veto

92 agentic tools. 49 specialists. Every major AI CLI. Self-learning. Zero extra cost on subscriptions.

An MCP server that runs locally on your machine, plugs into Claude Code, Codex CLI, Gemini CLI, Antigravity CLI, Cursor, Windsurf, Zed, and JetBrains using your existing subscriptions — giving every AI a council of specialist agents, local LLM support, SDD agents, playwright automation, persistent cross-platform memory, a self-learning router that re-tunes its tier thresholds automatically every 20 recorded task outcomes (reviews record outcomes for you; configurable via auto_apply_learning), CI/CD gates, workspace discovery, and bidirectional IDE communication.

Billing note: "Zero cost" applies to subscription plans (Claude Max, Gemini Advanced, etc.). If you are on API/pay-per-token billing, LLM reasoning done for Veto agents (via the agentic loop or MCP Sampling) counts toward your token usage like any other turn. veto init detects API key environment variables and warns you automatically.

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How the Agents Work

No API keys, zero extra cost. Every worker agent is a deterministic expert module at its core, with two optional layers of LLM reasoning on top — all of it delegated to the AI you're already paying for.

Default — Deterministic expert modules

Out of the box, each of the 42 worker agents runs as a hand-written expert module (plan() / analyze() in src/agents/) — not an LLM. They always run, work offline, and cost zero tokens. Their depth varies by design: analysis agents (security scanner, secrets, dependency audit, clone detector) apply real algorithms — regex/AST detection, OWASP/CWE rules, hash-based clone matching — while planning agents (coder, debugger, tester, …) are structured expert playbooks: curated steps, checklists, and pitfalls for the task category, built to be reasoned over by the AI you already pay for rather than to reason themselves.

Path A — Agentic loop (most clients: Claude Code, Cursor, Windsurf)

Veto returns the specialist's role, rubric, and an output contract as an llm_upgrade prompt. The host AI reasons as the specialist and passes structured JSON back to complete the operation. This is the primary path — it costs nothing beyond your existing subscription and works on every client.

Path B — MCP Sampling (clients that support server.createMessage)

Where Sampling is available, the same upgrade happens server-side without the extra round-trip. Note: the July 2026 MCP spec revision deprecates Sampling protocol-wide (12-month sunset), so the agentic loop (Path A) is Veto's long-term default; Sampling remains a transparent optimization where it exists.

The 7-agent Council is LLM-first — its value is the multi-agent debate — but it too falls back to a deterministic verdict when no LLM path is available. When multiple agents run, they execute in parallel.

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Specialist Roles

49 specialists: 42 deterministic worker agents across 6 domains + a 7-agent Council. The Council debates trade-offs before you build; the worker agents do the hands-on analysis and planning. Each is a deterministic expert module that can upgrade to LLM reasoning — see How the Agents Work. List them anytime with veto agents.

Council (7) Lead Dev · PM · Architect · UX · Devil's Advocate · Legal · Security

Development (12) Coder · Code Reviewer · Tester · Debugger · Refactor · Database · API · Frontend · Backend · DevOps · Performance · Migration

Security (6) Security Scanner · Auth Agent · Data Privacy · Secrets Agent · Dependency Audit · Penetration Tester

Memory (5) Context Manager · Decision Logger · Project Mapper · Pattern Learner · Knowledge Base

Research (7) Researcher · Tech Advisor · Cost Analyzer · Competitor Analyzer · Risk Assessor · Estimator · Ethics & Bias

Quality (5) Code Quality · Documentation · Accessibility · Compatibility · Error Handling

Workflow (7) Task Planner · Task Coordinator · File Manager · Git Agent · Search Agent · Reporter · Automation

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MCP Tools (92)

