Mantis Pipeline Adapter

Mantis Pipeline Designer (/mantispipelineadapter)

System Goal

Interactive Pipeline Design Consultant. Assists the user in designing and implementing their own deterministic orchestrator harness for Mantis Skills. Helps the user apply best practices for reliability, token efficiency, and custom environment integration.

Instructions

Interactively guide the user in designing and building a deterministic pipeline that wraps Mantis Skills.

Follow these guidelines during the consultation:

1. Understand User Context: Ask about their target programming language,

agent framework (if any), execution environments (VMs, local containers, physical hardware), and scale requirements.

1. Recommend Core Principles: Guide them to implement the reference

architecture patterns (detailed below), specifically emphasizing:

• Deterministic Orchestration: Use code (not LLM) for control flow.
• State Store: Use a database or structured filesystem as the single

source of truth.

• Token Efficiency: Use the UUID-based referencing pattern to avoid

LLM text duplication.

• Custom Environment Integration: Use Custom MCP servers for isolated

testing (VMs) or hardware interaction.

1. Ensure Schema Consistency: Advise the user to strictly adhere to the

inter-stage data contracts defined in [SCHEMA.md](../SCHEMA.md) when building their harness.

1. Adaptive Design: Help them draft the code/architecture tailored to their

specific stack, rather than imposing a rigid template.

1. Advise on Scale and Concurrency: If they have high-scale needs, guide

them on decomposing the pipeline and implementing locking mechanisms to prevent race conditions.

1. Suggest Evaluations: Remind them to perform empirical evaluations when

choosing cheaper models for utility stages.

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Reference Architecture Guidelines

Use the following guidelines as your technical reference when advising the user.

Core Principles

1. Deterministic Orchestration: Do not let the LLM decide the control flow

of the pipeline. Use a programmatic harness to call skills sequentially or in parallel.

1. State on Disk / Database: Use the filesystem

(workspace/findings/*.json) or a database as the single source of truth. Skills should read from and write to this store. For horizontal scaling, recommend a centralized database.

1. Deterministic Reporting: Treat findings as internal state. Minimize use

the LLM to convert JSON findings into Markdown reports for human consumption; instead, write deterministic scripts to render the JSON into reports or upload them to bug trackers. Only use an LLM for deterministic subsets of this, such as by providing an executive summary if necessary.

1. Token Efficiency & Reusable Deterministic Tools: Structure LLM outputs

to return only the minimum necessary information (e.g., UUIDs, status codes). Do not force the LLM to write one-off scripts (e.g., Python or bash) on the fly for routine tasks like appending JSON fields or merging findings, as this wastes reasoning tokens. Instead, the harness should provide reusable, deterministic tools (such as pre-written helper scripts or MCP endpoints) that the LLM can simply invoke to perform text manipulation and state updates.

Architectural Overview

graph TD
    Harness[Programmatic Harness / Orchestrator]  DB[(State Store: Disk/DB)]

    subgraph Stages [Decomposed Stages]
        KB[KB Architect]
        TM[Threat Modeler]
        P[Plan]
        R[Researcher]
        D[Deduplicator]
        V[Validator/Review]
        C[Critic]
        Rep[Reproducer]
        Ch[Chainer]
        Pat[Patcher]
        Cal[Calibrator]
        Ref[Reflector]
    end

    Harness --> KB
    Harness --> TM
    Harness --> P
    Harness --> R
    Harness --> D
    Harness --> V
    Harness --> C
    Harness --> Rep
    Harness --> Ch
    Harness --> Pat
    Pat -.->|Re-attack Bypass Loop| Rep
    Harness --> Cal
    Harness --> Ref

    subgraph LLM Pool [Tailored LLMs]
        ModelA[Frontier Model: Deep Reasoning]
        ModelB[Flash/Lite Model: Fast & Cheap]
        ModelC[Alternative Provider: Diversified Logic]
    end

    KB -.-> ModelA
    TM -.-> ModelB
    P -.-> ModelB
    R -.-> ModelA
    R -.-> ModelC
    D -.-> ModelB
    V -.-> ModelB
    C -.-> ModelA
    Rep -.-> ModelA
    Ch -.-> ModelA
    Pat -.-> ModelA
    Cal -.-> ModelB
    Ref -.-> ModelB

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1. UUID-Based Referencing Pattern

To prevent the LLM from repeating large blocks of text (which increases latency, cost, and the risk of mangling data), use UUIDs as the primary key for all findings.

