What is ecosystem-primer?

A starting guide for building agents with LangChain, LangGraph, or Deep Agents, which are frameworks for creating software agents powered by language models. It helps choose the framework and approach before other project work begins.

Use it at the beginning of an agent-building project to choose between LangChain, LangGraph, Deep Agents, or a combination, then plan installation and setup.

These frameworks serve different purposes, and choosing one without understanding the differences can lead to unnecessary rewrites. The guide also covers setup and current framework choices.

How caio-moliveira/workshop-agent-harness configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to caio-moliveira/workshop-agent-harness. 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/caio-moliveira/workshop-agent-harness/main/.claude/skills/ecosystem-primer/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/caio-moliveira/workshop-agent-harness

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/caio-moliveira/workshop-agent-harness/ecosystem-primer/github.svg)](https://agentmods.dev/skills/caio-moliveira/workshop-agent-harness/ecosystem-primer)

Your own site

<a href="https://agentmods.dev/skills/caio-moliveira/workshop-agent-harness/ecosystem-primer"><img src="https://agentmods.dev/badge/skills/caio-moliveira/workshop-agent-harness/ecosystem-primer/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/caio-moliveira/workshop-agent-harness/ecosystem-primer"><img src="https://agentmods.dev/badge/skills/caio-moliveira/workshop-agent-harness/ecosystem-primer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 71 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,748 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	$0.00071	$0.01748
Opus 5.5	$0.00028	$0.00699
Sonnet 5.5	$0.00014	$0.00350
Haiku 4.5	$0.00007	$0.00175

Measured 2mo ago against content hash 51d6ea5520c7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ecosystem-primer 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/ecosystem-primer/SKILL.md · 192 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 · 192 lines · 71 tokens per session scan A 51d6ea5520c7

Subscribe to this mod's changes

ecosystem-primer is a skill published in the GitHub repository caio-moliveira/workshop-agent-harness (22 stars, last pushed 4mo ago), with no licence file. It adds 71 tokens to every session and 1,748 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 2026-08-30.

Building agents

ecosystem-primer next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
ecosystem-primercaio-moliveira/workshop-agent-harness	Skill	22	4mo ago	none	A	71	Claude Code
imagegenopenai/codex	Skill	133k	yesterday	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	yesterday	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	4d ago	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	313k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	103	Claude Code

workshop-agent-harness: Skill for Claude Code