diff --git a/packages/opencode/src/patch/index.ts b/packages/opencode/src/patch/index.ts
index 0efeff544f6..b87ad555286 100644
--- a/packages/opencode/src/patch/index.ts
+++ b/packages/opencode/src/patch/index.ts
@@ -79,23 +79,23 @@ export namespace Patch {
     const line = lines[startIdx]
 
     if (line.startsWith("*** Add File:")) {
-      const filePath = line.split(":", 2)[1]?.trim()
+      const filePath = line.slice("*** Add File:".length).trim()
       return filePath ? { filePath, nextIdx: startIdx + 1 } : null
     }
 
     if (line.startsWith("*** Delete File:")) {
-      const filePath = line.split(":", 2)[1]?.trim()
+      const filePath = line.slice("*** Delete File:".length).trim()
       return filePath ? { filePath, nextIdx: startIdx + 1 } : null
     }
 
     if (line.startsWith("*** Update File:")) {
-      const filePath = line.split(":", 2)[1]?.trim()
+      const filePath = line.slice("*** Update File:".length).trim()
       let movePath: string | undefined
       let nextIdx = startIdx + 1
 
       // Check for move directive
       if (nextIdx < lines.length && lines[nextIdx].startsWith("*** Move to:")) {
-        movePath = lines[nextIdx].split(":", 2)[1]?.trim()
+        movePath = lines[nextIdx].slice("*** Move to:".length).trim()
         nextIdx++
       }
 
diff --git a/packages/opencode/src/snapshot/index.ts b/packages/opencode/src/snapshot/index.ts
index a1c2b57812e..c9a8f601c09 100644
--- a/packages/opencode/src/snapshot/index.ts
+++ b/packages/opencode/src/snapshot/index.ts
@@ -105,7 +105,7 @@ export namespace Snapshot {
         .split("\n")
         .map((x) => x.trim())
         .filter(Boolean)
-        .map((x) => path.join(Instance.worktree, x)),
+        .map((x) => path.join(Instance.worktree, x).replaceAll("\\", "/")),
     }
   }
 
diff --git a/packages/opencode/src/tool/apply_patch.ts b/packages/opencode/src/tool/apply_patch.ts
index 1344467c719..06293b6eba6 100644
--- a/packages/opencode/src/tool/apply_patch.ts
+++ b/packages/opencode/src/tool/apply_patch.ts
@@ -161,7 +161,7 @@ export const ApplyPatchTool = Tool.define("apply_patch", {
     // Build per-file metadata for UI rendering (used for both permission and result)
     const files = fileChanges.map((change) => ({
       filePath: change.filePath,
-      relativePath: path.relative(Instance.worktree, change.movePath ?? change.filePath),
+      relativePath: path.relative(Instance.worktree, change.movePath ?? change.filePath).replaceAll("\\", "/"),
       type: change.type,
       diff: change.diff,
       before: change.oldContent,
@@ -172,7 +172,7 @@ export const ApplyPatchTool = Tool.define("apply_patch", {
     }))
 
     // Check permissions if needed
-    const relativePaths = fileChanges.map((c) => path.relative(Instance.worktree, c.filePath))
+    const relativePaths = fileChanges.map((c) => path.relative(Instance.worktree, c.filePath).replaceAll("\\", "/"))
     await ctx.ask({
       permission: "edit",
       patterns: relativePaths,
@@ -242,13 +242,13 @@ export const ApplyPatchTool = Tool.define("apply_patch", {
     // Generate output summary
     const summaryLines = fileChanges.map((change) => {
       if (change.type === "add") {
-        return `A ${path.relative(Instance.worktree, change.filePath)}`
+        return `A ${path.relative(Instance.worktree, change.filePath).replaceAll("\\", "/")}`
       }
       if (change.type === "delete") {
-        return `D ${path.relative(Instance.worktree, change.filePath)}`
+        return `D ${path.relative(Instance.worktree, change.filePath).replaceAll("\\", "/")}`
       }
       const target = change.movePath ?? change.filePath
-      return `M ${path.relative(Instance.worktree, target)}`
+      return `M ${path.relative(Instance.worktree, target).replaceAll("\\", "/")}`
     })
     let output = `Success. Updated the following files:\n${summaryLines.join("\n")}`
 
