true or provide more context.")
+        XCTAssertTrue(
+            EditError.stringNotFound("needle-in-haystack").errorDescription?
+                .contains("needle-in-haystack") ?? false,
+            "stringNotFound description should include (a prefix of) the missing string")
+    }
+}
diff --git a/MLX Code Tests/ToolParameterParsingTests.swift b/MLX Code Tests/ToolParameterParsingTests.swift
new file mode 100644
index 0000000..e851c15
--- /dev/null
+++ b/MLX Code Tests/ToolParameterParsingTests.swift	
@@ -0,0 +1,143 @@
+//
+//  ToolParameterParsingTests.swift
+//  MLX Code Tests
+//
+//  Unit tests for BaseTool's parameter extraction/validation helpers. Every
+//  concrete tool relies on these to coerce untrusted LLM-supplied argument
+//  dictionaries into typed values, so their required/default/type-mismatch
+//  behavior is high-risk and worth pinning down. Also covers the ToolError
+//  message surface these helpers throw.
+//
+//  Created by Jordan Koch.
+//
+
+import XCTest
+@testable import MLX_Code
+
+final class ToolParameterParsingTests: XCTestCase {
+
+    /// A minimal concrete BaseTool used only to reach the protected helpers.
+    private func makeTool() -> BaseTool {
+        BaseTool(
+            name: "test_tool",
+            description: "test",
+            parameters: ToolParameterSchema(properties: [:]))
+    }
+
+    // MARK: - validateParameters
+
+    func testValidateParametersPassesWhenPresent() throws {
+        let tool = makeTool()
+        XCTAssertNoThrow(
+            try tool.validateParameters(["a": 1, "b": "x"], required: ["a", "b"]))
+    }
+
+    func testValidateParametersThrowsMissing() {
+        let tool = makeTool()
+        XCTAssertThrowsError(
+            try tool.validateParameters(["a": 1], required: ["a", "b"])
+        ) { error in
+            guard case ToolError.missingParameter(let name) = error else {
+                return XCTFail("Expected .missingParameter, got \(error)")
+            }
+            XCTAssertEqual(name, "b")
+        }
+    }
+
+    // MARK: - stringParameter
+
+    func testStringParameterReturnsValue() throws {
+        let tool = makeTool()
+        XCTAssertEqual(try tool.stringParameter(["k": "hello"], key: "k"), "hello")
+    }
+
+    func testStringParameterUsesDefaultWhenMissing() throws {
+        let tool = makeTool()
+        XCTAssertEqual(
+            try tool.stringParameter([:], key: "k", default: "fallback"), "fallback")
+    }
+
+    func testStringParameterThrowsWhenMissingAndNoDefault() {
+        let tool = makeTool()
+        XCTAssertThrowsError(try tool.stringParameter([:], key: "k")) { error in
+            guard case ToolError.invalidParameterType(let key, let expected) = error else {
+                return XCTFail("Expected .invalidParameterType, got \(error)")
+            }
+            XCTAssertEqual(key, "k")
+            XCTAssertEqual(expected, "String")
+        }
+    }
+
+    func testStringParameterThrowsOnWrongType() {
+        let tool = makeTool()
+        // An Int value under the key is not a String and no default is provided.
