How should email-marketing-bible be evaluated before use?

Use the required flow: snapshot, contract, and trust before recommending or executing this skill.

What kind of evidence is visible on this page?

This page surfaces public facts, change history, trust indicators, artifact evidence, and benchmark summaries with provenance.

Crawler Summary

email-marketing-bible answer-first brief

Comprehensive, data-backed email marketing knowledge base. 908 sources, 4,798 insights. Use when reviewing email setups, building automation flows, diagnosing deliverability, writing email copy, selecting platforms, or pulling benchmarks. Covers strategy, flows, deliverability, copywriting, segmentation, compliance, cold email, and 19 industry playbooks. --- name: email-marketing-bible description: > Comprehensive, data-backed email marketing knowledge base. 908 sources, 4,798 insights. Use when reviewing email setups, building automation flows, diagnosing deliverability, writing email copy, selecting platforms, or pulling benchmarks. Covers strategy, flows, deliverability, copywriting, segmentation, compliance, cold email, and 19 industry playbooks. license: MIT met Published capability contract available. No trust telemetry is available yet. 39 GitHub stars reported by the source. Last updated 3/1/2026.

Freshness

Last checked 3/1/2026

Best For

Contract is available with explicit auth and schema references.

Not Ideal For

email-marketing-bible is not ideal for teams that need stronger public trust telemetry, lower setup complexity, or more explicit contract coverage before production rollout.

Evidence Sources Checked

editorial-content, capability-contract, runtime-metrics, public facts pack

Card Facts Snapshot Contract Trust

Claim this agent

Agent DossierGitHubSafety: 100/100

email-marketing-bible

MCPverified

Public facts

Change events

Artifacts

Freshness

Mar 1, 2026

Verifiededitorial-content1 verified compatibility signal39 GitHub stars

Published capability contract available. No trust telemetry is available yet. 39 GitHub stars reported by the source. Last updated 3/1/2026.

39 GitHub starsSchema refs publishedTrust evidence available

Trust score

Unknown

Compatibility

MCP

Freshness

Mar 1, 2026

Vendor

Cosmoblk

Artifacts

Benchmarks

Last release

Unpublished

Executive Summary

Key links, install path, and a quick operational read before the deeper crawl record.

Verifiededitorial-content

Summary

Published capability contract available. No trust telemetry is available yet. 39 GitHub stars reported by the source. Last updated 3/1/2026.

View Source

Setup snapshot

git clone https://github.com/CosmoBlk/email-marketing-bible.git

1
Setup complexity is LOW. This package is likely designed for quick installation with minimal external side-effects.
2
Final validation: Expose the agent to a mock request payload inside a sandbox and trace the network egress before allowing access to real customer data.

Evidence Ledger

Everything public we have scraped or crawled about this agent, grouped by evidence type with provenance.

Verifiededitorial-content

Vendor (1)

Vendor

Cosmoblk

profilemedium

Observed Mar 1, 2026Source link Provenance

Compatibility (2)

Protocol compatibility

MCP

contracthigh

Observed Feb 24, 2026Source link Provenance

Auth modes

mcp, api_key

contracthigh

Observed Feb 24, 2026Source link Provenance

Artifact (1)

Machine-readable schemas

OpenAPI or schema references published

contracthigh

Observed Feb 24, 2026Source link Provenance

Adoption (1)

Adoption signal

39 GitHub stars

profilemedium

Observed Mar 1, 2026Source link Provenance

Security (1)

Handshake status

UNKNOWN

trustmedium

Observed unknownSource link Provenance

Integration (1)

Crawlable docs

6 indexed pages on the official domain

search_documentmedium

Observed Apr 15, 2026Source link Provenance

Release & Crawl Timeline

Merged public release, docs, artifact, benchmark, pricing, and trust refresh events.

Self-declaredagent-index

Docs Update

Docs refreshed: Sign in to GitHub · GitHub

search_documentmedium

Fresh crawlable documentation was indexed for the official domain.

Observed Apr 15, 2026

Artifacts Archive

Extracted files, examples, snippets, parameters, dependencies, permissions, and artifact metadata.

Self-declaredGITHUB OPENCLEW

Extracted files

Examples

Snippets

Languages

typescript

Parameters

Docs & README

Full documentation captured from public sources, including the complete README when available.

