# Troubleshooting

## `/doctor`

The built-in diagnostic tool validates `.sf/` integrity:

```
/doctor
```

It checks:
- File structure and naming conventions
- Roadmap ↔ slice ↔ task referential integrity
- Completion state consistency
- Git worktree health (worktree and branch modes only — skipped in none mode)
- Stale lock files and orphaned runtime records

## Common Issues

### Autonomous mode loops on the same unit

**Symptoms:** The same unit (e.g., `research-slice` or `plan-slice`) dispatches repeatedly until hitting the dispatch limit.

**Causes:**
- Stale cache after a crash — the in-memory file listing doesn't reflect new artifacts
- The LLM didn't produce the expected artifact file

**Fix:** Run `/doctor` to repair state, then resume with `/autonomous`. If the issue persists, check that the expected artifact file exists on disk.

### Autonomous mode stops with "Loop detected"

**Cause:** A unit failed to produce its expected artifact twice in a row.

**Fix:** Check the task plan for clarity. If the plan is ambiguous, refine it manually, then `/autonomous` to resume.

### Wrong files in worktree

**Symptoms:** Planning artifacts or code appear in the wrong directory.

**Cause:** The LLM wrote to the main repo instead of the worktree.

**Fix:** This was fixed in v2.14+. If you're on an older version, update. The dispatch prompt now includes explicit working directory instructions.

### `command not found: sf` after install

**Symptoms:** `npm install -g singularity-forge` succeeds but `sf` isn't found.

**Cause:** npm's global bin directory isn't in your shell's `$PATH`.

**Fix:**

```bash
# Find where npm installed the binary
npm prefix -g

# Add the bin directory to your PATH if missing
echo 'export PATH="$(npm prefix -g)/bin:$PATH"' >> ~/.bashrc
source ~/.bashrc
```

**Workaround:** Run `npx singularity-forge` or `$(npm prefix -g)/bin/next` directly.

**Common causes:**
- **Version manager (nvm, fnm, mise)** — global bin is version-specific; ensure your version manager initializes in your shell config
- **oh-my-zsh** — the `gitfast` plugin aliases `sf` to `git svn dcommit`. Check with `alias sf` and unalias if needed

### `npm install -g singularity-forge` fails

**Common causes:**
- Missing workspace packages — fixed in v2.10.4+
- `postinstall` hangs on Linux (Playwright `--with-deps` triggering sudo) — fixed in v2.3.6+
- Node.js version too old — requires ≥ 24.0.0

### Provider errors during autonomous mode

**Symptoms:** Autonomous mode pauses with a provider error (rate limit, server error, auth failure).

**How SF handles it (v2.26):**

| Error type | Auto-resume? | Delay |
|-----------|-------------|-------|
| Rate limit (429, "too many requests") | ✅ Yes | retry-after header or 60s |
| Server error (500, 502, 503, "overloaded") | ✅ Yes | 30s |
| Auth/billing ("unauthorized", "invalid key") | ❌ No | Manual resume |

For transient errors, SF pauses briefly and resumes automatically. For permanent errors, configure fallback models:

```yaml
models:
  execution:
    model: claude-sonnet-4-6
    fallbacks:
      - openrouter/minimax/minimax-m2.5
```

**Machine surface:** `sf headless autonomous` restarts the process automatically on crash (default 3 attempts with exponential backoff). Combined with provider error recovery, this enables true overnight unattended execution.

For common provider setup issues (role errors, streaming errors, model ID mismatches), see the [Provider Setup Guide — Common Pitfalls](./providers.md#common-pitfalls).

### Budget ceiling reached

**Symptoms:** Autonomous mode pauses with "Budget ceiling reached."

**Fix:** Increase `budget_ceiling` in preferences, or switch to `budget` token profile to reduce per-unit cost, then resume with `/autonomous`.

### Stale lock file

**Symptoms:** Autonomous mode won't start, says another session is running.

**Fix:** SF automatically detects stale locks — if the owning PID is dead, the lock is cleaned up and re-acquired on the next `/autonomous`. This includes stranded `.sf.lock/` directories left by `proper-lockfile` after crashes. If automatic recovery fails, delete `.sf/auto.lock` and the `.sf.lock/` directory manually:

```bash
rm -f .sf/auto.lock
rm -rf "$(dirname .sf)/.sf.lock"
```

### Git merge conflicts

**Symptoms:** Worktree merge fails on `.sf/` files.

**Fix:** SF auto-resolves conflicts on `.sf/` runtime files. For content conflicts in code files, the LLM is given an opportunity to resolve them via a fix-merge session. If that fails, manual resolution is needed.