+        XCTAssertThrowsError(try tool.stringParameter(["k": 123], key: "k"))
+    }
+
+    // MARK: - intParameter
+
+    func testIntParameterReturnsValue() throws {
+        let tool = makeTool()
+        XCTAssertEqual(try tool.intParameter(["n": 7], key: "n"), 7)
+    }
+
+    func testIntParameterUsesDefault() throws {
+        let tool = makeTool()
+        XCTAssertEqual(try tool.intParameter([:], key: "n", default: 42), 42)
+    }
+
+    func testIntParameterThrowsOnWrongTypeWithoutDefault() {
+        let tool = makeTool()
+        XCTAssertThrowsError(try tool.intParameter(["n": "notanint"], key: "n")) { error in
+            guard case ToolError.invalidParameterType = error else {
+                return XCTFail("Expected .invalidParameterType, got \(error)")
+            }
+        }
+    }
+
+    // MARK: - boolParameter
+
+    func testBoolParameterReturnsValue() throws {
+        let tool = makeTool()
+        XCTAssertTrue(try tool.boolParameter(["flag": true], key: "flag"))
+        XCTAssertFalse(try tool.boolParameter(["flag": false], key: "flag"))
+    }
+
+    func testBoolParameterUsesDefault() throws {
+        let tool = makeTool()
+        XCTAssertTrue(try tool.boolParameter([:], key: "flag", default: true))
+    }
+
+    // MARK: - arrayParameter
+
+    func testArrayParameterReturnsValue() throws {
+        let tool = makeTool()
+        let result = try tool.arrayParameter(["items": ["a", "b", "c"]], key: "items")
+        XCTAssertEqual(result.count, 3)
+    }
+
+    func testArrayParameterThrowsOnWrongType() {
+        let tool = makeTool()
+        XCTAssertThrowsError(try tool.arrayParameter(["items": "not-an-array"], key: "items")) { error in
+            guard case ToolError.invalidParameterType(let key, let expected) = error else {
+                return XCTFail("Expected .invalidParameterType, got \(error)")
+            }
+            XCTAssertEqual(key, "items")
+            XCTAssertEqual(expected, "Array")
+        }
+    }
+
+    // MARK: - ToolError message surface
+
+    func testToolErrorDescriptions() {
+        XCTAssertEqual(
+            ToolError.missingParameter("path").errorDescription,
+            "Missing required parameter: path")
+        XCTAssertEqual(
+            ToolError.invalidParameterType("count", expected: "Int").errorDescription,
+            "Invalid type for parameter 'count': expected Int")
+        XCTAssertEqual(
+            ToolError.notFound("/tmp/x").errorDescription,
+            "Resource not found: /tmp/x")
+    }
+}
diff --git a/MLX Code.xcodeproj/project.pbxproj b/MLX Code.xcodeproj/project.pbxproj
index f09b92e..d36af77 100644
--- a/MLX Code.xcodeproj/project.pbxproj	
+++ b/MLX Code.xcodeproj/project.pbxproj	
@@ -12,25 +12,19 @@
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@@ -544,6 +547,8 @@
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-				A3B4C5D6E7F8093A415C6D7E /* ModelSecurityValidatorTests.swift in Sources */,
-				A4B5C6D7E8F90A4B526D7E8F /* SessionManagerTests.swift in Sources */,
-				A5B6C7D8E9FA1B5C637E8F90 /* LogEntryTests.swift in Sources */,
+				FE01A1B2C3D4E5F607182930 /* ToolRegistryTests.swift in Sources */,
+				FE02A2B3C4D5E6F708293040 /* SlashCommandHandlerTests.swift in Sources */,
+				FE03A3B4C5D6E7F8093A4150 /* ModelSecurityValidatorTests.swift in Sources */,
+				FE04A4B5C6D7E8F90A4B5260 /* SessionManagerTests.swift in Sources */,
+				FE05A5B6C7D8E9FA1B5C6370 /* LogEntryTests.swift in Sources */,
 				A6B7C8D9EAFB2C6D748F90A1 /* ConversationManagerTests.swift in Sources */,
 				A7B8C9DAEBFC3D7E8590A1B2 /* NovaAPIRequestParsingTests.swift in Sources */,
 				A8B9CADBECED4E8F96A1B2C3 /* FrameTests.swift in Sources */,
+				7B6C49248D6994137006FF47 /* EditToolTests.swift in Sources */,
+				6EE067F6A165028C5C2ACBE4 /* ToolParameterParsingTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -962,9 +973,14 @@
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 				B9CADBECEBBE5F900A1324C5 /* GitHubPanelView.swift in Sources */,
 				BACBDCEDDCBF60011B2435D6 /* CodeAnalysisPanelView.swift in Sources */,
-				CA7398DCBE9DDF48B2F403A6 /* NovaAPIServer.swift in Sources */,
 				A79518FA8F80EE82D62C31CA /* PromptTemplates.swift in Sources */,
 				043C4E7F3FCA17ECD6EB1A51 /* PromptTemplatesView.swift in Sources */,
+				FBBADF005BEDA802394D5253 /* SessionManager.swift in Sources */,
+				FEA2C80E4E8D3CC0F66AA901 /* NovaAPIServer.swift in Sources */,
+				0E07D111D8BEFA7C457F735A /* UndoManager.swift in Sources */,
+				E4B3AB2E8C000164965C7E65 /* DiffView.swift in Sources */,
+				25E5A04C4FF7E10017DD8214 /* CommandPalette.swift in Sources */,
+				E47FE47735F21E314B227915 /* OnboardingView.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};