Category	Tools
Session	veto_status · veto_session_save · veto_session_restore · veto_sessions_list · veto_autosave_status · veto_session_replay
Router	veto_route_task · veto_rate_status
Council	veto_council_debate · veto_benchmark · veto_adr
Agents	veto_agent_plan · veto_execute_parallel · veto_explain · veto_compose_agents · veto_delegate
Review	veto_code_review · veto_security_scan · veto_secrets_scan · veto_diff_review · veto_full_review · veto_pr_review
Pipelines	veto_ci_gate · veto_pre_commit · veto_new_feature · veto_workflow · veto_task_parse
Advanced	veto_local_llm · veto_semantic_search · veto_sdd_agent · veto_playwright · veto_notify_ide
Quality	veto_clone_detector · veto_lint_rules · veto_api_contract · veto_a11y_advisor · veto_type_coverage · veto_test_gaps
Advisors	veto_dep_advisor · veto_dep_verify · veto_query_advisor · veto_bundle_advisor · veto_dead_code · veto_hitl_checkpoint · veto_drift_check
Watching	veto_watch · veto_watch_poll · veto_watch_stop
Memory	veto_memory_store · veto_memory_search · veto_memory_delete · veto_project_map_update · veto_project_map_get · veto_pattern_store · veto_patterns_list · veto_memory_export · veto_memory_import
Learning	veto_record_outcome · veto_learning_stats · veto_learning_apply
Handoff	veto_handoff · veto_continue · veto_platform_setup
Observability	veto_usage_status · veto_audit_log · veto_health · veto_metrics
Discover	veto_discover · veto_summarize · veto_git_blame · veto_changelog · veto_onboard · veto_debt_register
DevTools	veto_docs_fetch · veto_context_status · veto_openapi_gen · veto_flag_auditor · veto_env_setup · veto_commit_message · veto_pr_description · veto_pr_post · veto_prompt_optimizer · veto_sre_advisor · veto_diagram · veto_rca · veto_doc_gen · veto_postmortem · veto_release_notes · veto_translate · veto_merge_conflict
Plugins	veto_plugins

Compact Mode — 92 tools without the context tax

92 tool schemas cost a client ~16K context tokens before the user types a word. Compact mode advertises a surface that is 5–6× smaller: seven core tools (veto_status, veto_session_save, veto_session_restore, veto_route_task, veto_council_debate, veto_memory_search, veto_record_outcome) plus two meta-tools — veto_find_tools searches the full catalog by keyword and returns matching schemas on demand; veto_call invokes any catalog tool by name. Every tool remains directly callable in both modes; compact only changes what is advertised up front.

Enable it with VETO_COMPACT=1 in your MCP server config env, or "compact_tools": true in ~/.veto/config.json:

{
  "mcpServers": {
    "veto": {
      "command": "npx",
      "args": ["-y", "--package", "@jigyasudham/veto", "veto-server"],
      "env": { "VETO_COMPACT": "1" }
    }
  }
}

Dependency-Hallucination Guard

LLMs propose plausible-but-nonexistent package names, and adversaries register those names on public registries (slopsquatting) — a supply-chain attack class with no pre-install check in most AI workflows. veto_dep_verify checks every proposed package against the live registry before you install:

veto_dep_verify { packages: ["axios", "axois", "left-padd"], ecosystem: "npm" }
→ axios      verified    (14 years old, 40M downloads/month)
→ axois      HIGH_RISK   (1 edit from "axios" — possible typosquat)
→ left-padd  NOT_FOUND   (likely hallucinated — do NOT retry the install later:
                          nonexistent AI-suggested names are prime slopsquat targets)

Signals per package: registry existence, age, monthly downloads, version history, deprecation, and typo-distance from popular packages. Supports npm, PyPI, and crates.io. Network failures return unverifiable — never silently safe.

