What is claude-plugin-external CLAUDE.md?

Repository instructions for an Intercom integration used with Claude Code. The integration consists of Markdown skills and a remote service that connects Claude Code to Intercom workspaces.

Use it when editing the Intercom plugin, its skills, manifest, settings, or remote-service routing, including messenger installation, customer analysis, and customer-360 workflows.

It explains the project structure and runtime flow so developers can work on the integration without looking for a build system or compiled application that is not there.

claude-plugin-external CLAUDE.md — Instructions file by intercom

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.

agentmods

npx agentmods add instructions/intercom/claude-plugin-external/claude-md

Clone the repo

git clone --depth 1 https://github.com/intercom/claude-plugin-external

Per session 667 This file is loaded in full into every session.

When invoked 667 The same file — it is already loaded in full.

Security scan A 0 findings. Scan, not verified.

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	$0.00667	$0.00667
Opus 5	$0.00333	$0.00333
Sonnet 5	$0.00133	$0.00133
Haiku 4.5	$0.00067	$0.00067

Measured 2d ago against content hash 971eb0d68ebd, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

claude-plugin-external 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 2d 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 · 55 lines

How it starts

The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

What This Is

Intercom plugin for Claude Code — a skill-based integration (not compiled code). Skills are pure Markdown files that Claude reads at runtime to interact with Intercom workspaces via a remote MCP server.

Architecture

User → Claude Code CLI → Skill (SKILL.md) → MCP Server (https://mcp.intercom.com/mcp) → Intercom API

No build step, no dependencies, no tests. The plugin is entirely declarative.
.mcp.json routes the intercom namespace to the remote HTTP-based MCP server.
.claude-plugin/plugin.json is the plugin manifest for Claude Code's plugin registry.
.claude/settings.local.json manages local permissions (currently allows WebFetch from raw.githubusercontent.com).

Skills

Three skills live under skills/, each in its own directory:

Skill	Trigger	Key Files
`install-messenger`	Explicit: `/intercom:install-messenger [framework]`	`SKILL.md`, `references/framework-guides.md`
`intercom-analysis`	Auto-triggered by keywords	`SKILL.md`, `references/mcp-tools.md`
`customer-360`	Explicit: `/intercom:customer-360 [email or company name]`	`SKILL.md`

Skill File Structure

Each skill directory contains:

SKILL.md — Main skill file with YAML frontmatter (name, description, optional disable-model-invocation, argument-hint) followed by Markdown instructions Claude reads at runtime.
references/ — Supplementary docs loaded on demand for progressive disclosure (keeps SKILL.md concise).

Invocation Modes

Auto-triggered: No disable-model-invocation in frontmatter. Claude activates the skill when the user's intent matches the description field.
Explicit: disable-model-invocation: true in frontmatter. Only invoked via /intercom:<skill-name>.

Read the full file on GitHub · 55 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.

2d ago First seen · 55 lines · 667 tokens per session scan A 971eb0d68ebd

Subscribe to this mod's changes

claude-plugin-external CLAUDE.md is an instructions file published in the GitHub repository intercom/claude-plugin-external (2 stars, last pushed 4mo ago), licensed MIT. It adds 667 tokens to every session, about $0.0033 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.

Planning

codex AGENTS.md

AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.

openai/codex · 5,182 tokens

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 6,785 tokens

claude-plugin-external CLAUDE.md