Lsp Fix All

Requires the agent-lsp MCP server.

lsp-fix-all

Apply available quick-fix code actions for all current diagnostics in a file, one at a time, re-collecting diagnostics between each fix because line numbers shift after each application.

Important distinction from /lsp-safe-edit: This skill fixes pre-existing diagnostics in a file — errors and warnings that already exist before any edit session begins. /lsp-safe-edit has a code-action step (Step 7) for fixing errors introduced by a specific edit you just made. Use this skill for systematic bulk-fixing of existing issues, independent of any edit session.

When to use / not use

Use this skill when:

• A file has accumulated errors or warnings you want to resolve automatically
• You want to clean up a file before starting new work
• You want to apply all available language-server quick-fixes in bulk

Do NOT use this skill when:

• You just made an edit and want to fix newly introduced errors — use /lsp-safe-edit
• You want to apply structural refactors — this skill applies quick-fixes only (see filtering below)
• The file has zero diagnostics (the skill will report clean and stop)

Input

• file_path: Absolute path to the file to fix.

Workflow

Step 1 — Open and collect initial diagnostics

Call mcp__lsp__open_document with the target file path to ensure it is loaded in the language server. Then call mcp__lsp__get_diagnostics to retrieve all current diagnostics.

If zero diagnostics are returned: report "No diagnostics found — file is clean." and stop. No further steps are needed.

Record the initial count of errors and warnings for the summary output.

Step 2 — Classify and filter code actions

For EACH diagnostic (process one at a time, not in batch):

1. Call mcp__lsp__suggest_fixes at the diagnostic's position/range.
2. Filter the returned actions to quick-fix kind only.
3. Skip any diagnostic for which no applicable quick-fix exists — note it in the summary.

Decision gate — which code actions to apply:

A code action qualifies if: kind == "quickfix", OR kind starts with "quickfix.", OR kind == "source.organizeImports".

Reject actions whose kind is "refactor", starts with "refactor.", or has no kind field at all.

Step 3 — Apply one fix and re-collect (the core loop)

This is the critical correctness constraint: never apply more than one fix per iteration. After each apply_edit call, line numbers in the file shift. Always re-call get_diagnostics before processing the next diagnostic.

Loop:

iteration = 0
max_iterations = 50

while iteration < max_iterations:
    diagnostics = mcp__lsp__get_diagnostics(file_path)
    if diagnostics is empty: break

    for each diagnostic in diagnostics:
        actions = mcp__lsp__suggest_fixes(diagnostic.range)
        applicable = filter to quickfix / source.organizeImports kinds (see Step 2)
        if applicable is not empty:
            apply the first applicable action via mcp__lsp__apply_edit
            record: (line, message, action title) in "Fixed" list
            iteration += 1
            break  # restart the outer loop — line numbers have shifted

    if no diagnostic in this pass had an applicable quick-fix:
        break  # no progress possible — exit loop

Exit the loop when:

• The diagnostics list is empty, OR
• No remaining diagnostic has an applicable quick-fix action, OR
• The iteration counter reaches 50 (safety guard against edge cases where a fix introduces a new fixable diagnostic, preventing infinite loops)

If apply_edit returns an error: stop the loop immediately and report the failure in the summary. Do not attempt further fixes.

Step 4 — Verify and format

After the loop exits:

1. Call mcp__lsp__get_diagnostics one final time to capture the post-fix state.
2. For any remaining diagnostics that had no applicable quick-fix, list them in the "Skipped" section with explanation.
3. Call mcp__lsp__format_document to clean up any indentation drift introduced by the applied edits.

Output format

## lsp-fix-all Summary

File: /path/to/file.go
Initial diagnostics: N errors, M warnings
Fixes applied: K
Remaining (no auto-fix available): J

### Fixed
- line X: <message> → applied: <action title>

### Skipped (no quick-fix available)
- line Y: <message>

If apply_edit failed mid-loop, append:

### Loop stopped
- apply_edit returned error on line Z: <error message>
- Fixes applied before failure: K

Safety rules

• Never apply more than one code action per loop iteration
• Always re-collect diagnostics after each apply_edit before the next fix
• Never apply refactor or structural code actions — quick-fix and source.organizeImports only
• If apply_edit returns an error, stop the loop and report the failure; do not continue
• Maximum iterations: 50 (safety guard against infinite loops in edge cases where a fix introduces a new fixable diagnostic)
• Do not use execute_command — apply_edit is sufficient for all quick-fixes

Prerequisites

LSP must be running for the target workspace. If not yet initialized, call mcp__lsp__start_lsp with the workspace root before proceeding.

Auto-init note: agent-lsp supports workspace auto-inference from file paths. Explicit start_lsp is only needed when switching workspace roots.