What is data-substrate-analysis?

A code-analysis tool for examining data types, core data structures, and state management patterns. State management is how a program stores, changes, and passes information over time.

It is for comparing typing approaches such as Pydantic, TypedDict, and loose dictionaries; reviewing mutation and immutability; examining serialization; and documenting state life cycles.

It helps reveal how data is shaped, changed, converted, and kept consistent across a codebase.

How Dowwie/agent_framework_study configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Dowwie/agent_framework_study. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/Dowwie/agent_framework_study/main/.claude/skills/data-substrate-analysis/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/Dowwie/agent_framework_study

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/dowwie/agent_framework_study/data-substrate-analysis/github.svg)](https://agentmods.dev/skills/dowwie/agent_framework_study/data-substrate-analysis)

Your own site

<a href="https://agentmods.dev/skills/dowwie/agent_framework_study/data-substrate-analysis"><img src="https://agentmods.dev/badge/skills/dowwie/agent_framework_study/data-substrate-analysis/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/dowwie/agent_framework_study/data-substrate-analysis"><img src="https://agentmods.dev/badge/skills/dowwie/agent_framework_study/data-substrate-analysis.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 80 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 950 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 unknown 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.

Model	Per session	Once invoked
Fable 5.1	$0.00080	$0.00950
Opus 5.5	$0.00032	$0.00380
Sonnet 5.5	$0.00016	$0.00190
Haiku 4.5	$0.00008	$0.00095

Measured 2mo ago against content hash 02c0667f14c8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

data-substrate-analysis 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 2mo 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.

.claude/skills/data-substrate-analysis/SKILL.md · 125 lines

The source is not reproduced here

No licence file

Read it on GitHub

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.

2mo ago First seen · 125 lines · 80 tokens per session scan A 02c0667f14c8

Subscribe to this mod's changes

data-substrate-analysis is a skill published in the GitHub repository Dowwie/agent_framework_study (5 stars, last pushed 10mo ago), with no licence file. It adds 80 tokens to every session and 950 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-08-31.

Debugging

data-substrate-analysis next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
data-substrate-analysisDowwie/agent_framework_study	Skill	5	10mo ago	none	A	80	Claude Code
systematic-debuggingopen-metadata/OpenMetadata	Skill	16k	yesterday	Apache-2.0	A	37	Claude Code
log-error-digestzebbern/claude-code-guide	Skill	4.7k	3d ago	MIT	A	71	Claude Code, Codex
cwv-optimizeradobe/skills	Skill	319	yesterday	Apache-2.0	A	112	Claude Code
ci-fixersipyourdrink-ltd/bernstein	Skill	1.2k	yesterday	Apache-2.0	A	15	Claude Code, Codex
incident-response-incident-responsermyndharis/antigravity-skills	Skill	1.9k	23d ago	MIT	A	36	Claude Code
triaging-web-analytics-supportPostHog/posthog	Skill	41k	yesterday	none	A	151	Claude Code, Codex

agent_framework_study: Skill for Claude Code