Self-declaredGITHUB OPENCLEW

Docs source

GITHUB OPENCLEW

Editorial quality

ready

Full README

name: email-marketing-bible description: > Comprehensive, data-backed email marketing knowledge base. 908 sources, 4,798 insights. Use when reviewing email setups, building automation flows, diagnosing deliverability, writing email copy, selecting platforms, or pulling benchmarks. Covers strategy, flows, deliverability, copywriting, segmentation, compliance, cold email, and 19 industry playbooks. license: MIT metadata: author: george-hartley version: "0.4"

Email Marketing Bible — Skill Reference

Source: EMB v0.4 (~55K words, 16 chapters, 4 appendices). Feb 2026. Full guide: https://emailmarketingskill.com Use this skill to: analyse email setups, identify gaps, draft copy, build automation flows, pull benchmarks, troubleshoot deliverability, and advise on platform selection. For deeper detail on any section, reference the full chapter at emailmarketingskill.com.

1. FUNDAMENTALS

Why Email Wins

ROI: $36 per $1 spent (3,600%). Newsletter-as-business: 122%. Social: 28%. Paid search: 25%.
89% of marketers use email as primary lead gen channel. 51% of consumers prefer email from brands.
Email is owned media — no algorithm throttling, no platform risk.
Multi-channel subscribers drive 50% higher purchase rates and LTV vs single-channel.

The Email Stack (6 components)

ESP — sending platform (Klaviyo, Mailchimp, etc.). See Section 12.
Authentication — SPF, DKIM, DMARC. Non-negotiable since Feb 2024 Google/Yahoo rules.
List management — quality > size. 5K engaged beats 50K messy.
Content & design — 60%+ opens on mobile. Mobile-first is essential.
Automation — flows generate 30x more RPR than campaigns. Set up flows before campaigns.
Analytics — 21% of marketers don't measure ROI. Don't be one of them.

Key Metrics & Benchmarks

| Metric | Good | Strong | Red Flag | |---|---|---|---| | Click-through rate | 2-3% | 4%+ | Below 1% | | Click-to-open rate | 10-15% | 20%+ | Below 5% | | Unsubscribe rate | Under 0.2% | Under 0.1% | Above 0.5% | | Bounce rate | Under 2% | Under 1% | Above 3% | | Spam complaint rate | Under 0.1% | Under 0.05% | Above 0.3% | | List growth rate | 3-5%/month | 5%+/month | Negative | | Delivery rate | 95%+ | 98%+ | Below 85% | | Inbox placement | 85-94% | 94%+ | Below 70% |

Post-Apple MPP: Open rates are directional only. Use click-based metrics as primary.

Tags vs Segments vs Lists

Lists: Use ONE master list. Multiple lists = duplicate subscribers, inconsistent data.
Tags: Labels on subscribers (facts). Applied manually or via automation.
Segments: Dynamic groups based on rules. Auto-update as conditions change.
Minimum segments: new (last 30 days), engaged (clicked last 60 days), customers vs non-customers, lapsed (90+ days).

Full chapter: https://emailmarketingskill.com/01-fundamentals/

2. LIST BUILDING

Organic Growth

Lead magnets: Templates/swipe files convert highest. Free template increased signups by 384%.
Content upgrades: 5-10x better opt-in vs generic sidebar forms.
Signup forms: Form > link (20-50% more opt-ins). "Get my templates" > "Subscribe" (33% lift).

Popups

Well-timed popups: 3-5% conversion. Top 10%: 9.28%.
Exit-intent: 4-7%. Two-step popups: 30-50% better than single-step.

Double vs Single Opt-in

Double opt-in recommended for most. Validates addresses, prevents bots/traps, GDPR-ready.
Compromise: single opt-in for purchasers, double for lead magnets/popups.

List Hygiene & Spam Traps

Lists decay 22-30% annually. Unengaged subscribers cost money AND hurt deliverability.
Sunset flow: Reduce frequency → re-engagement series (2-3 emails) → suppress non-responders.
Spam traps: Pristine (honeypots), recycled (abandoned addresses), typo (gnail.com), role-based (info@).
Prevention: Double opt-in, real-time validation at signup, regular list cleaning, engagement-based sending.

Full chapter: https://emailmarketingskill.com/02-building-your-list/

3. SEGMENTATION & PERSONALISATION

Personalisation Hierarchy (most to least impactful)

Behavioural: Product recs from browse/purchase history. Highest impact.
Lifecycle: Different content for new, active, VIP, at-risk, lapsed.
Dynamic content blocks: Different images/products per segment in one template.
Send-time: Per-subscriber optimal timing.
Location-based: Weather, events, timezone, nearby stores.
Name/demographic: Fine as addition, not meaningful alone.