Decision-Drift Enforcement

AI assistants forget architectural decisions and re-litigate them sessions later — the most common complaint about long-running AI projects. Veto's memory doesn't just store decisions; it enforces them. Record a decision once as a machine-checkable constraint:

veto_decisions {
  action: "add",
  rule: "We use Postgres — no Mongo",
  why: "Decided 2026-05: relational data, team expertise",
  forbidden_patterns: ["mongoose", "mongodb"],
  severity: "block"
}

From then on, veto_diff_review and veto_ci_gate automatically fail any diff whose added lines match a forbidden pattern — when an AI quietly adds mongoose to the imports three sessions later, the review fails with the rule and the rationale attached. Patterns are case-insensitive regexes (with substring fallback), optionally scoped to a file glob (src/**/*.ts), per-project or global, severity block or warn. Manage with action: list / check / disable / enable.

Compounding-Error Circuit Breaker

Agents fail silently in loops — retrying the same broken call, re-hitting the same error, thrashing between two tools — and burn a whole session before anyone notices. veto_drift_check scans the recent tool-call trace for that pattern mid-flight and trips a breaker before the spiral compounds:

veto_drift_check
→ DRIFT DETECTED
  • 4 consecutive failed calls (veto_diff_review)
  • same error repeated 3× ("no diff provided")
  • tool veto_route_task called 6× in a row
→ remediation (debugger agent): stop retrying; the diff is empty —
  point at a project_dir with uncommitted changes or pass `diff` explicitly.

It looks for three drift signals — consecutive failures, duplicate error messages, and single-tool repetition — and when any trips, it runs the debugger agent over the trace for a concrete recovery step instead of letting the loop continue. Call it as a periodic checkpoint in long agentic runs.

Which tool do I use?

Several tools overlap by design (different granularity or entry point). Quick guide:

Reviewing code

You have…	Use	Note
A snippet or single file in hand	veto_code_review	not veto_diff_review, which reads a git diff
Uncommitted/changed files (git diff)	veto_diff_review	code + security + secrets scans in parallel
To gate a commit (hard-block on secrets)	veto_pre_commit	tuned for commit-time
To gate CI (exit code + pass/warn/fail)	veto_ci_gate	for GitHub Actions / GitLab CI
A deeper pre-merge/pre-ship pass (+ quality)	veto_full_review	richer than veto_diff_review
A GitHub PR by number/URL	veto_pr_review	fetches the diff, returns postable comments

Remembering things

Want to…	Use
Save/recall a solution, decision, or reference	veto_memory_store / veto_memory_search
Track a recurring code convention	veto_pattern_store / veto_patterns_list
Navigate the codebase without scanning the filesystem	veto_project_map_get (refresh via veto_project_map_update)

Running multi-step work

Want to…	Use
Run several agents at once on one task	veto_execute_parallel
Run a sequential pipeline with pass/fail gates	veto_workflow
Turn a PRD / plain English into a task DAG	veto_task_parse (feeds veto_workflow)
Plan a new feature end-to-end (council → plan → tasks)	veto_new_feature

Sessions

Want to…	Use
Resume work with full saved context	veto_session_restore (or veto_continue for the latest)
See the event / tool-call timeline of a session	veto_session_replay
Move work to another AI tool	veto_handoff → veto_continue

MCP Resources

URI	What it returns
veto://sessions	All saved sessions across platforms
veto://project-map?dir=<path>	Stored project structure map
veto://memory?q=<query>	Knowledge base search results
veto://patterns	Learned coding patterns

MCP Prompts

Prompt	What it does
code-review	Full code review — paste code, get scored findings
security-audit	OWASP Top 10 scan with CWE references
deploy-checklist	Council reviews your deployment plan before you ship
explain-file	Expert explanation of any file, auto-routed by type

