mars-llm 0.0.3

Multi-Agent Resolution Synthesis — LLMs debate to find the best answer

MARS — Multi-Agent Resolution Synthesis

Multiple LLMs debate your question through structured rounds of argumentation, critique, and synthesis to produce a single, well-reasoned answer.

Installation

Requires Python 3.11+.

pip install mars-llm

Quick Start

1. Configure your API keys (one-time setup):

mars configure

This walks you through setting up API keys for each provider interactively. You need at least two providers configured to run a debate.

2. Run a debate:

mars debate "What is the best sorting algorithm for nearly-sorted data?"

3. View the results:

mars show

4. Check provider status anytime:

mars providers

CLI Reference

mars debate PROMPT [OPTIONS]

Run a multi-LLM debate on PROMPT. PROMPT can be plain text or @file to read from a file.

Option	Default	Description
PROMPT	(required)	Question or @file path
-c, --context		Context text or @file (repeatable)
-p, --provider	openai anthropic	Provider name or provider:model (repeatable)
-m, --mode	round-robin	Debate mode: round-robin or judge
-r, --rounds	3	Maximum debate rounds
-j, --judge-provider		Provider to act as judge (judge mode)
-s, --synthesis-provider		Provider for final synthesis (auto if omitted)
--model		provider:model override (repeatable)
--threshold	0.85	Convergence similarity threshold (0.0-1.0)
--max-tokens	8192	Max output tokens per LLM call
-t, --temperature	(provider default)	Temperature (0.0-2.0)
-v, --verbose	off	Stream responses in real-time
-o, --output-dir	./mars-output	Output directory

mars configure

Interactive setup for API keys and integrations. Prompts for each provider's API key, validates it, and stores keys in ~/.mars/config. Optionally sets up Claude Code integration.

mars providers

List configured providers with their default models and configuration status.

mars show [SUBCOMMAND]

View results of a completed debate. With no subcommand, shows a compact summary.

Subcommand	Description
(none)	Compact summary: prompt, providers, cost, attribution, answer
answer	Final synthesized answer only
costs	Token usage and cost breakdown
attribution	Per-provider contribution and influence metrics
rounds	Round-by-round responses and diffs

Option	Default	Description
--debate	(most recent)	Path to a specific debate directory
-o, --output-dir	./mars-output	Output directory

mars history

List past debates with timestamps, providers, rounds, and costs.

Option	Default	Description
-n, --limit	(all)	Show only the last N debates
-o, --output-dir	./mars-output	Output directory

mars copy

Copy the final answer to the system clipboard.

Option	Default	Description
--full	off	Include prompt, answer, and attribution
--debate	(most recent)	Path to a specific debate directory
-o, --output-dir	./mars-output	Output directory

Configuration

MARS looks for API keys in three places (highest priority wins):

Source	Example	Priority
Environment variables	export MARS_OPENAI_API_KEY=sk-...	Highest
Local .env file	MARS_OPENAI_API_KEY=sk-... in .env	Medium
Global config	~/.mars/config (set by mars configure)	Lowest

This means you can set keys globally with mars configure and override them per-project with a local .env file if needed.

Providers

Provider	Config Variable	Default Model
openai	MARS_OPENAI_API_KEY	gpt-4o
anthropic	MARS_ANTHROPIC_API_KEY	claude-sonnet-4-20250514
google	MARS_GOOGLE_API_KEY	gemini-2.0-flash
vertex	MARS_VERTEX_PROJECT_ID	claude-opus-4-6
ollama	MARS_OLLAMA_BASE_URL	llama3.2

Override models per-run with -p provider:model or --model provider:model.

Vertex AI (Google Cloud)

Vertex AI acts as a gateway to both Claude and Gemini models through a single authentication mechanism (Application Default Credentials).

Setup:

gcloud auth application-default login
mars configure   # enter your GCP project ID and region

Use -p vertex:model to specify models. The same vertex provider routes to Claude or Gemini based on the model name:

# Claude via Vertex
mars debate "Question" -p vertex:claude-sonnet-4 -p openai

# Gemini via Vertex
mars debate "Question" -p vertex:gemini-2.5-flash -p openai

# Both Claude and Gemini via Vertex
mars debate "Question" \
  -p vertex:claude-sonnet-4 \
  -p vertex:gemini-2.5-flash

Vertex AI config variables:

Variable	Description
MARS_VERTEX_PROJECT_ID	GCP project ID
MARS_VERTEX_REGION	GCP region (default: us-central1)

Auto-detected from ANTHROPIC_VERTEX_PROJECT_ID, GOOGLE_CLOUD_PROJECT, and CLOUD_ML_REGION if set.