### Pre-dispatch says the milestone integration branch no longer exists

**Symptoms:** Autonomous mode or `/doctor` reports that a milestone recorded an integration branch that no longer exists in git.

**What it means:** The milestone's `.sf/milestones/<MID>/<MID>-META.json` still points at the branch that was active when the milestone started, but that branch has since been renamed or deleted.

**Current behavior:**
- If SF can deterministically recover to a safe branch, it no longer hard-stops autonomous mode.
- Safe fallbacks are:
  - explicit `git.main_branch` when configured and present
  - the repo's detected default integration branch (for example `main` or `master`)
- In that case `/doctor` reports a warning and `/doctor fix` rewrites the stale metadata to the effective branch.
- SF still blocks when no safe fallback branch can be determined.

**Fix:**
- Run `/doctor fix` to rewrite the stale milestone metadata automatically when the fallback is obvious.
- If SF still blocks, recreate the missing branch or update your git preferences so `git.main_branch` points at a real branch.

### Transient `EBUSY` / `EPERM` / `EACCES` while writing `.sf/` files

**Symptoms:** Autonomous mode or doctor occasionally fails while updating `.sf/` files with errors like `EBUSY`, `EPERM`, or `EACCES`.

**Cause:** Antivirus, indexers, editors, or filesystem watchers can briefly lock the destination or temp file just as SF performs the atomic rename.

**Current behavior:** SF now retries those transient rename failures with a short bounded backoff before surfacing an error. The retry is intentionally limited so genuine filesystem problems still fail loudly instead of hanging forever.

**Fix:**
- Re-run the operation; most transient lock races clear quickly.
- If the error persists, close tools that may be holding the file open and then retry.
- If repeated failures continue, run `/doctor` to confirm the repo state is still healthy and report the exact path + error code.

### Node v26 web boot failure

**Symptoms:** `sf --web` fails with `ERR_UNSUPPORTED_NODE_MODULES_TYPE_STRIPPING` on Node v26.

**Cause:** Node v26 changed type-stripping behavior for `node_modules`, breaking the Next.js web build.

**Fix:** Fixed in v2.42.0+ (#1864). Upgrade to the latest version.

### Orphan web server process

**Symptoms:** `sf --web` fails because port 3000 is already in use, even though no SF session is running.

**Cause:** A previous web server process was not cleaned up on exit.

**Fix:** Fixed in v2.42.0+. SF now cleans up stale web server processes automatically. If you're on an older version, kill the orphan process manually: `lsof -ti:3000 | xargs kill`.

### Non-JS project blocked by worktree health check

**Symptoms:** Worktree health check fails or blocks autonomous mode in projects that don't use Node.js (e.g., Rust, Go, Python).

**Cause:** The worktree health check only recognized JavaScript ecosystems prior to v2.42.0.

**Fix:** Fixed in v2.42.0+ (#1860). The health check now supports 17+ ecosystems. Upgrade to the latest version.

### German/non-English locale git errors

**Symptoms:** Git commands fail or produce unexpected results when the system locale is non-English (e.g., German).

**Cause:** SF parsed git output assuming English locale strings.

**Fix:** Fixed in v2.42.0+. All git commands now force `LC_ALL=C` to ensure consistent English output regardless of system locale.

## MCP Client Issues

### `mcp_servers` shows no configured servers

**Symptoms:** `mcp_servers` reports no servers configured.

**Common causes:**
- No `.mcp.json` or `.sf/mcp.json` file exists in the current project
- The config file is malformed JSON
- The server is configured in a different project directory than the one where you launched SF

**Fix:**
- Add the server to `.mcp.json` or `.sf/mcp.json`
- Verify the file parses as JSON
- Re-run `mcp_servers(refresh=true)`

### `mcp_discover` times out

**Symptoms:** `mcp_discover` fails with a timeout.

**Common causes:**
- The server process starts but never completes the MCP handshake
- The configured command points to a script that hangs on startup
- The server is waiting on an unavailable dependency or backend service

**Fix:**
- Run the configured command directly outside SF and confirm the server actually starts
- Check that any backend URLs or required services are reachable
- For local custom servers, verify the implementation is using an MCP SDK or a correct stdio protocol implementation

### `mcp_discover` reports connection closed

**Symptoms:** `mcp_discover` fails immediately with a connection-closed error.

**Common causes:**
- Wrong executable path
- Wrong script path
- Missing runtime dependency
- The server crashes before responding

**Fix:**
- Verify `command` and `args` paths are correct and absolute
- Run the command manually to catch import/runtime errors
- Check that the configured interpreter or runtime exists on the machine

### `mcp_call` fails because required arguments are missing

**Symptoms:** A discovered MCP tool exists, but calling it fails validation because required fields are missing.

**Common causes:**
- The call shape is wrong
- The target server's tool schema changed
- You're calling a stale server definition or stale branch build

