What is public-kafka-expert-base?

A reference guide to Apache Kafka, a system for sending and processing streams of events between applications. It explains topics, partitions, producers, consumers, message formats, delivery guarantees, and rebalancing.

Use it when designing topics and partitions, configuring producers or consumer groups, handling serialization, or working with exactly-once processing and rebalancing.

It helps developers choose Kafka settings and structures without having to piece together basic event-streaming concepts themselves.

public-kafka-expert-base — Skill for Claude Code and Codex by seed-for

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 seed-forge/harness-ai-kit --skill public-kafka-expert-base

Clone the repo

git clone --depth 1 https://github.com/seed-forge/harness-ai-kit

Made for: Claude Code, Codex.

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/seed-forge/harness-ai-kit/public-kafka-expert-base/github.svg)](https://agentmods.dev/skills/seed-forge/harness-ai-kit/public-kafka-expert-base)

Your own site

<a href="https://agentmods.dev/skills/seed-forge/harness-ai-kit/public-kafka-expert-base"><img src="https://agentmods.dev/badge/skills/seed-forge/harness-ai-kit/public-kafka-expert-base/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/seed-forge/harness-ai-kit/public-kafka-expert-base"><img src="https://agentmods.dev/badge/skills/seed-forge/harness-ai-kit/public-kafka-expert-base.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 51 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 725 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.

Model	Per session	Once invoked
Fable 5.1	$0.00051	$0.00725
Opus 5	$0.00026	$0.00362
Sonnet 5	$0.00010	$0.00145
Haiku 4.5	$0.00005	$0.00072

Measured 11d ago against content hash 55ddba01821a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

public-kafka-expert-base 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 11d 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.

skills/public-kafka-expert-base/SKILL.md · 64 lines

How it starts

The opening of the file, as written. The whole thing — 64 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Kafka Knowledge Base

Foundational guidance for building event streaming applications with Apache Kafka.

Source: Adapted from confluentinc/agent-skills and Apache Kafka best practices.

Topics & Partitions

Design topics around domain events (order.created, payment.completed), not database tables.
Partition count determines max consumer parallelism — start with 3-6, scale up as needed.
Partitions are ordered; messages within a partition have guaranteed order.
Use partition keys for related messages that must be ordered (e.g., user_id for user events).

Consumer Groups

All consumers in a group share the workload (each partition → one consumer).
Multiple groups can independently consume the same topic (fan-out).
Consumer offset tracking: committed offsets vs. current position.
Use auto.offset.reset=earliest for new groups that need to process all history.

Producer Configuration

Setting	Default	Recommended
`acks`	1	`all` (durability)
`retries`	0	3+ (transient failures)
`linger.ms`	0	5-100 (batching)
`batch.size`	16KB	32-64KB (throughput)
`compression.type`	none	`lz4` or `zstd`
`enable.idempotence`	true	always true

Consumer Configuration

Setting	Default	Recommended
`auto.offset.reset`	latest	`earliest` (first run)
`enable.auto.commit`	true	false (manual commit)
`max.poll.records`	500	Tune to processing capacity
`session.timeout.ms`	45s	10-30s (failure detection)
`heartbeat.interval.ms`	3s	session.timeout / 3

Serialization

Use Avro/Protobuf/JSON Schema with Schema Registry for type safety.
Never use Java serialization (not cross-language, not forward-compatible).
StringSerializer/StringDeserializer only for simple text messages.

Exactly-Once Semantics

Enable enable.idempotence=true on producer (prevents duplicates from retries).
Use isolation.level=read_committed on consumer (read only committed transactions).
For transactional processing: beginTransaction() → process → commitTransaction().

Read the full file on GitHub · 64 lines

Files

What ships with it

3 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.

11d ago First seen · 64 lines · 51 tokens per session scan A 55ddba01821a

Subscribe to this mod's changes

public-kafka-expert-base is a skill published in the GitHub repository seed-forge/harness-ai-kit (22 stars, last pushed 10d ago), licensed Apache-2.0. It adds 51 tokens to every session and 725 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 2026-08-30.

Backend and APIs Claude Code agent-skills ai-agents claude-skills codex cursor

public-kafka-expert-base

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

How it starts

Kafka Knowledge Base

Topics & Partitions

Consumer Groups

Producer Configuration

Consumer Configuration

Serialization

Exactly-Once Semantics

What ships with it

What this file has done since we first saw it

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