@@ -264,7 +264,7 @@ export const ApplyPatchTool = Tool.define("apply_patch", {
         const limited = errors.slice(0, MAX_DIAGNOSTICS_PER_FILE)
         const suffix =
           errors.length > MAX_DIAGNOSTICS_PER_FILE ? `\n... and ${errors.length - MAX_DIAGNOSTICS_PER_FILE} more` : ""
-        output += `\n\nLSP errors detected in ${path.relative(Instance.worktree, target)}, please fix:\n<diagnostics file="${target}">\n${limited.map(LSP.Diagnostic.pretty).join("\n")}${suffix}\n</diagnostics>`
+        output += `\n\nLSP errors detected in ${path.relative(Instance.worktree, target).replaceAll("\\", "/")}, please fix:\n<diagnostics file="${target}">\n${limited.map(LSP.Diagnostic.pretty).join("\n")}${suffix}\n</diagnostics>`
       }
     }
 
diff --git a/packages/opencode/src/tool/bash.ts b/packages/opencode/src/tool/bash.ts
index 67559b78c08..6c9a7859d8d 100644
--- a/packages/opencode/src/tool/bash.ts
+++ b/packages/opencode/src/tool/bash.ts
@@ -145,7 +145,11 @@ export const BashTool = Tool.define("bash", async () => {
       }
 
       if (directories.size > 0) {
-        const globs = Array.from(directories).map((dir) => path.join(dir, "*"))
+        const globs = Array.from(directories).map((dir) => {
+          // Preserve POSIX-looking paths with /s, even on Windows
+          if (dir.startsWith("/")) return `${dir.replace(/[\\/]+$/, "")}/*`
+          return path.join(dir, "*")
+        })
         await ctx.ask({
           permission: "external_directory",
           patterns: globs,
diff --git a/packages/opencode/test/skill/skill.test.ts b/packages/opencode/test/skill/skill.test.ts
index c310256c5e7..2264723a090 100644
--- a/packages/opencode/test/skill/skill.test.ts
+++ b/packages/opencode/test/skill/skill.test.ts
@@ -50,7 +50,7 @@ Instructions here.
       const testSkill = skills.find((s) => s.name === "test-skill")
       expect(testSkill).toBeDefined()
       expect(testSkill!.description).toBe("A test skill for verification.")
-      expect(testSkill!.location).toContain("skill/test-skill/SKILL.md")
+      expect(testSkill!.location).toContain(path.join("skill", "test-skill", "SKILL.md"))
     },
   })
 })
@@ -180,7 +180,7 @@ description: A skill in the .claude/skills directory.
       expect(skills.length).toBe(1)
       const claudeSkill = skills.find((s) => s.name === "claude-skill")
       expect(claudeSkill).toBeDefined()
-      expect(claudeSkill!.location).toContain(".claude/skills/claude-skill/SKILL.md")
+      expect(claudeSkill!.location).toContain(path.join(".claude", "skills", "claude-skill", "SKILL.md"))
     },
   })
 })
@@ -200,7 +200,7 @@ test("discovers global skills from ~/.claude/skills/ directory", async () => {
         expect(skills.length).toBe(1)
         expect(skills[0].name).toBe("global-test-skill")
         expect(skills[0].description).toBe("A global skill from ~/.claude/skills for testing.")
-        expect(skills[0].location).toContain(".claude/skills/global-test-skill/SKILL.md")
+        expect(skills[0].location).toContain(path.join(".claude", "skills", "global-test-skill", "SKILL.md"))
       },
     })
   } finally {
@@ -245,7 +245,7 @@ description: A skill in the .agents/skills directory.
       expect(skills.length).toBe(1)
       const agentSkill = skills.find((s) => s.name === "agent-skill")
       expect(agentSkill).toBeDefined()
-      expect(agentSkill!.location).toContain(".agents/skills/agent-skill/SKILL.md")
+      expect(agentSkill!.location).toContain(path.join(".agents", "skills", "agent-skill", "SKILL.md"))
     },
   })
 })
@@ -279,7 +279,7 @@ This skill is loaded from the global home directory.
         expect(skills.length).toBe(1)
         expect(skills[0].name).toBe("global-agent-skill")
         expect(skills[0].description).toBe("A global skill from ~/.agents/skills for testing.")
-        expect(skills[0].location).toContain(".agents/skills/global-agent-skill/SKILL.md")
+        expect(skills[0].location).toContain(path.join(".agents", "skills", "global-agent-skill", "SKILL.md"))
       },
     })
   } finally {
diff --git a/packages/opencode/test/tool/apply_patch.test.ts b/packages/opencode/test/tool/apply_patch.test.ts
index a08e235885a..f81723fee09 100644
--- a/packages/opencode/test/tool/apply_patch.test.ts
+++ b/packages/opencode/test/tool/apply_patch.test.ts
@@ -93,6 +93,13 @@ describe("tool.apply_patch freeform", () => {
 
         expect(result.title).toContain("Success. Updated the following files")
         expect(result.output).toContain("Success. Updated the following files")
+        // Strict formatting assertions for slashes
+        expect(result.output).toMatch(/A nested\/new\.txt/)
+        expect(result.output).toMatch(/D delete\.txt/)
+        expect(result.output).toMatch(/M modify\.txt/)
+        if (process.platform === "win32") {
+          expect(result.output).not.toContain("\\")
+        }
         expect(result.metadata.diff).toContain("Index:")
         expect(calls.length).toBe(1)