What is fopost-mcp CLAUDE.md?

A set of project instructions for building the FoPost MCP server, including its purpose, brand rules, architecture, dependencies, and commands.

It guides development of an npm-published TypeScript server that exposes FoPost social-media and AI functions to MCP-compatible clients.

It keeps changes aligned with the repository's API contract, runtime requirements, package-size goals, and naming rules.

How fopost/fopost-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to fopost/fopost-mcp. 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/fopost/fopost-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/fopost/fopost-mcp

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/instructions/fopost/fopost-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/fopost/fopost-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/fopost/fopost-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/fopost/fopost-mcp/claude-md/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/instructions/fopost/fopost-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/fopost/fopost-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,642 This file is loaded in full into every session.

When invoked 2,642 The same file — it is already loaded in full.

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	$0.02642	$0.02642
Opus 5.5	$0.01057	$0.01057
Sonnet 5.5	$0.00528	$0.00528
Haiku 4.5	$0.00264	$0.00264

Measured 10d ago against content hash 0a8bed5f426a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fopost-mcp CLAUDE.md 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.

CLAUDE.md · 187 lines

How it starts

The opening of the file, as written. The whole thing — 187 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Guidance for Claude Code (claude.ai/code) when working in this repository.

What This Is

@fopost/mcp — a Model Context Protocol server that exposes the FoPost REST API as MCP tools, so any MCP-aware client (Claude Desktop, Cursor, ChatGPT desktop, Continue) can list, schedule, edit, and publish social posts, inspect account health, run the AI features, work the inbox, and manage ads. Published on npm and run with npx -y @fopost/mcp. TypeScript, ESM only, Node >= 18, bin fopost-mcp, MIT.

It does not depend on @fopost/sdk. src/client.ts is a ~90-line fetch wrapper written in this repo, and the only runtime dependencies are @modelcontextprotocol/sdk, zod, and zod-to-json-schema. Do not add the SDK "to share code" — the whole point of the hand-rolled client is that the published tarball stays tiny and has no FoPost dependency to keep in lockstep. It is still bound by the API contract in fopost-api-collections/openapi.json and breaks when that contract changes.

Brand Rules

The product is FoPost (fopost.com). Never write "OwlStack" — retired Aug 2026.
Never write an email address. Support is https://fopost.com/contact and GitHub issues.
Never name AI providers/models, infrastructure vendors, or any person. Tool descriptions and error text are user-facing: name the FoPost feature, never the model behind it.

Architecture

src/index.ts       stdio entry: readConfig, createServer, connect the transport
src/server.ts      readConfig, buildTools, listTools, createToolCaller (errors, redaction, burst cap)
src/annotations.ts readOnlyHint / destructiveHint per tool, derived from the name's verb
src/client.ts      FoPostClient (fetch) + FoPostApiError, seg() and assertSafePath()
src/types.ts       ToolDefinition<S> — name, description, Zod inputSchema, typed execute
src/tools/         posts.ts (7 tools), accounts.ts (26), ai.ts (4), inbox.ts (23), ads.ts (47) — 107 total
src/globals.d.ts   declares __PKG_VERSION__, injected by tsup from package.json

Read the full file on GitHub · 187 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.

10d ago Changed · +17 lines · +289 tokens per session 0a8bed5f426a
19d ago Changed · -5 tokens per session 5aae308ffce4
1mo ago Changed · +30 lines · +408 tokens per session a10e96a573f8
1mo ago Changed · +2 lines · +71 tokens per session 33c6a20b57d7
2mo ago First seen · 138 lines · 1,879 tokens per session scan A 28ab74d3a00e

Subscribe to this mod's changes

fopost-mcp CLAUDE.md is an instructions file published in the GitHub repository fopost/fopost-mcp (0 stars, last pushed 3d ago), licensed MIT. It adds 2,642 tokens to every session, about $0.0106 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 2026-08-31.

agent fopost fopost-api mcp mcp-client

fopost-mcp CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
fopost-mcp CLAUDE.mdfopost/fopost-mcp	Instructions file	0	3d ago	MIT	A	2,642	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

fopost-mcp: Instructions file for Claude Code