Omnicheck gitlab

OmniCheck

Verify whether requested MR changes have been applied — diff analysis + targeted nudge comments.

Check all discussion threads on a GitLab MR against the current diff. Resolved threads are marked APPLIED. Unresolved threads are analyzed by a subagent to determine if the fix was applied silently or not at all. Unaddressed threads receive nudge replies and a summary comment.

Core principle: Thread status check + diff analysis + user approval gate = accurate, non-spammy follow-up.

Announce at start: "I'm using OmniCheck to verify findings on MR !{id}."

Prerequisites

• glab CLI authenticated (glab auth status to verify)
• Git repository with remote pointing to GitLab
• Current working directory is in the git repo
• MR must have discussion threads

Input Parsing

Accept any of: MR number (136), prefixed (!136), or full GitLab URL. Extract MR ID. If URL provided, extract project path and MR IID.

The Process

Phase 1: GATHER   — fetch all threads + MR diff/data
Phase 2: ANALYZE  — single subagent checks each open thread against the diff
Phase 3: REPORT   — present status table, user approves nudge list
Phase 4: NUDGE    — reply on each NOT_APPLIED thread + post summary MR comment
Phase 5: DONE     — no cleanup needed (no worktrees)

---

Thread Verdicts

Verdict	Meaning	Action
APPLIED	Thread is resolved — trusted as-is	None
SILENTLY_APPLIED	Thread open, but diff shows the concern was addressed	Note in summary only
NOT_APPLIED	Thread open, diff shows no relevant change	Nudge: thread reply + summary row
NEEDS_HUMAN	Ambiguous — cannot determine from diff alone	Flag in report; no automatic nudge

---

Phase 1: Gather

Step 1: Fetch all discussion threads.

mcp__omniforge__fetch_mr_discussions(mr_id="{id}", repo_root="{cwd}")

Returns structured threads with: id, resolvable, resolved, type, file_path, line_number, body, author, replies. The tool already excludes discussions whose notes are all system-generated — every thread returned contains at least one human note.

Note: When building {UNRESOLVED_THREADS_JSON} for the analysis subagent, include each thread's id field as discussion_id so verdicts can be mapped back to GitLab thread IDs for posting replies.

Step 2: Partition threads.

• resolved: true → pre-labeled APPLIED, skip analysis
• resolved: false (any resolvable value) → pass to Phase 2. This includes both resolvable inline threads and general (resolvable: false) human comments — both can receive nudge replies.

Step 3: Fetch MR metadata and diff.

mcp__omniforge__fetch_mr_data(mr_id="{id}", repo_root="{cwd}")

Returns: title, author, source_branch, target_branch, diff, diff_line_count, commits, files_changed.

Step 4: Early exit checks.

• Zero threads returned: "MR !{id} has no discussion threads. Nothing to check." Stop.
• Zero unresolved threads (resolved: false): "All {N} threads are resolved. Nothing to nudge." Stop.

Step 5: Present: "Found {N} total threads ({R} resolved, {U} unresolved). Analyzing {U} unresolved threads."

---

Phase 2: Analyze (Single Subagent)

Goal: For each unresolved thread, determine if the diff addresses its concern.

Template: ./references/analysis-agent-prompt.md

Fill template placeholders:

• {MR_ID} — MR number
• {MR_TITLE} — MR title
• {UNRESOLVED_THREADS_JSON} — JSON array of all unresolved threads
• {GIT_DIFF} — Full diff string from Phase 1

Large MR handling: If unresolved thread count > 15 AND diff_line_count > 5000, group threads by file and dispatch up to 3 subagents. Merge results before Phase 3.

