kb-fediverse-portable-objects

kb-fediverse-portable-objects is a skill for Claude Code from reiver/vibefed. It costs 256 tokens per session (3,971 once invoked), scanned A, original, no licence file.

Reference knowledge about portable objects and server-independent identity for ActivityPub, the protocol used by services such as federated social networks. It covers the ap:// address scheme, decentralized identifiers, gateways, resolvers, and integrity proofs.

In plain words
What is it for?
Use it when working with FEP-ef61 Portable Objects, ap:// addresses, DID methods such as did:key, or ActivityPub gateways and resolvers.
Why use it?
It helps explain how an identity or object can remain addressable across different ActivityPub servers. This reduces reliance on one hosting server when designing or implementing these systems.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter.

Part of the vibefed plugin — 29 skills shipped together

Good fit Use it when working with FEP-ef61 Portable Objects, ap:// addresses, DID methods such as did:key, or ActivityPub gateways and resolvers.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/reiver/vibefed/kb-fediverse-portable-objects
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 reiver/vibefed --skill kb-fediverse-portable-objects
Clone the repo
git clone --depth 1 https://github.com/reiver/vibefed

Made for: Claude Code.

Or install vibefed, the plugin that ships this one along with the rest of its 29 skills.

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 kb-fediverse-portable-objects

README.md
[![agentmods](https://agentmods.dev/badge/skills/reiver/vibefed/kb-fediverse-portable-objects.svg)](https://agentmods.dev/skills/reiver/vibefed/kb-fediverse-portable-objects)
Your own site
<a href="https://agentmods.dev/skills/reiver/vibefed/kb-fediverse-portable-objects"><img src="https://agentmods.dev/badge/skills/reiver/vibefed/kb-fediverse-portable-objects.svg" alt="Measured on agentmods" height="20"></a>
Per session 256 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,971 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00256 $0.03971
Opus 5 $0.00128 $0.01985
Sonnet 5 $0.00051 $0.00794
Haiku 4.5 $0.00026 $0.00397

Measured 8d ago against content hash 457d008a8fd6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

kb-fediverse-portable-objects 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 8d 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/kb-fediverse-portable-objects/SKILL.md · 424 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

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.

  1. 8d ago First seen · 424 lines · 256 tokens per session scan A 457d008a8fd6

Subscribe to this mod's changes

kb-fediverse-portable-objects is a skill published in the GitHub repository reiver/vibefed (9 stars, last pushed 5mo ago), with no licence file. It adds 256 tokens to every session and 3,971 once invoked, about $0.0013 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.

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