**Fix:**
- Re-run `mcp_discover(server="name")` and confirm the exact required argument names
- Call the tool with `mcp_call(server="name", tool="tool_name", args={...})`
- If you're developing SF itself, rebuild after schema changes with `npm run build`

### Local stdio server works manually but not in SF

**Symptoms:** Running the server command manually seems fine, but SF can't connect.

**Common causes:**
- The server depends on shell state that SF doesn't inherit
- Relative paths only work from a different working directory
- Required environment variables exist in your shell but not in the MCP config

**Fix:**
- Use absolute paths for `command` and script arguments
- Set required environment variables in the MCP config's `env` block
- If needed, set `cwd` explicitly in the server definition

### Session lock stolen by `/next` in another terminal

**Symptoms:** Running `/next` (assisted mode) in a second terminal causes a running autonomous mode session to lose its lock.

**Fix:** Fixed in v2.36.0. Bare `/next` no longer steals the session lock from a running autonomous mode session. Upgrade to the latest version.

### Worktree commits landing on main instead of milestone branch

**Symptoms:** Autonomous mode commits in a worktree end up on `main` instead of the `milestone/<MID>` branch.

**Fix:** Fixed in v2.37.1. CWD is now realigned before dispatch and stale merge state is cleaned on failure. Upgrade to the latest version.

### Extension loader fails with subpath export error

**Symptoms:** Extension fails to load with a `Cannot find module` error referencing npm subpath exports.

**Cause:** Dynamic imports in the extension loader didn't resolve npm subpath exports (e.g., `@pkg/foo/bar`).

**Fix:** Fixed in v2.38+. The extension loader now auto-resolves npm subpath exports and creates a `node_modules` symlink for dynamic import resolution. Upgrade to the latest version.

## Recovery Procedures

### Reset autonomous mode state

```bash
rm .sf/auto.lock
rm .sf/completed-units.json
```

Then `/autonomous` to restart from current disk state.

### Reset routing history

If adaptive model routing is producing bad results, clear the routing history:

```bash
rm .sf/routing-history.json
```

### Full state rebuild

```
/doctor
```

Doctor derives current state from the DB-backed runtime model when available, regenerates projections such as `STATE.md`, and fixes detected inconsistencies. File-based plan and roadmap parsing is only a recovery path for unmigrated or damaged state.

## Getting Help

- **GitHub Issues:** [github.com/singularity-ng/singularity-forge/issues](https://github.com/singularity-ng/singularity-forge/issues)
- **Dashboard:** `Ctrl+Alt+G` or `/status` for real-time diagnostics
- **Forensics:** `/forensics` for structured post-mortem analysis of autonomous mode failures
- **Session logs:** `.sf/activity/` contains JSONL session dumps for crash forensics

## Database Issues

### "SF database is not available"

**Symptoms:** `sf_decision_save`, `sf_requirement_update`, or `sf_summary_save` fail with this error.

**Cause:** The SQLite database wasn't initialized. This happens in manual `/next` sessions (non-autonomous mode) on versions before v2.29.

**Fix:** Updated in v2.29+ to auto-initialize the database on first tool call. Upgrade to the latest version.

## Verification Issues

### Verification gate fails with shell syntax error

**Symptoms:** `stderr: /bin/sh: 1: Syntax error: "(" unexpected` during verification checks.

**Cause:** A description-like string (e.g., `All 10 checks pass (build, lint)`) was treated as a shell command. This can happen when task plans have `verify:` fields with prose instead of actual commands.

**Fix:** Updated in v2.29+ to filter preference commands through `isLikelyCommand()`. Ensure `verification_commands` in preferences contains only valid shell commands, not descriptions.

## LSP (Language Server Protocol)

### "LSP isn't available in this workspace"

SF auto-detects language servers based on project files (e.g. `package.json` → TypeScript, `Cargo.toml` → Rust, `go.mod` → Go). If no servers are detected, the agent skips LSP features.

**Check status:**
```
lsp status
```

This shows which servers are active and, if none are found, diagnoses why — including which project markers were detected but which server commands are missing.

**Common fixes:**

| Project type | Install command |
|-------------|-----------------|
| TypeScript/JavaScript | `npm install -g typescript-language-server typescript` |
| Python | `pip install pyright` or `pip install python-lsp-server` |
| Rust | `rustup component add rust-analyzer` |
| Go | `go install golang.org/x/tools/gopls@latest` |

After installing, run `lsp reload` to restart detection without restarting SF.

**Verify:** After applying either fix, test with:

```bash
terminal-notifier -title "SF" -message "working!" -sound Glass
```