GODKILLER MCP is an MCP server that enforces plan-gate-edit-verify-claim phases for Google Antigravity coding agents, blocking premature "done" claims unless disk evidence exists.

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MIT

Last updated

2026-07-31

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FR-AI / ANALYSIS

Why it is worth attention

It tackles AI coding agent unreliability by making phase discipline and on-disk verification mandatory, and it ships an A/B arena protocol plus an engine gauntlet to measure agents with and without the kernel.

Who it is for

  • Developers using Google Antigravity for AI-assisted coding
  • Teams building or adopting MCP-based coding workflows
  • Engineers evaluating AI agent reliability and safety
  • Researchers benchmarking LLM coding agents

Use cases

  • Enforcing plan, edit, verify, and claim_done discipline inside Antigravity
  • Running A/B comparisons of agent behavior with and without GODKILLER MCP
  • Using /ultradeep for controlled one-file, one-phase edits with evidence
  • Hardening agent outputs with verify bundles, fault probes, and council review

Strengths

  • Phase machine, plan lock, and edit-safe checks gate unverified modifications
  • Verify requirements demand disk evidence and use fault_probe to reject weak test suites
  • Includes an 11-dimension A/B benchmark protocol and engine gauntlet with a reported 331-test package suite
  • Security-minded design: secret values are not returned, verify commands use allowlists, and strict mode is available

Considerations

  • The README focuses specifically on Google Antigravity, so broader agent compatibility is not demonstrated
  • The A/B arena requires manual reset and scoring steps rather than a fully automated one-command flow
  • Strict mode, browser, scrape, and OCR features are optional or experimental and need extra setup

README quick start

GODKILLER MCP

Phase kernel for Google Antigravity.
Plan. Gate. Prove on disk. Then claim done — or get blocked.

pip install godkiller-mcp

Contact: Facebook · Instagram @Kayvin.th


Mission

Antigravity skips phases. GODKILLER does not allow that.

Failure modeKernel response
No /planplan / phase gates
Multi-file rush/ultradeep one-file think → plan → edit
Fake “done”verify_bundle + claim_done block (server-authored evidence only)
Session amnesiamarathon + memory graph
Weak reviewLLM council — Coder / Hacker / Optimizer, multi-round debate
goal → mode → evidence/plan → gated edit → disk verify → claim_done

Arena — Antigravity A/B (the real proof)

Pre-solved twins that both pass 516 prove nothing. The honest protocol:

  1. Reset arms to sealed buggy 1_ORIGINAL
  2. You open Antigravity on 3_WITHOUT_MCP with MCP off → agent tries → we score
  3. Reset / open 2_WITH_MCP with MCP on → agent tries → we score
  4. Compare 11 dimensions (fail-closed on missing evidence)
ControlValue
Arena rootGODKILLER_ISOLATED_ARENA / GODKILLER_ARENA_ROOT
Baseline1_ORIGINAL (never edit mid-run)
Bare3_WITHOUT_MCP
GODKILLER2_WITH_MCP
Oraclesealed hidden_oracle/
Protocolbenchmarks/ANTIGRAVITY_AB_PROTOCOL.md

11 dimensions

#Dimension
1Code correctness (oracle pass %)
2Oracle volume (≥516 collected)
3Output integrity (full pytest body)
4Delta from baseline (files actually changed)
5Reconnaissance / exhaustive read artifacts
6Phase discipline (task / plan / marathon)
7Blast radius + edit-safe
8Verify bundle + claim_done
9Council (Coder / Hacker / Optimizer)
10Security hardening signals
11UI visual gate (critic / screenshots)
$env:GODKILLER_ARENA_ROOT="C:\Users\ASUS\Desktop\GODKILLER_ISOLATED_ARENA"
python -m benchmarks.reset_arena
# → open Antigravity bare, then:
python -m benchmarks.score_11 --arm 3_WITHOUT_MCP
# → open Antigravity +

Description

Phase kernel for Google Antigravity — plan, gate, verify on disk, then claim_done.

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