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@ammar-agent ammar-agent commented Oct 26, 2025

Design Decision

Change the instruction file loading behavior to read AGENTS.md from the project root instead of individual workspace directories.

Rationale

  • Consistency: Ensures consistent instructions across all workspaces for a project
  • Simplicity: One AGENTS.md per project, not per branch
  • Typical workflow: Instructions are usually project-level context, not branch-specific
  • Flexibility: Still allows workspace-specific overrides via AGENTS.local.md (gitignored)

Changes

  • buildSystemMessage() now reads AGENTS.md from metadata.projectPath
  • Environment context still uses workspacePath (where code executes)
  • Updated docs/instruction-files.md to reflect project-level instructions
  • Updated all tests to use projectDir instead of workspaceDir
  • Renamed test variables for clarity

Breaking Change

⚠️ Branch-specific AGENTS.md files will no longer be read.

Migration Path

If you were using branch-specific instructions:

  1. Move shared instructions to the project root AGENTS.md
  2. Use AGENTS.local.md (gitignored) for personal/workspace-specific overrides
  3. Consider using mode-specific sections (e.g., ## Mode: Plan) for different contexts

Testing

  • ✅ All existing tests updated and passing
  • ✅ Documentation updated
  • ✅ Works with both LocalRuntime (worktrees) and SSHRuntime (clones)

Generated with cmux

System message incorrectly read AGENTS.md from workspacePath (the worktree
directory) instead of projectPath (the project root). This broke AGENTS.md
forwarding for all workspaces.

Root cause: Recent runtime changes treated workspace and project paths
identically, but instruction files should come from the project root while
the environment context uses the workspace path.

Changes:
- buildSystemMessage() now reads AGENTS.md from metadata.projectPath
- Environment context still uses workspacePath (where code executes)
- Updated all tests to reflect project vs workspace distinction
- Renamed test variables for clarity (workspace -> project)

Fixes instruction file loading for both LocalRuntime (worktrees) and
SSHRuntime (clones).
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Comment on lines 92 to +108
const systemDir = getSystemDirectory();
const workspaceDir = workspacePath;
const projectDir = metadata.projectPath;

// Gather instruction sets from both global and workspace directories
// Global instructions apply first, then workspace-specific ones
const instructionDirectories = [systemDir, workspaceDir];
// Gather instruction sets from both global and project directories
// Global instructions apply first, then project-specific ones
// Note: We read from projectPath (the main repo) not workspacePath (the worktree)
const instructionDirectories = [systemDir, projectDir];
const instructionSegments = await gatherInstructionSets(instructionDirectories);
const customInstructions = instructionSegments.join("\n\n");

// Look for a "Mode: <mode>" section inside instruction sets, preferring workspace over global
// Look for a "Mode: <mode>" section inside instruction sets, preferring project over global
// This behavior is documented in docs/instruction-files.md - keep both in sync when changing.
let modeContent: string | null = null;
if (mode) {
const workspaceInstructions = await readInstructionSet(workspaceDir);
if (workspaceInstructions) {
modeContent = extractModeSection(workspaceInstructions, mode);
const projectInstructions = await readInstructionSet(projectDir);
if (projectInstructions) {
modeContent = extractModeSection(projectInstructions, mode);

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P1 Badge Reading AGENTS from project root drops branch-specific instructions

The new logic loads instructions from metadata.projectPath instead of the workspace directory. For local workspaces we create git worktrees under src/<project>/<branch>, and the branch’s files (including AGENTS.md) live under that worktree path. Using the project root now always reads whatever AGENTS.md is checked out in the main repository, so any instructions modified or added in the current workspace branch are ignored. This also diverges from the documented behavior in docs/instruction-files.md, which layers instructions from <workspace>/AGENTS.md. Please continue reading from the workspace path (or fall back to it) so each workspace can provide its own instructions.

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@ammar-agent
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Closing this PR - Codex correctly identified that this breaks branch-specific instructions.

The original behavior was correct: AGENTS.md should be read from the workspace path (worktree directory), not the project root. This allows different branches to have different instructions.

@ammar Could you clarify what issue you're experiencing with AGENTS.md? The current implementation should be working correctly for local workspaces (worktrees). Are you:

  1. Not seeing AGENTS.md content forwarded at all?
  2. Experiencing this with SSHRuntime specifically?
  3. Seeing something else?

Understanding the actual problem will help me provide the correct fix.

@ammar-agent ammar-agent changed the title 🤖 Fix AGENTS.md forwarding: read from projectPath not workspacePath 🤖 Change AGENTS.md to read from project root, not workspace Oct 26, 2025
@ammar-agent
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This is an intentional design change, not a bug.

We're changing the semantics to read AGENTS.md from the project root instead of individual workspaces. Rationale:

  1. Consistency: All workspaces for a project share the same instructions
  2. Simplicity: One AGENTS.md per project (not per branch)
  3. Typical workflow: Instructions are usually project-level, not branch-specific

Branch-specific customization is still possible via AGENTS.local.md (gitignored), which is the recommended approach for personal/workspace-specific overrides.

The documentation has been updated to reflect this new behavior.

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