skysynth

skysynth is a skill for Claude Code from skydiscover-ai/skydiscover. It costs 57 tokens per session (8,082 once invoked), scanned A, original, Apache-2.0.

A workflow for building a system tailored to a stated workload or formal specification. It uses separate roles for requirements, planning, coding, evaluation, criticism, and auditing, then delivers tested or machine-checked results.

In plain words
What is it for?
Use it to synthesize specialized systems, clarify requirements, compare behavior with reference systems, and turn discovered shortcuts into new tests.
Why use it?
It breaks a complex build into reviewable stages and checks whether the result is correct rather than accepting code based only on its appearance.

Skill for Claude Code

Written for Claude Code: ${CLAUDE_PLUGIN_ROOT} variable. Also seen: reads .claude/ paths; mentions Claude Code; mentions Codex.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the skysynth plugin — 2 skills, 1 command, 2 hooks shipped together

Good fit Use it to synthesize specialized systems, clarify requirements, compare behavior with reference systems, and turn discovered shortcuts into new tests.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add skydiscover-ai/skydiscover
Claude Code
/plugin install skysynth

Made for: Claude Code.

Or install skysynth, the plugin that ships this one along with the rest of its 2 skills, 1 command, 2 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 skysynth

README.md
[![agentmods](https://agentmods.dev/badge/skills/skydiscover-ai/skydiscover/workflow/github.svg)](https://agentmods.dev/skills/skydiscover-ai/skydiscover/workflow)
Your own site
<a href="https://agentmods.dev/skills/skydiscover-ai/skydiscover/workflow"><img src="https://agentmods.dev/badge/skills/skydiscover-ai/skydiscover/workflow/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 skysynth

Your own site · 80×15
<a href="https://agentmods.dev/skills/skydiscover-ai/skydiscover/workflow"><img src="https://agentmods.dev/badge/skills/skydiscover-ai/skydiscover/workflow.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 57 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 8,082 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 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 $0.00057 $0.08082
Opus 5 $0.00028 $0.04041
Sonnet 5 $0.00011 $0.01616
Haiku 4.5 $0.00006 $0.00808

Measured yesterday against content hash 0cb44a0e79ea, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-13, from the pricing page.

Security

Grade A, and why

skysynth 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 yesterday.

The scan reads SKILL.md. This mod also ships 12 executable files (adapters/codex/agents.py, adapters/pi/skydiscover-hooks.ts, hooks/clone_reuse_guard.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skydiscover/synthesize/workflow/SKILL.md · 456 lines

How it starts

The opening of the file, as written. The whole thing — 456 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SkyDiscover-Synthesize (SkySynth): The Lead Workflow

You are the lead. The user names a system to build. You run the three stages of the SkySynth architecture below, handing each box to its role agent, and deliver a specialized system: proven or tested, benchmarked, assumptions explicit.

 Initial Specification        Synthesis Loop                          Final Deliverables
 ┌──────────────────────┐     ┌────────────────────────────────┐      ┌──────────────────────┐
 │ Spec Builder         │     │ Planner ─► Coding Agent        │      │ Specialized system   │
 │  ─► Specification    │ ──► │    ▲          │ (code, or      │ ──►  │  + tests or proof    │
 │  requirements,       │     │ Critic ◄─ Evaluator ─► Auditor │      │  + score and spec.md │
 │  environment,        │     │           correctness,  hack → │      │                      │
 │  workload, formal    │     │           performance   test   │      │                      │
 │  spec (optional)     │     │                 code + proof)  │      │                      │
 └──────────────────────┘     └────────────────────────────────┘      └──────────────────────┘
        Phase 1                          Phase 2                             Phase 3

The lead sequences the work, resolves handoffs, records decisions, and reports the result. It never does a role's job itself; each role writes its own files.

Files

The agents/ tree is the pipeline: one brief per role, filed under the phase that runs it.

workflow/
├── SKILL.md                  this file: the lead's procedure
├── agents/                   role briefs (agents/README.md is the map)
│   ├── 1-specification/      spec-builder, kb-builder (optional, background)
│   └── 2-synthesis-loop/     planner, coding-agent, dsa, isa, evaluator, auditor, critic
│                             (Phase 3 is the auditor's final review modes)
├── references/               shared rules; read one when its concern comes up
│   ├── artifacts.md          the run directory, who owns each file, the published result
│   ├── verification.md       tests, measurement rules, audits, release claims
│   └── state.md              the decision log, asking the user, state kept across runs
├── scripts/                  the test tools: validate_test, run_tests, the release checks;
│                             kb/ is the wiki schema and kbtool.py (find, page, validate, index)
├── hooks/                    the delivery hook and the clone-reuse guard the agent harness runs
└── adapters/                 entry points for Claude Code, Codex, and pi (Cursor needs none)

Read the full file on GitHub · 456 lines

Files

What ships with it

36 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. yesterday First seen · 456 lines · 57 tokens per session scan A 0cb44a0e79ea

Subscribe to this mod's changes

skysynth is a skill published in the GitHub repository skydiscover-ai/skydiscover (666 stars, last pushed 2d ago), licensed Apache-2.0. It adds 57 tokens to every session and 8,082 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 2026-09-12.

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