ferrox-assumptions-analyzer

ferrox-assumptions-analyzer is an agent for Claude Code from FerroxLabs/ferrox-factory. It costs 31 tokens per session (1,063 once invoked), scanned A, a copy of gsd-assumptions-analyzer, MIT.

An analysis agent that examines a codebase and project plans to identify assumptions for a development phase. It gathers evidence from relevant files and flags questions that cannot be answered from the code alone.

In plain words
What is it for?
Use it during phase-planning discussions to inspect related components and patterns, document assumptions with file evidence, and identify topics needing outside research.
Why use it?
It helps expose hidden decisions and uncertainties before implementation begins. This reduces the chance of planning a feature around guesses rather than existing code and project context.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: reads .claude/ paths.

Part of the ferrox-core plugin — 81 skills, 42 agents, 7 hooks shipped together

Good fit Use it during phase-planning discussions to inspect related components and patterns, document assumptions with file evidence, and identify topics needing outside research.

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Install with agentmods
npx agentmods add agents/ferroxlabs/ferrox-factory/ferrox-assumptions-analyzer
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.

Clone the repo
git clone --depth 1 https://github.com/FerroxLabs/ferrox-factory

Made for: Claude Code.

Or install ferrox-core, the plugin that ships this one along with the rest of its 81 skills, 42 agents, 7 hooks.

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 ferrox-assumptions-analyzer

README.md
[![agentmods](https://agentmods.dev/badge/agents/ferroxlabs/ferrox-factory/ferrox-assumptions-analyzer.svg)](https://agentmods.dev/agents/ferroxlabs/ferrox-factory/ferrox-assumptions-analyzer)
Your own site
<a href="https://agentmods.dev/agents/ferroxlabs/ferrox-factory/ferrox-assumptions-analyzer"><img src="https://agentmods.dev/badge/agents/ferroxlabs/ferrox-factory/ferrox-assumptions-analyzer.svg" alt="Measured on agentmods" height="20"></a>
Per session 31 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,063 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 97% copy Near-identical to another mod 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 $0.00031 $0.01063
Opus 5 $0.00015 $0.00531
Sonnet 5 $0.00006 $0.00213
Haiku 4.5 $0.00003 $0.00106

Measured 8d ago against content hash 9e43469ff884, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

ferrox-assumptions-analyzer 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 8d 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.

Origin

This is a copy

97% identical to gsd-assumptions-analyzer — 10 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

agents/ferrox-assumptions-analyzer.md · 110 lines

How it starts

The opening of the file, as written. The whole thing — 110 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Spawned by discuss-phase-assumptions via Task(). You do NOT present output directly to the user -- you return structured output for the main workflow to present and confirm.

Core responsibilities:

  • Read the ROADMAP.md phase description and any prior CONTEXT.md files
  • Search the codebase for files related to the phase (components, patterns, similar features)
  • Read 5-15 most relevant source files
  • Produce structured assumptions citing file paths as evidence
  • Flag topics where codebase analysis alone is insufficient (needs external research)

@~/.claude/ferrox-core/references/untrusted-input-boundary.md

agent_skills: self-load per @~/.claude/ferrox-core/references/agent-skills-bootstrap.md

  • <phase> -- phase number and name
  • <phase_goal> -- phase description from ROADMAP.md
  • <prior_decisions> -- summary of locked decisions from earlier phases
  • <codebase_hints> -- scout results (relevant files, components, patterns found)
  • <calibration_tier> -- one of: full_maturity, standard, minimal_decisive

<calibration_tiers> The calibration tier controls output shape. Follow the tier instructions exactly.

full_maturity

  • Areas: 3-5 assumption areas
  • Alternatives: 2-3 per Likely/Unclear item
  • Evidence depth: Detailed file path citations with line-level specifics

standard

  • Areas: 3-4 assumption areas
  • Alternatives: 2 per Likely/Unclear item
  • Evidence depth: File path citations

minimal_decisive

  • Areas: 2-3 assumption areas
  • Alternatives: Single decisive recommendation per item
  • Evidence depth: Key file paths only </calibration_tiers>

Read the full file on GitHub · 110 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. 8d ago First seen · 110 lines · 31 tokens per session scan A 9e43469ff884

Subscribe to this mod's changes

ferrox-assumptions-analyzer is an agent published in the GitHub repository FerroxLabs/ferrox-factory (22 stars, last pushed 1mo ago), licensed MIT. It adds 31 tokens to every session and 1,063 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 97% identical to gsd-assumptions-analyzer, differing in 10 lines, and is treated as a copy.

Related

Other agents, from other repositories