mantis-meta-agent

A supervisor for a long-running automated security review campaign. It coordinates repeated review stages and monitors whether they continue running.

In plain words
What is it for?
Use it to manage continuous review passes, optional source synchronization, code snapshots, and the progress of the security pipeline.
Why use it?
It keeps a multi-stage security process organized and resilient instead of requiring someone to start and watch every stage manually.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/google/mantis/mantis-meta-agent
Any agent
npx skills add google/mantis --skill mantis-meta-agent
Clone the repo
git clone --depth 1 https://github.com/google/mantis

Made for: Claude Code, Codex.

Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 9,399 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00044 $0.09399
Opus 5 $0.00022 $0.04699
Sonnet 5 $0.00009 $0.01880
Haiku 4.5 $0.00004 $0.00940

Measured 2d ago against content hash 7b6c7d740259, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

mantis-meta-agent scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Recursive force deletemediumDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

older via the matching teardown (rm -rf for copies; git worktree

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

mantis-meta-agent/SKILL.md · 612 lines

How it starts

The opening of the file, as written. The whole thing — 612 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Meta-Agent Orchestrator (/mantis-meta-agent)

System Goal

Autonomous Campaign Manager. Supervises the continuous review loop, ensures resilience, and monitors long-running security pipelines.

Command Definition

  • Command: /mantis-meta-agent
  • Description: Acts as the persistent supervisor, launching and monitoring the automated review campaign.
  • Parameters:
    • --sync: OPT-IN boundary sync + snapshot pinning. When present (or when the user explicitly instructs a sync for this pass), synchronize the target with its upstream at the START of the pass (Block C) and pin an immutable per-pass snapshot (Block D). When ABSENT (the default), do NOT sync and do NOT pin: leave active_snapshot/snapshot_history unwritten, leave snapshot_pinned unset, and run the pass against the live tree exactly as today (single static snapshot; --target_root semantics unchanged).
    • --snapshot_keep=<N>: retention for pinned snapshots under <state_root>/.mantis_snapshots/ (Block D step 6 GC). DEFAULT 2 (this pass + previous), safe because correctness never re-reads an older snapshot; raise it for patch/PoC rebasing against a finding's discovery snapshot.
    • --state_root=<absolute path>: directory that contains workspace/ and .mantis_snapshots/. DEFAULT: the absolute path of the current working directory at meta-agent launch (i.e., the parent of workspace/). If state_root resolves inside CODE_ROOT (the colocated case — the default when launching from inside the target repo), Step 3 (PIN) MUST (a) HALT and yield to the user with a message to pass --state_root outside CODE_ROOT — this is the DEFAULT and the only safe behavior without explicit opt-in. Auto-relocate (option b) is opt-in ONLY via an explicit --auto_relocate_state flag (or an equivalent user instruction to auto-relocate for this pass); without it, never move user state. When the user has explicitly opted in, auto-relocate by moving workspace/ and .mantis_snapshots/ to a sibling directory outside CODE_ROOT and updating state_root for the remainder of the pass. This is the "colocated state" transition that mantis-pipeline-adapter Scenario 1 requires. The relocation is a MOVE (not copy-then-delete) and is skipped if workspace/.workspace_edit.lock is held (INV-5: no user data loss). The MOVE MUST be atomic on the same filesystem: move into a fresh temp dir under the sibling's parent, then rename(2) to the final sibling path; refuse and HALT if the sibling already exists or the temp dir cannot be created (never clobber an existing directory). If rename(2) fails, leave the source untouched and HALT — do NOT fall back to copy-then-delete.
    • --auto_relocate_state: OPT-IN flag. When state_root resolves inside CODE_ROOT (colocated state — the default when launching from inside the target repo), the default behavior is to HALT and yield to the user. Passing this flag (or giving an equivalent user instruction) authorizes the atomic-MOVE auto-relocate path described under --state_root above. Without it, never move user state.

Read the full file on GitHub · 612 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 612 lines · 44 tokens per session scan B 7b6c7d740259

Subscribe to this mod's changes

mantis-meta-agent is a skill published in the GitHub repository google/mantis (853 stars, last pushed 5d ago), licensed Apache-2.0. It adds 44 tokens to every session and 9,399 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.