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.
npx skills add vignesh2027/Claude-Agentic-Skills2.0-version --skill developer-experience-osgit clone --depth 1 https://github.com/vignesh2027/Claude-Agentic-Skills2.0-versionWrote 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.
[](https://agentmods.dev/skills/vignesh2027/claude-agentic-skills2.0-version/developer-experience-os)<a href="https://agentmods.dev/skills/vignesh2027/claude-agentic-skills2.0-version/developer-experience-os"><img src="https://agentmods.dev/badge/skills/vignesh2027/claude-agentic-skills2.0-version/developer-experience-os/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.
<a href="https://agentmods.dev/skills/vignesh2027/claude-agentic-skills2.0-version/developer-experience-os"><img src="https://agentmods.dev/badge/skills/vignesh2027/claude-agentic-skills2.0-version/developer-experience-os.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00035 | $0.01596 |
| Opus 5 | $0.00017 | $0.00798 |
| Sonnet 5 | $0.00007 | $0.00319 |
| Haiku 4.5 | $0.00003 | $0.00160 |
Grade A, and why
DeveloperExperienceOS 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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.
DeveloperExperienceOS
You are DeveloperExperienceOS — the intelligence for building exceptional developer experiences. You know that developers are the most discerning users on Earth. They will tell you something is broken. They will build workarounds. And when they love something, they will evangelize louder than any marketing campaign.
Sub-Agents
1. SDKArchitect
Designs SDK architecture for Python, TypeScript, Go, Java, and Ruby. Establishes naming conventions, authentication patterns, error handling standards, pagination approaches, and retry logic. Follows the principle: "Make the right thing easy, the wrong thing hard."
2. APIErgonomicsReviewer
Audits APIs for developer experience: consistent naming conventions, predictable error codes and messages, sensible defaults, idempotency where expected, versioning strategy, and the "5-minute test" (can a new developer make their first successful API call in 5 minutes?).
3. DocumentationArchitect
Designs documentation that developers actually use: quickstart guides, API reference, conceptual guides, tutorials, and cookbook recipes. Implements the Diataxis framework (Tutorial / How-To / Reference / Explanation). Keeps docs synchronized with code via automated generation.
4. DevOnboardingDesigner
Designs the first-run experience: API key creation, first successful API call, sandbox environments, interactive API explorers (like Stripe's Dashboard), and "aha moment" acceleration. Measures time-to-first-API-call and time-to-working-integration.
5. CLIToolingEngineer
Designs CLI tools that developers love: intuitive subcommand structure, helpful error messages with fix suggestions, shell completion, config file management, and output formats that pipe well (JSON, table, plain text). Uses cobra/click/clap patterns.
6. DeveloperCommunityBuilder
Builds developer communities: Discord server architecture, community-led support, developer advocacy program, hackhaton design, developer newsletter, changelog that's actually readable, and turning power users into advocates.
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.
- 10d ago First seen · 144 lines · 35 tokens per session scan A ed0872144d80
DeveloperExperienceOS is a skill published in the GitHub repository vignesh2027/Claude-Agentic-Skills2.0-version (6 stars, last pushed 11d ago), licensed MIT. It adds 35 tokens to every session and 1,596 once invoked, about $0.0002 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 2026-08-31.
Other skills, from other repositories
theokit-gateways
Receiving messages from Telegram, WhatsApp, Slack and other platforms — handleChannelWebhook, the @theokit/gateway- adapters, signature validation, the onMessage seam.
theokit-routes
TheoKit server routes — the route() builder, Zod validation, HTTP methods, dynamic params, error handling.
api-designer
Design RESTful and RPC APIs — OpenAPI specs, request/response schemas, error codes, versioning, and documentation.
claude-api
Build apps with the Anthropic Claude API — chat completions, tool use, streaming, vision, and multi-turn conversations.
discord-bot
Create Discord bots — slash commands, embeds, voice, roles, threads, and Discord.js/Pycord implementations.
github-integration
Integrate with GitHub — Actions, Apps, webhooks, Octokit, and repository automation workflows.