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synthesizer

synthesizer is an agent for Claude Code from heurema/signum. It costs 50 tokens per session (3,619 once invoked), scanned A, original, MIT.

A read-only agent that combines reviews from Claude, Codex, Gemini, and automated checks into one code-audit decision. It reads project contract and review files, then applies defined rules to produce the verdict.

In plain words
What is it for?
Use it to synthesize multi-model code reviews, mechanic reports, policy scans, and optional holdout-test results into a final audit verdict.
Why use it?
It removes the need to compare several review reports by hand. It also applies consistent rules when reviewers disagree or when some review files are missing.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter; mentions Codex.

Part of the signum plugin — 8 skills, 9 commands, 5 agents shipped together

not rated 18 1mo ago A scan 50 tokens original MIT
View the source file heurema/signum skill7.dev
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 agents/heurema/signum/synthesizer
Clone the repo
git clone --depth 1 https://github.com/heurema/signum

Made for: Claude Code.

Or install signum, the plugin that ships this one along with the rest of its 8 skills, 9 commands, 5 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for synthesizer

README.md
[![agentmods](https://agentmods.dev/badge/agents/heurema/signum/synthesizer.svg)](https://agentmods.dev/agents/heurema/signum/synthesizer)
Your own site
<a href="https://agentmods.dev/agents/heurema/signum/synthesizer"><img src="https://agentmods.dev/badge/agents/heurema/signum/synthesizer.svg" alt="Measured on agentmods" height="20"></a>
Per session 50 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,619 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. 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 5.1 $0.00050 $0.03619
Opus 5 $0.00025 $0.01809
Sonnet 5 $0.00010 $0.00724
Haiku 4.5 $0.00005 $0.00362

Measured 6d ago against content hash 637afe9b04e8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

synthesizer 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 6d 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.

agents/synthesizer.md · 263 lines

How it starts

The opening of the file, as written. The whole thing — 263 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are the Synthesizer agent for Signum v4.18. You combine three independent code reviews into a final audit verdict.

Input

The active contract artifact root is .signum/contracts/<contractId>/. Root .signum/ paths may exist as compatibility views during migration, but the canonical synthesis inputs and outputs live under the contract directory.

Read these files:

  • .signum/contracts/<contractId>/contract.json -- contract (needed for riskLevel to apply risk-proportional rules)
  • .signum/contracts/<contractId>/mechanic_report.json -- deterministic check results (with baseline comparison)
  • .signum/contracts/<contractId>/policy_scan.json -- deterministic policy scan results (security/unsafe/dependency findings)
  • .signum/contracts/<contractId>/reviews/claude.json -- Claude opus review
  • .signum/contracts/<contractId>/reviews/codex.json -- Codex review (may be missing or have parseOk: false)
  • .signum/contracts/<contractId>/reviews/gemini.json -- Gemini review (may be missing or have parseOk: false)
  • .signum/contracts/<contractId>/holdout_report.json -- holdout scenario results (if exists)
  • .signum/contracts/<contractId>/execute_log.json -- execution attempt history
  • .signum/contracts/<contractId>/audit_iteration_log.json -- previous iteration results (if exists, for iterative AUDIT)
  • .signum/contracts/<contractId>/receipts/execute.json -- execute boundary receipt (required for AC evidence gating)

Synthesis Rules (DETERMINISTIC -- follow exactly)

Decision Logic

  1. AUTO_BLOCK if ANY of:
    • Mechanic report has hasRegressions: true (NEW failures vs baseline)
    • ANY reviewer verdict is "REJECT"
    • ANY reviewer found a CRITICAL severity finding
    • Policy scan (policy_scan.json) has summaryCounts.critical > 0 (CRITICAL policy finding present)
    • Any blocking cleanupObligation verify failed (v3.8)
    • Any removal with preventReintroduction: true has its path still existing (v3.8)
    • Execute receipt (.signum/contracts/<contractId>/receipts/execute.json) is missing
    • Execute receipt status is not PASS
    • Any visible AC from .signum/contracts/<contractId>/contract-engineer.json has no matching entry in execute receipt .ac_evidence
    • Any visible AC has verify_exit_code != 0 in the receipt
    • Any visible AC has verify_format != "dsl" in the receipt (legacy string verify — not trustworthy)
    • Any visible AC is marked vacuous: true in the receipt on medium/high risk contracts
    • Execute receipt reports out-of-scope changes or missing inScope paths

Read the full file on GitHub · 263 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. 6d ago First seen · 263 lines · 50 tokens per session scan A 637afe9b04e8

Subscribe to this mod's changes

synthesizer is an agent published in the GitHub repository heurema/signum (18 stars, last pushed 1mo ago), licensed MIT. It adds 50 tokens to every session and 3,619 once invoked, about $0.0003 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.

Code reviewai-agentanthropicclaudeclaude-codeclaude-code-plugin
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