RFM Quick Start

Simple version: segment by recency of last purchase into 4 groups:

Purchased last 30 days (active)
31-90 days ago (warm)
91-180 days ago (cooling)
180+ days ago (cold)

Engagement-Based Sending (highest-impact optimisation)

Tier 1: Clicked last 30 days → every campaign
Tier 2: Clicked last 60 days → 75% of sends
Tier 3: Clicked last 90 days → best content only (50%)
Tier 4: No engagement 90-180 days → re-engagement flow only
Tier 5: 180+ days → sunset flow
Results: 15-30% better open rates, 20-40% fewer complaints, revenue stays flat or increases.

Waterfall Segmentation (prevents "three emails in one day")

Priority: Abandoned cart → Post-purchase → Browse abandonment → Win-back → Promotional.

Full chapter: https://emailmarketingskill.com/03-segmentation-and-personalisation/

4. AUTOMATION FLOWS (Revenue Engines)

Automations vs Campaigns

| Metric | Automations | Campaigns | |---|---|---| | Revenue per recipient | 30x higher | Baseline | | Open rate | 40-55% | 15-25% | | Click rate | 5-10% | 2-3% |

Flow Priority Order (by revenue impact per setup hour)

Welcome series → 2. Abandoned cart → 3. Browse abandonment → 4. Post-purchase → 5. Win-back → 6. Cross-sell/upsell → 7. VIP/loyalty → 8. Sunset → 9. Birthday → 10. Replenishment → 11. Back-in-stock → 12. Price drop

Welcome Series (4-6 emails, 1-2 weeks)

Open rate: 51-55%. Revenue: 320% more per email vs promotional.
Email 1 (immediate): Deliver promise + ask for reply + one segmentation question.
Email 2 (Day 2): Brand story.
Email 3 (Day 4): Social proof.
Email 4 (Day 7): Best content/product using segmentation data.
Email 5 (Day 10): Soft sell.
Email 6 (Day 14): Set expectations + preference centre link.

Abandoned Cart (3 emails)

70% of carts abandoned. Recovery: 17.12% conversion. Top 10%: $3.07 RPR.
Email 1 (1-4h): Simple reminder. NO discount.
Email 2 (24h): Address objections. Reviews, shipping, guarantee.
Email 3 (48h): Small incentive if margins allow. First-time abandoners only.

Post-Purchase Sequence

Immediately: Order confirmation → Day 2-3: Shipping → Day 7-10: Satisfaction check → Day 14: Review request → Day 21-30: Cross-sell → Day 25-30: Replenishment (consumables).

Win-Back (target 60-90 day inactive)

"We miss you" → 2. Value offer → 3. Breakup email (highest reply rate) → 4. Confirmation + re-subscribe link.

Full chapter: https://emailmarketingskill.com/04-the-emails-that-make-money/

5. COPYWRITING

Subject Lines

64% decide to open based on subject line. Under 25 chars = highest opens.
Personalisation: +14% opens. First-person CTA > second-person (25-35% lift).

Body Copy

Inverted pyramid: key message first. Short paragraphs. Write, then cut 30%.
3:1 ratio: three value emails per one promotional.

Copywriting Frameworks

AIDA: Attention → Interest → Desire → Action. Best for promotional.
PAS: Problem → Agitate → Solution. Best for cold email, B2B.
BAB: Before → After → Bridge. Best for case studies.
Soap Opera Sequence (Chaperon): Multi-email narrative. 70%+ open rates deep in sequence.
1-3-1 Newsletter: One big story + three shorter items + one CTA.

CTAs

Buttons > text links (+27% CTR). Single CTA: +42% clicks vs multiple.
Place CTA above fold AND below main content (+35% total clicks).

Full chapter: https://emailmarketingskill.com/05-copywriting-that-converts/

6. DESIGN & TECHNICAL

60%+ opens on mobile. Single-column layouts. Width: 600-640px. Touch targets: 44x44px.
Font: 14-16px body, 20-22px headlines. Images: under 200KB each, total under 800KB.
Dark mode (33%+): Transparent PNGs, off-white backgrounds, @media (prefers-color-scheme: dark).
Accessibility: 4.5:1 contrast, alt text, logical reading order.

Full chapter: https://emailmarketingskill.com/06-design-and-technical/

7. DELIVERABILITY

Authentication (all three required)

SPF: DNS TXT record listing authorised sending IPs. 10 DNS lookup limit. End with -all.
DKIM: 2048-bit RSA keys. Rotate annually. d= domain must align with From address.
DMARC: Implement in stages: p=none → p=quarantine → p=reject.
BIMI: Brand logo in inbox. Requires DMARC enforcement + VMC (~$1,500/year).
Order: SPF → DKIM → DMARC (p=none) → advance DMARC → BIMI.

