fabsol

fabsol is a skill for Claude Code from AiAi-Mastermind/aiai-mastermind-tools-and-skills. It costs 69 tokens per session (1,470 once invoked), scanned A, original, MIT.

A development workflow where one model plans, writes specifications, and verifies the result while another model performs the building through a local proxy.

In plain words
What is it for?
Use it for real build tasks that need planning, delegated implementation, and verification.
Why use it?
It divides thinking and checking from implementation, giving the worker a clear specification to follow during a build.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the model-router plugin — 3 skills, 3 commands, 1 agent shipped together

Good fit Use it for real build tasks that need planning, delegated implementation, and verification.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/aiai-mastermind/aiai-mastermind-tools-and-skills/fabsol
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.

Any agent
npx skills add AiAi-Mastermind/aiai-mastermind-tools-and-skills --skill fabsol
Clone the repo
git clone --depth 1 https://github.com/AiAi-Mastermind/aiai-mastermind-tools-and-skills

Made for: Claude Code.

Or install model-router, the plugin that ships this one along with the rest of its 3 skills, 3 commands, 1 agent.

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 fabsol

README.md
[![agentmods](https://agentmods.dev/badge/skills/aiai-mastermind/aiai-mastermind-tools-and-skills/fabsol/github.svg)](https://agentmods.dev/skills/aiai-mastermind/aiai-mastermind-tools-and-skills/fabsol)
Your own site
<a href="https://agentmods.dev/skills/aiai-mastermind/aiai-mastermind-tools-and-skills/fabsol"><img src="https://agentmods.dev/badge/skills/aiai-mastermind/aiai-mastermind-tools-and-skills/fabsol/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for fabsol

Your own site · 80×15
<a href="https://agentmods.dev/skills/aiai-mastermind/aiai-mastermind-tools-and-skills/fabsol"><img src="https://agentmods.dev/badge/skills/aiai-mastermind/aiai-mastermind-tools-and-skills/fabsol.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 69 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,470 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
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 $0.00069 $0.01470
Opus 5 $0.00034 $0.00735
Sonnet 5 $0.00014 $0.00294
Haiku 4.5 $0.00007 $0.00147

Measured 12d ago against content hash f2a4f6e78465, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

fabsol scanned grade A with 1 finding 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 12d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -s "${MODEL_ROUTER_URL:-http://127.0.0.1:8317}/v1/models" \
skills/model-router/skills/fabsol/SKILL.md · 118 lines

How it starts

The opening of the file, as written. The whole thing — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.

FabSol - the orchestrator + worker build flow

This is the flow that combines the two models. The name is Fable + Sol, but it works with any pair: your main session model orchestrates, and whatever model MODEL_ROUTER_MODEL points at does the building.

You are the ORCHESTRATOR, running on this session's normal login - NEVER route this session through the proxy. All building is delegated to the WORKER model via headless claude -p calls through the local proxy (CLIProxyAPI), which holds the user's other subscription logins.

Configuration (all changeable - see the README's "Change the defaults")

Setting Env var Ships as
Proxy URL MODEL_ROUTER_URL http://127.0.0.1:8317
Proxy key MODEL_ROUTER_KEY my-proxy-key (an api-keys entry in your proxy config.yaml)
Worker model MODEL_ROUTER_MODEL gpt-5.6-sol
Worker effort MODEL_ROUTER_EFFORT low
Worker turn cap --max-turns in the call below 20

The worker ships cheap-and-fast (low effort, bare harness, 20-turn cap) and holds up because the spec you write carries the thinking. If builds keep missing acceptance criteria, raise the effort to medium. Bigger multi-file tasks getting cut off: raise the turn cap.

The worker delegation call (Bash, one per build task)

ANTHROPIC_BASE_URL="${MODEL_ROUTER_URL:-http://127.0.0.1:8317}" \
ANTHROPIC_AUTH_TOKEN="${MODEL_ROUTER_KEY:-my-proxy-key}" \
claude -p "<self-contained task spec>" \
  --model "${MODEL_ROUTER_MODEL:-gpt-5.6-sol}" \
  --effort "${MODEL_ROUTER_EFFORT:-low}" \
  --bare --max-turns 20 --permission-mode acceptEdits \
&& ls -la <expected output paths> \
&& grep -c "<acceptance marker>" <built file>

--bare is safe for the worker because its auth comes from the env vars on the call, not a stored login. The && ls && grep tail is not decoration - it is how the build's proof comes back in the same tool result (rule 2 below).

ORCHESTRATOR EFFICIENCY RULES (non-negotiable)

Read the full file on GitHub · 118 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. 12d ago First seen · 118 lines · 69 tokens per session scan A f2a4f6e78465

Subscribe to this mod's changes

fabsol is a skill published in the GitHub repository AiAi-Mastermind/aiai-mastermind-tools-and-skills (2 stars, last pushed 1mo ago), licensed MIT. It adds 69 tokens to every session and 1,470 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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