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CLI Commands

veto init                        # Configure all AI tools + scan project
veto doctor                      # Check MCP registrations + system health
veto status                      # Version, DB path, session/memory/outcome counts
veto version                     # Alias for veto status
veto sessions                    # List last 20 saved sessions ([auto] badge on auto-saves)
veto sessions --clean            # Remove auto-saves older than 7 days
veto memory [query]              # Search knowledge base (blank = all entries)
veto patterns [prefix]           # List learned agent/routing patterns
veto tools [filter]              # List all 92 MCP tools (--json for machine output)
veto agents [filter]             # List all 49 specialists — workers + council (--json)
veto routing [status|log|reset]  # Inspect the opt-in routing feedback loop
veto hook install                # Install pre-commit secrets scan hook
veto hook remove                 # Remove the veto pre-commit hook
veto check                       # Scan staged changes for secrets (used by hook)
veto help                        # Commands + MCP tools reference
veto help --troubleshoot         # Full troubleshooting guide

veto doctor

veto doctor

  Veto Doctor — system health check
  ─────────────────────────────────────────────────────
  ✓ Node.js v22.5.0
  ✓ ~/.veto exists
  ✓ Database ~/.veto/veto.db
    17 sessions · 12 memories · 3 patterns

  MCP Registrations
  ─────────────────────────────────────────────────────
  ✓ Claude Code — registered
  ✓ Gemini CLI — registered
  ✓ Antigravity CLI — registered
  · Codex CLI — not installed
  · Zed — not installed

  ✓ All checks passed — Veto is healthy!

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Council Debate

Two-phase flow — works on Claude Code, Gemini CLI, Antigravity CLI, and Codex CLI with no API keys:

# Phase 1 — call with task, get instant deterministic result + LLM upgrade prompt
veto_council_debate {
  task: "migrate auth from sessions to JWTs",
  project_dir: "/your/project",
  strictness: "standard"
}
→ {
    llm_backed: false,
    final_verdict: "YELLOW",
    votes: { lead_dev: {...}, architect: {...}, security: {...}, ... },
    llm_upgrade: {
      available: true,
      instruction: "Read debate_prompt, reason as all 7 agents, call again with agent_responses",
      debate_prompt: "You are running a Veto Council debate. Analyze the task as each specialist..."
    }
  }

# Phase 2 — reason as all 7 agents, pass responses back → get LLM-backed verdict
veto_council_debate {
  task: "migrate auth from sessions to JWTs",
  agent_responses: {
    lead_dev:  { verdict: "warn",    reason: "Stateless JWTs complicate logout — need blocklist", concerns: ["Refresh token rotation must be atomic"], recommendation: "Use short-lived access tokens (15m) + httpOnly refresh tokens" },
    pm:        { verdict: "approve", reason: "JWT migration unblocks mobile clients", concerns: [], recommendation: "Ship behind a feature flag, roll back if logout issues" },
    architect: { verdict: "approve", reason: "Good fit for stateless microservice boundary", concerns: ["Clock skew can break expiry across services"], recommendation: "Add NTP sync check; use relative expiry not absolute timestamps" },
    ux:        { verdict: "approve", reason: "No user-visible change if migration is seamless", concerns: [], recommendation: "Silent migration — no logout required for existing sessions" },
    devil:     { verdict: "warn",    reason: "What if the refresh token store goes down at 2AM?", concerns: ["Redis outage = all users logged out"], recommendation: "Fallback to session auth if Redis is down; use short rotation window" },
    legal:     { verdict: "approve", reason: "JWTs are industry standard, no new compliance risk", concerns: [], recommendation: "Document token storage in privacy policy" },
    security:  { verdict: "warn",    reason: "Refresh token rotation must be atomic — TOCTOU risk", concerns: ["localStorage storage of access token is XSS-vulnerable"], recommendation: "Store access token in memory only; refresh token in httpOnly Secure SameSite=Strict cookie" }
  }
}
→ {
    llm_backed: true,
    final_verdict: "YELLOW",
    warnings: ["Refresh token rotation must be atomic...", "What if the refresh token store goes down..."],
    recommended: "Proceed with JWT. Use httpOnly cookies for refresh tokens, memory-only for access tokens..."
  }

