What is social-mastodon?

A command-line tool for using Mastodon, a network of independently run social-media servers. It can publish, reply to, delete, and read posts, upload media, and inspect timelines, notifications, and profiles.

Use it to automate posts and replies, review your home timeline or notifications, manage media, and look up profiles on a Mastodon server.

It provides one scripted interface for Mastodon actions instead of requiring manual use of a web or desktop client. A dry-run option lets you check a request before sending it.

social-mastodon — Skill for Claude Code by isaacrowntree

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 isaacrowntree/claude-social-skills --skill social-mastodon

Clone the repo

git clone --depth 1 https://github.com/isaacrowntree/claude-social-skills

Made for: Claude Code.

Or install social, the plugin that ships this one along with the rest of its 10 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/isaacrowntree/claude-social-skills/social-mastodon/github.svg)](https://agentmods.dev/skills/isaacrowntree/claude-social-skills/social-mastodon)

Your own site

<a href="https://agentmods.dev/skills/isaacrowntree/claude-social-skills/social-mastodon"><img src="https://agentmods.dev/badge/skills/isaacrowntree/claude-social-skills/social-mastodon/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/isaacrowntree/claude-social-skills/social-mastodon"><img src="https://agentmods.dev/badge/skills/isaacrowntree/claude-social-skills/social-mastodon.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 917 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	$0.00070	$0.00917
Opus 5.5	$0.00028	$0.00367
Sonnet 5.5	$0.00014	$0.00183
Haiku 4.5	$0.00007	$0.00092

Measured 1mo ago against content hash b0ec1c00258f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

social-mastodon 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 1mo 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/social-mastodon/SKILL.md · 98 lines

How it starts

The opening of the file, as written. The whole thing — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Mastodon (any instance): post, reply, delete, upload media, home timeline, notifications, profiles.

Run: social mastodon <command> (installed via bun link in this repo, or bun run /path/to/claude-social-skills/src/cli.ts mastodon …). Add --dry-run before any command to print the request instead of sending it.

Credentials

MASTODON_INSTANCE
MASTODON_ACCESS_TOKEN

MASTODON_INSTANCE is your server's host (e.g. mastodon.social). Get MASTODON_ACCESS_TOKEN from Preferences → Development → New application (scopes read, write) on that server, or run social auth login mastodon.

Check what is present with social auth status mastodon; store a value with social auth set mastodon <KEY> <value> (OS keyring, else ~/.config/social/.env); run the interactive flow with social auth login mastodon. Docs: https://docs.joinmastodon.org/client/token/

API description this wrapper is built from

openapi: https://raw.githubusercontent.com/abraham/mastodon-openapi/main/dist/schema.json. Refresh with bun run gen; CI fails if upstream changes.

Commands

Every command accepts --json (raw JSON) and --jq <expr> (filter the JSON with jq).

`social mastodon post <text>`

publish a status

  --reply-to <id>            reply to a status id
  --visibility <v>           public | unlisted | private | direct
  --cw <text>                content warning (spoiler_text)
  --media <files...>         attach local files (uploaded via /api/v2/media first)

`social mastodon delete <id>`

delete a status you posted

`social mastodon upload <file>`

upload an image/video for --media; prints the attachment id

  --description <alt>        alt text

`social mastodon timeline`

your home timeline

  -n, --max <n>              count (max 40) (default "20")

`social mastodon profile <acct>`

look up an account by username or user@domain (no token needed)

`social mastodon me`

the authenticated account

Read the full file on GitHub · 98 lines

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.

1mo ago First seen · 98 lines · 0 tokens per session scan A b0ec1c00258f

Subscribe to this mod's changes

social-mastodon is a skill published in the GitHub repository isaacrowntree/claude-social-skills (4 stars, last pushed 1mo ago), licensed MIT. It adds 70 tokens to every session and 917 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 2026-09-19.

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social-mastodon