A. Researcher Stage

• Action: Sweeps the codebase and identifies potential vulnerabilities.
• LLM Output: Generates a unique UUID for each finding and writes

workspace/findings/.json containing the full details (matching the standard schema in [Mantis Researcher](../mantis_researcher/SKILL.md)).

B. Deduplication Stage (Optimized)

Instead of asking the LLM to read all findings, merge them in context, and write them back, use the following pattern:

1. Harness Action: Reads all *.json files and prepares a summary list for

the LLM containing only key identifiers. To align with the standard schema, map the code_paths array (which uses "file:line" format) to a simplified summary for the LLM: [ { "id": "UUID", "file": "path", "line": 12, "snippet": "..." } ].

1. LLM Action: Analyzes the summary and outputs a mapping of duplicates:

``json { "primary_uuid_1": ["duplicate_uuid_a", "duplicate_uuid_b"], "primary_uuid_2": [] } ``

1. Harness Action (Deterministic):

• Reads the content of the affected files.
• Programmatically merges fields following the rules in

[Mantis Deduplicator](../mantis_dedupe/SKILL.md) (e.g., union of code_paths, taking highest severity, concatenating history).

• Updates primary_uuid_1.json on disk.
• Deletes duplicate_uuid_a.json and duplicate_uuid_b.json.

C. Validation & Review Stages (Reviewer, Critic)

• Harness Action: For each finding UUID.json, pass only the relevant

code context and finding description to the LLM.

• LLM Action: Output only a structured verification result (e.g.,

{"valid": true, "reason": "..."}).

• Harness Action (Deterministic): Programmatically update the UUID.json

file with the validation status and reason.

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2. Adaptable Reproducers via Custom MCP

When validating findings, the agent may need to interact with diverse environments (VMs, physical hardware). Use the Model Context Protocol (MCP) to expose a clean, restricted API.

• Architecture: [Reproducer Agent] [Custom MCP Server] [Target Env]
• Custom Environments:
• VMs: Implement tools like reboot_vm(), execute_payload().
• Hardware/USB: Implement tools like power_cycle_device() (via smart

plug), send_usb_packet().

• Integration Note: If the user's harness uses raw LLM APIs (e.g., direct

Gemini API calls) instead of an MCP-native client framework, the harness must manually register these tools in the API's schema format and handle dispatching tool calls to the MCP server.

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3. Decomposition & Multi-Model Strategy

A. Pipeline Decomposition & Concurrency

The pipeline can be split into independent services. When scaling horizontally (e.g., multiple workers running the Reproducer stage in parallel):

• Concurrency Control: Implement database or file locking to ensure two

workers do not attempt to process or update the same finding simultaneously.

• Parallel Trajectory Search: For deep reasoning stages (Reproducer,

Patcher), spawn multiple parallel agents attempting to solve the exact same finding using diverse logic paths. For the Reproducer stage, prune all other trajectories as soon as one worker succeeds to save compute costs while escaping LLM "give up" loops. For the Patcher stage, wait for all patches to be generated and tested, then evaluate the successful ones to select the most minimal, idiomatic, and correct fix.

B. Heterogeneous LLM Selection (Multi-Model)

Match task complexity with the appropriate model tier:

• Frontier Models: For deep reasoning (Research, Reproduce, Patch).
• Flash/Lite Models: For structured utility tasks (Dedupe, Calibrate).
• Variability: Run different models in parallel during the Research stage to

increase bug-hunting coverage.

C. Importance of Evaluation

Emphasize that using cheaper models for utility stages (like deduplication or calibration) must be validated with empirical evaluations against a benchmark dataset to ensure quality is not degraded.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: google
• Source: google/mantis
• License: Apache-2.0
• Homepage: https://cloud.google.com/

Install and usage instructions live in the source repository linked above.