HTML Email Playbook
NPM · EMAIL-PLAYBOOK-MCP · 2 COMPONENTS
Teaches AI to write HTML email that renders in Outlook, Gmail, and Apple Mail. 21 rules, 6 comps.
Available components
Last scanned (5 hours ago)
Scores higher than 81% of npm servers
Category Developer Tools
How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. How we score → Why this is hard to score →
Supply Chain Security98
- No malware found by supply-chain analysis.Pass
- No known CVEs affecting this package version or its production dependencies.Pass
- No install/post-install scripts declared.Pass
- 30 of 92 dependencies flagged as unhealthy. View diagnostics → Partial
Provenance & Transparency45
- Source repository is publicly reachable at the declared URL. View diagnostics → Pass
- Provenance check failed: no build-provenance attestation is published. See how to fix → View diagnostics → Fail
- Clear OSI-approved license (MIT).Pass
- Actively maintained (last published 5 days ago).Pass
- Disclosure check failed: no security disclosure policy was found in the source repository. See how to fix → Fail
Schema Quality & AI Usability76
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 686 tokens (~137/item across 5 items; 5 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 3 Nov 26 0
- Stability: 0.97 → pass security
- 2 Nov 26 0
- Stability: pass → 0.97 functional
- 1 Nov 26 +15
- Malware scan: unverified → pass ▲ security
- 31 Oct 26 −15
- Malware scan: pass → unverified ▼ security
- Package version: 0.7.0 → 0.8.0 functional
- 27 Oct 26 0
- Stability: 0.97 → pass security
- 26 Oct 26 0
- Stability: pass → 0.97 functional
- 24 Oct 26 0
- Security disclosure: unverified → fail ▼ functional
- 22 Oct 26 0
- Security disclosure: fail → unverified ▼ functional
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Analysed npm/email-playbook-mcp@0.8.0
Provenance No attestation
The registry publishes no build provenance for this version, so there is nothing to verify.
| Result | No attestation |
|---|---|
| Ecosystem | npm |
Background: How many MCP packages publish verified provenance →
Dependencies 92 packages
| Packages resolved | 92 |
|---|---|
| Stale | 30 |
| Tree resolution | Complete |
Background: SBOMs and build attestations, explained →
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
get_component ~84
Return the full record for a single component: title, description, narrative body, the primary HTML pattern, list of slots (placeholders the model should fill), VML/responsive flags, and all code examples. Use after list_components to fetch the actual HTML pattern to paste into an email.
| Name | Type | Req | Description |
|---|---|---|---|
| name | string | yes | Component name. Get the list from list_components first. |
No output schema declared.
No examples provided.
get_playbook_rules ~164
Return rule pages. format "checklist": each page as its slug, title, description and a short list of the rules to follow, without the body or code; leave out category to get every page in one call (about 16 KB). format "full" (default, needs a category): each page with title, description, checklist, markdown body and all HTML/CSS code examples. Start with the checklists, then fetch the pages you need with get_rule. Components are not included: use list_components / get_component.
| Name | Type | Req | Description |
|---|---|---|---|
| category | string | – | Which rule category to fetch. Required for format "full"; optional for "checklist". |
| format | string | – | full (default): whole pages with code. checklist: titles and rules only. |
No output schema declared.
No examples provided.
get_rule ~149
Return one rule page: slug, category, title, description, checklist, and the markdown body, which includes the page's HTML/CSS code. Accepts the full slug (e.g. "compatibility/responsive"), just the page name ("responsive"), or a page link from a body ("/email-playbook/compatibility/responsive/"). Get the slugs from list_categories. Much smaller than fetching the whole category with get_playbook_rules.
| Name | Type | Req | Description |
|---|---|---|---|
| include_examples | boolean | – | Also return the code examples as a separate array (they are already in the body). Default false. |
| slug | string | yes | Page slug, e.g. "compatibility/responsive" or "responsive". |
No output schema declared.
No examples provided.
list_categories ~123
List all rule categories in the Email Playbook with a one-line description, page count, and the slug and title of each page in it. Categories are: structure (head/body container/header/body/footer), compatibility (Outlook MSO, RTL, responsive), production (Gmail clipping, dark mode, preheader, bulletproof buttons), ai-generation (constraints for AI emitters). Pass a page slug to get_rule to fetch just that page. For reusable components, use list_components instead — they live in a separate dimension and are not returned by get_playbook_rules.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
list_components ~60
List all reusable email components in the playbook with their metadata: name, subcategory (layout/media/interactive/text), description, whether they require Outlook VML, and whether they are responsive. Use this first to discover what components exist before calling get_component.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
How do I install the HTML Email Playbook MCP server?
HTML Email Playbook runs locally as an npm package, launched with npx -y email-playbook-mcp. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
npm · email-playbook-mcp
claude mcp add osamahassouna-email-playbook-mcp -- npx -y email-playbook-mcp
What is the HTML Email Playbook MCP server?
HTML Email Playbook is an MCP server listed in the public MCP registry as io.github.OsamaHassouna/email-playbook-mcp. Teaches AI to write HTML email that renders in Outlook, Gmail, and Apple Mail. 21 rules, 6 comps. This page covers its npm package (email-playbook-mcp).
Is the HTML Email Playbook MCP server safe to use?
HTML Email Playbook scores 84 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 5 November 2026. It declares no install or post-install scripts. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the HTML Email Playbook MCP server expose?
HTML Email Playbook exposes 5 tools: list_categories, get_playbook_rules, get_rule, list_components, get_component. Their descriptions and schemas cost roughly 580 tokens of context every time the server is loaded.
Is the HTML Email Playbook MCP server still maintained?
HTML Email Playbook is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.
What licence is the HTML Email Playbook MCP server under?
HTML Email Playbook declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.