Council strictness

veto_council_debate { task: "...", strictness: "fast" }     # 3 agents, instant
veto_council_debate { task: "...", strictness: "standard" } # 7 agents, default
veto_council_debate { task: "...", strictness: "strict" }   # 7 + devil rebuttal

---

Session Tagging + Search

veto_session_save {
  auto_summarize: true,
  tags: ["auth", "jwt", "middleware"]
}

veto_sessions_list { query: "auth" }
→ sessions matching "auth" in summary, context, tags, or project_dir

Token usage is manually reported — pass token_count to veto_status or veto_session_save and Veto stores it per platform per day. veto_rate_status shows what you've reported; nothing is counted automatically.

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Workspace Discovery

veto_discover { "project_dir": "/your/project" }
→ {
    git:        { branch: "main", commit: "a3f2b1", dirty_files: [], recent_commits: [...] },
    ecosystems: { node: "my-app v2.1.0" },
    tech_stack: ["TypeScript", "React", "Prisma"],
    key_files:  ["tsconfig.json", "prisma/schema.prisma", ".env.example"],
    total_files: 142
  }

---

Diff Review

veto_diff_review { project_dir: "/your/project" }
→ {
    verdict: "warn",
    files_changed: 4,
    code_review: { score: 78, critical: 0, high: 2, findings: [...] },
    security:    { score: 91, critical: 0, high: 0, findings: [...] },
    secrets:     { findings: [] },
    summary: "⚠️  WARN — 4 file(s) changed..."
  }

---

Sequential Pipelines

veto_workflow {
  steps: [
    { id: "code",     agent: "coder",           task: "implement auth middleware", gate: 70 },
    { id: "review",   agent: "reviewer",         task: "review the implementation", gate: 75 },
    { id: "security", agent: "security-scanner", task: "scan for vulnerabilities",  gate: 80 },
    { id: "test",     agent: "tester",           task: "write test cases" }
  ],
  project_dir: "/your/project"
}
→ { verdict: "passed", steps_passed: 4, steps_failed: 0, results: [...] }

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Self-Learning Router

Every agent tool auto-records a quality signal when it completes. After any working session, veto_learning_stats shows live data and veto_learning_apply adjusts tier thresholds automatically after ~20 calls.

The loop also feeds itself implicitly: veto_learning_stats mines the tool-call trace for signals nobody recorded manually — an agent-backed tool that returned an error, or the same analysis tool re-run within minutes in one session (which usually means the first answer didn't satisfy) — and records them as low-quality outcomes automatically.

veto_route_task { task: "debug auth issue", file_ext: ".ts" }
→ { ..., recommended_agent: "debugger" }   # ← predicted from history

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Plugin System

// ~/.veto/agents/my-agent.js
export function plan(task, context) {
  return {
    agent: 'my-agent', task, tier: 2,
    approach: 'Your custom approach...',
    steps: ['Step 1', 'Step 2'],
    checklist: ['[ ] Check 1'],
    pitfalls: ['Pitfall 1'],
    patterns: ['Pattern 1'],
    duration_estimate: '1-2 hours',
  };
}

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Cross-Platform Handoff

Claude at 90%  →  veto_handoff { summary, context }
Open Gemini    →  veto_continue { resuming_as: "gemini" }
Full context restored. Continue exactly where you stopped.

Platform switching is manual — Veto surfaces which platform has budget remaining via veto_rate_status, you decide when to switch.

Platform	Support
Claude Code	✅ Native MCP
Gemini CLI	✅ MCP support
Antigravity CLI	✅ MCP support
Codex CLI	✅ MCP support
Cursor	✅ MCP support
Windsurf	✅ MCP support
Zed	✅ MCP support (context_servers)

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Release Notes

2.5.0

• veto_drift_check — compounding-error circuit breaker. Scans the recent tool-call trace for consecutive failures, repeated error messages, and single-tool thrashing, then runs the debugger agent for a concrete recovery step. See Compounding-Error Circuit Breaker.
• Council calibration fixes. Tightened the deterministic council's pattern triggers so they no longer false-fire on generic words (e.g. "server", "transport") or semver strings like v2.5.0, and removed stale hardcoded tool counts from agent reasoning.

