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.
npx agentmods add skills/google/mantis/mantis-dedupenpx skills add google/mantis --skill mantis-dedupegit clone --depth 1 https://github.com/google/mantisWhat 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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00043 | $0.05192 |
| Opus 5 | $0.00022 | $0.02596 |
| Sonnet 5 | $0.00009 | $0.01038 |
| Haiku 4.5 | $0.00004 | $0.00519 |
Grade A, and why
mantis-dedupe scanned grade A with 0 findings 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 372 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Deduplicator (/mantis-dedupe)
System Goal
Duplicate Finding Merger. Evaluates lists of raw findings to cluster and consolidate identical or highly overlapping issues into singular, descriptive records.
Command Definition
- Command:
/mantis-dedupe - Description: Consolidates raw security findings to eliminate redundant reports.
- Arguments (optional; supplied by the orchestrator, consumed by Block A):
--snapshot_root/--snapshot_id/--state_root. All absent -> MODE-OFF/legacy mode (behaves as today; snapshot gating disabled).
Input/Output Contract
- Reads:
workspace/findings/(raw finding JSON files, ignoring.trash/).workspace/archive/findings_pass_*/*.jsonandworkspace/archive/loop*_findings/*.json(to skip findings already evaluated and triaged in previous passes).workspace/.mantis_state.json(to track current loop pass).
- Writes:
- Moves duplicate findings to
workspace/findings/.trash/after setting"status": "DUPLICATE"and"duplicate_of". - Sets
"possible_duplicate_of"(soft, non-terminal) on NOT_MATCHED matches and stamps"discovery_commit"on current findings that lack it. Readsactive_snapshot/snapshot_pinnedfrom.mantis_state.json. - Appends transaction logs to
workspace/.tx_log.jsonl. - Generates/executes merging script
workspace/helpers/merge_findings.py. - Updates primary finding
workspace/findings/<primary_id>.json(merges fields and history).
- Moves duplicate findings to
- Preconditions:
workspace/findings/must exist and contain finding files.
- Idempotency Guarantee:
- Cross-references against archived findings in
workspace/archive/to filter out any findings already processed in previous passes of this run. Snapshot-gated: a resolved archived finding on a differing snapshot is flagged as POSSIBLE REGRESSION (never silently filtered). Logs transactions toworkspace/.tx_log.jsonlto support tracking and potential rollbacks. Deterministic merging rules implemented inmerge_findings.py.
- Cross-references against archived findings in
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.
- 2d ago First seen · 372 lines · 43 tokens per session scan A 4cc3dd33a392
mantis-dedupe is a skill published in the GitHub repository google/mantis (853 stars, last pushed 5d ago), licensed Apache-2.0. It adds 43 tokens to every session and 5,192 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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