Expected Return

[
  {
    "discussion_id": "abc123",
    "file_path": "src/auth.py",
    "line_number": 47,
    "body_summary": "Missing null check on user input",
    "verdict": "NOT_APPLIED",
    "confidence": 91,
    "reasoning": "The diff shows no changes to src/auth.py around line 47. The null check is still absent."
  },
  {
    "discussion_id": "def456",
    "file_path": ".gitlab-ci.yml",
    "line_number": 1072,
    "body_summary": "Missing placeholder mapping for STRIPE_PRICE_ENTERPRISE",
    "verdict": "SILENTLY_APPLIED",
    "confidence": 87,
    "reasoning": "Line 1072 in .gitlab-ci.yml was changed in the diff to include the placeholder mapping. The thread was not resolved but the concern is addressed."
  }
]

Verdict definitions:

• SILENTLY_APPLIED — thread open but diff shows the concern was addressed
• NOT_APPLIED — thread open and diff shows no relevant change
• NEEDS_HUMAN — diff changes are present but genuinely unclear if they address the concern

---

Phase 3: Report (User Approval Gate)

REQUIRED REFERENCE: ./references/nudge-guide.md — read before presenting results. Contains the exact presentation format and user action matrix. Do NOT present without loading this reference.

Present status combining Phase 1 resolved threads + Phase 2 verdicts:

OmniCheck — MR !{id}: {title}

  ✓ Applied (resolved):     {N} threads
  ✓ Silently Applied:       {N} threads
  ✗ Not Applied:            {N} threads
  ? Needs Human Review:     {N} threads

NOT_APPLIED threads (will receive nudge):
  1. {file}:{line} — {body_summary} [confidence: {score}%]
  2. {file}:{line} — {body_summary} [confidence: {score}%]

NEEDS_HUMAN threads (no automatic nudge):
  3. general — {body_summary}

Post nudge replies on NOT_APPLIED threads? [Y/n]
(Enter numbers to exclude specific threads, e.g. "exclude 2")

CRITICAL: No comments are posted until the user explicitly approves.

---

Phase 4: Nudge

REQUIRED REFERENCE: ./references/nudge-guide.md — contains the exact thread reply template and summary comment template. Do NOT post without loading this reference.

For each approved NOT_APPLIED thread:

Step 1: Post thread reply.

mcp__omniforge__reply_to_discussion(
  mr_id="{id}",
  discussion_id="{discussion_id}",
  body="{nudge_reply_text}",
  repo_root="{cwd}"
)

Step 2: After all thread replies succeed or fail, post one summary comment.

mcp__omniforge__post_review_summary(
  mr_id="{id}",
  summary="{summary_comment_text}",
  repo_root="{cwd}"
)

Ordering guarantee: All thread replies before the summary comment.

On reply failure: Collect the failure, continue with remaining threads, and note the failure in the summary comment.

---

Phase 5: Done

No worktrees → no cleanup needed.

Report:

OmniCheck complete — MR !{id}

  ✓ Nudged: {N} threads
  ✗ Failed to post: {N} threads (list them)

---

Error Handling

Error	Response
glab not authenticated	"Run glab auth login first." Stop.
MR not found	"MR !{id} not found. Verify the number and repository." Stop.
No discussion threads	"MR !{id} has no discussion threads. Nothing to check." Stop.
All threads resolved	"All {N} threads are resolved. Nothing to nudge." Stop.
Analysis agent fails	Present error to user; offer to retry or abort
Thread reply fails	Continue with remaining threads; note failure in summary
Summary comment fails	Report failure; thread replies already posted

---

Integration

MCP Tools:

• mcp__omniforge__fetch_mr_discussions — Fetch all discussion threads
• mcp__omniforge__fetch_mr_data — Fetch MR metadata and diff
• mcp__omniforge__reply_to_discussion — Post nudge reply on a thread
• mcp__omniforge__post_review_summary — Post summary comment on MR

Subagent Template:

• ./references/analysis-agent-prompt.md — Analysis Agent (single, diff-only check)

---

Never

• Post comments without explicit user approval (Phase 3 gate)
• Add AI attribution to any posted comment
• Use gh (GitLab — use glab exclusively)
• Auto-resolve any threads (OmniCheck only nudges, never resolves)
• Create worktrees (diff-only analysis)
• Skip any of the 5 phases

Always

• Fetch threads and diff in Phase 1 before dispatching analysis
• Present status table and wait for user approval before posting
• Post thread replies before the summary comment
• Report final outcome including any failed posts
• Use glab for all GitLab operations