2.4.0

• veto_decisions — decision-drift enforcement. Record an architectural decision once as a machine-checkable constraint; veto_diff_review and veto_ci_gate then auto-fail any diff whose added lines reintroduce a forbidden pattern. See Decision-Drift Enforcement.

2.3.0

• veto_dep_verify — dependency-hallucination guard. Verifies every proposed package against the live npm/PyPI/crates.io registry before install, flagging hallucinated names and typosquats (slopsquatting defense). See Dependency-Hallucination Guard.

2.2.0

• Compact mode (VETO_COMPACT=1) — advertises 9 tools incl. veto_find_tools / veto_call meta-tools, ~5–6× schema reduction. See Compact Mode.
• Implicit outcome mining — veto_learning_stats now mines outcomes automatically from the tool-call trace (errored calls, rapid re-runs), no manual veto_record_outcome needed.
• Experimental streamable HTTP transport (veto-server --http). See HTTP Transport.

HTTP Transport (experimental)

veto-server --http [port] serves MCP over streamable HTTP at http://127.0.0.1:<port>/mcp (default port 3939) instead of stdio — for gateways, remote clients, or anything that can't spawn a subprocess. It runs stateless (no session IDs — the direction of the July 2026 MCP spec) and binds loopback only; set VETO_HTTP_HOST to expose it deliberately.

Project Structure

Veto is a single MCP server (src/server.ts) that registers 92 tools, MCP Resources, and Prompts, then dispatches every tool call through a per-domain handler registry — there is no monolithic switch. Each domain owns a HandlerMap module under src/server/handlers/:

Module	Tools	Domain
workers.ts	15	single-agent worker delegations (code_review, security_scan, explain, …)
generators.ts	11	single-agent artifact generators (adr, diagram, rca, doc_gen, onboard, …)
memory.ts	9	knowledge base, patterns, project map
observability.ts	7	health, metrics, usage, audit, context/rate status
advisors.ts	8	project scanners (dep, query, bundle, dead-code, flag, openapi, HITL, drift-check)
session.ts	6	save · restore · list · handoff · continue · replay
review.ts	5	diff · ci · pr · full review + pre-commit pipelines
git.ts	5	blame · changelog · commit message · PR description/post
core.ts	5	status · routing · platform setup · docs fetch · discover
agents.ts	5	agent_plan · execute_parallel · delegate · workflow · task_parse
devtools.ts	5	plugins · local LLM · clone detector · compose · notify IDE
council.ts	3	council_debate · benchmark · new_feature
learning.ts	3	record_outcome · learning_stats · learning_apply
watch.ts	3	watch · poll · stop

Shared, independently testable internals live in src/server/:

• registry.ts — the ToolContext ({ request, args, server }) and HandlerMap types
• runtime.ts — shared mutable state (active project dir, auto-save, server health, VERSION)
• scan-core.ts — git-diff reader, triple-scan, and the agentic worker loop (unit-tested)

Every handler module is importable in isolation, so behaviour is covered by tests/server/dispatch.test.ts (the callTool behavioral net) and tests/tools/definitions.test.ts (the 89-tool registry-coverage check).

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Tech Stack

• Language: TypeScript (strict mode)
• Runtime: Node.js 22.5+ (built-in node:sqlite — no native compilation)
• Dependencies: @modelcontextprotocol/sdk only — one package, zero native addons
• Memory: Local SQLite — zero config, works offline, portable via JSON export
• Platforms: Claude Code · Gemini CLI · Antigravity CLI · Codex CLI · Cursor · Windsurf · Zed

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License

MIT © 2026 Jigyasu Dham