Default Providers

Set default providers so you don't need -p every time:

mars configure   # prompted at the end for default providers

Or set MARS_DEFAULT_PROVIDERS directly:

export MARS_DEFAULT_PROVIDERS="vertex:claude-opus-4-6,vertex:gemini-2.5-flash"

Debate Modes

Round-Robin (default)

All providers answer the prompt independently. Each provider then critiques the others' answers and produces an improved response. This repeats until answers converge (similarity exceeds --threshold) or max rounds are reached. A final synthesis step merges the best points into one answer.

Judge

All providers answer independently. A designated judge provider (-j) evaluates every response and produces a final ruling with resolution reasoning.

mars debate "Is Rust better than Go for CLI tools?" \
  -p openai -p anthropic -p google \
  -m judge -j anthropic

Examples

Basic two-provider debate:

mars debate "What are the trade-offs between microservices and monoliths?"

Three providers with model overrides:

mars debate "Design a rate limiter" \
  -p openai -p anthropic -p google \
  --model openai:gpt-4.1 --model anthropic:claude-opus-4-20250514

Using context files:

mars debate @question.md -c @codebase-summary.txt -c @requirements.txt

Vertex AI — Claude vs Gemini:

mars debate "Best practices for API versioning" \
  -p vertex:claude-sonnet-4 \
  -p vertex:gemini-2.5-flash -v

Tuning convergence and temperature:

mars debate "Optimal database indexing strategy" \
  -p openai -p anthropic \
  --threshold 0.70 -t 0.3 -r 5

Reviewing results after a debate:

mars show                    # summary of most recent debate
mars show answer             # just the final answer
mars show costs              # cost breakdown
mars history                 # list all past debates
mars history -n 5            # last 5 debates
mars copy                    # copy final answer to clipboard
mars copy --full             # copy prompt + answer + attribution

Output Structure

Each debate produces a timestamped directory:

mars-output/<timestamp>_<slug>/
├── final-answer.md
└── audit/
    ├── 00-prompt-and-context.md
    ├── 01-round-1-responses.md
    ├── 02-round-2-critiques.md
    ├── 03-round-3-critiques.md
    ├── attribution.md
    ├── costs.md
    ├── round-diffs.md
    ├── convergence.md
    └── resolution.md

File	Contents
final-answer.md	The synthesized final answer
00-prompt-and-context.md	Original prompt and all context
NN-round-N-responses.md	Each provider's response for that round
NN-round-N-critiques.md	Cross-critiques and improved answers
attribution.md	Per-provider contribution, survival, and influence metrics
costs.md	Token counts and estimated cost per provider
round-diffs.md	How each provider's answer changed between rounds
convergence.md	Why the debate stopped (converged or max rounds)
resolution.md	Synthesis reasoning: which points were accepted/rejected

Analysis Output

Attribution

Three metrics per provider, computed via sentence-level similarity:

• Contribution — percentage of final answer sentences traced to this provider (best-match attribution above threshold).
• Survival — percentage of this provider's round-1 sentences that appear in the final answer.
• Influence — rate at which other providers adopted this provider's sentences in subsequent rounds.

Cost Tracking

Token counts (input + output) and estimated USD cost per provider. Pricing uses prefix-matched model lookup (e.g., claude-sonnet-4-20250514 matches claude-sonnet-4 pricing). Ollama models show zero cost.

Claude Code Integration

mars configure detects Claude Code and offers to install /mars:debate as a slash command. Once installed, you can run debates from any Claude Code session:

/mars:debate What is the best approach to database sharding?
/mars:debate Compare Kubernetes vs Docker Swarm for container orchestration

Claude Code will check your configured providers, run the debate with streaming output, and summarize the result.

Configuration Tips

Temperature: 0.0 for deterministic/factual answers, 0.7 for creative tasks, 1.0+ for experimental diversity. Each provider uses its own default when -t is omitted.

Convergence threshold: Lower values (e.g., 0.70) stop debate sooner when answers are roughly similar. Higher values (e.g., 0.95) force more rounds of refinement. Default 0.85 balances quality and cost.

Synthesis provider: By default, MARS prefers Anthropic then OpenAI for synthesis. Use -s to override.

Retries: All provider calls retry up to 3 times with exponential backoff on transient errors (timeouts, rate limits, 503s).

License

MIT