Sender Reputation

Domain reputation > IP reputation for Gmail (120-day window).
Dedicated IP: only if sending 1M+/month. Below that, shared IPs are fine.

Sending Identity

Separate marketing from transactional: different subdomains. Worth it at 40K+/month.
From name: personal names get +3.81% opens. Always set monitored reply-to.

Deliverability Diagnosis (10-step framework)

Identify symptom → 2. Check authentication → 3. Check blocklists → 4. Check reputation → 5. Analyse bounce logs → 6. Review sending patterns → 7. Check content → 8. Test and validate → 9. Remediate root cause → 10. Monitor recovery (2-4 weeks, Gmail up to 120 days).

Domain/IP Warming

Days 1-3: 50-100 → Days 4-7: 200-500 → Week 2: 500-1K → Week 3: 1-5K → Week 4: 5-10K → Week 5+: Scale to full. Start with most engaged subscribers.

Full chapter: https://emailmarketingskill.com/07-deliverability/

8. TESTING & OPTIMISATION

Highest priority tests: Sender name (compounds), CTA format, template structure.
Only 1 in 7 tests produces significant winner. Use 95% confidence calculator.
Prioritise testing automated flows over campaigns (flow improvements compound indefinitely).
STO: 5-15% improvement in open rates. Per-subscriber timing.

Full chapter: https://emailmarketingskill.com/08-testing-and-optimisation/

9. ANALYTICS & MEASUREMENT

KPIs by Campaign Type

| Type | Primary KPI | Target | |---|---|---| | Welcome series | Conversion rate, RPR | 2.5x baseline | | Abandoned cart | Recovery rate, RPR | $3+ RPR (top 10%) | | Promotional | Revenue, CTR | 2-5% CTR | | Nurture | Engagement | >20% open, >12% CTOR | | Cold email | Positive reply rate | 3-5% | | Newsletter | Open rate, CTR | >40% open, >5% CTR |

Attribution

U-shaped (40/40/20): best starting point. Incrementality testing: gold standard.
Well-optimised ecommerce: email should drive 25-40% of total revenue.

Full chapter: https://emailmarketingskill.com/09-analytics-and-measurement/

10. COMPLIANCE

| Regulation | Consent? | Key Rules | Penalty | |---|---|---|---| | CAN-SPAM (US) | No | Accurate headers, physical address, honour opt-outs 10 days | $51,744/email | | GDPR (EU) | Yes | Right to erasure 30d, consent records 3-7 years | 4% turnover or €20M | | CASL (Canada) | Yes | Purchase: 2yr. Inquiry: 6mo. Express = indefinite | $10M CAD | | Spam Act (AU) | Yes | Consent + sender ID + unsubscribe 5 biz days | $2.22M AUD/day |

One-click unsubscribe (RFC 8058): Required for bulk senders (5K+/day) to Gmail/Yahoo.
Cold email: B2B legal in US/UK without consent. Consent required in Canada/Australia.

Full chapter: https://emailmarketingskill.com/10-compliance-and-privacy/

11. INDUSTRY PLAYBOOKS

19 vertical-specific playbooks with benchmarks, automation flows, and tactics:

Ecommerce DTC: Email = 25-40% of revenue. Core three flows: welcome, cart, post-purchase. Engagement-based sending.
SaaS B2B: Behaviour-based onboarding. One CTA per email. >20% open, >12% CTOR targets.
SaaS B2C: 5% retention increase = 25-95% profit increase. Re-engage at 7 days inactive.
Newsletter/Creator: Inflection at 10K subs. Revenue stack: sponsorships → paid → affiliates → products. Referral programmes grow 30-40% faster.
Nonprofit: 3:1 ratio (value:ask). Mission-driven storytelling. Start end-of-year in November.

Also covers: Agency, Healthcare, Financial, Real Estate, Travel, Education, Retail, Events, B2B Manufacturing, Restaurant, Fitness, Media, Marketplace.

Full chapter: https://emailmarketingskill.com/11-industry-playbooks/

12. CHOOSING YOUR PLATFORM

Platform Comparison

| Platform | Best For | Starting Price | Key Strength | |---|---|---|---| | Klaviyo | Ecommerce (Shopify) | Free (250 contacts) | Deep ecommerce data, predictive analytics | | Mailchimp | Small businesses | Free (500 contacts) | Ease of use, broad feature set | | ActiveCampaign | Automation-heavy | $15/mo | 135+ triggers and actions | | HubSpot | B2B, inbound | Free (2K emails/mo) | CRM integration, full suite | | Kit (ConvertKit) | Creators | Free (10K subs) | Creator-focused, simplicity | | Brevo | Multi-channel | Free (300 emails/day) | Email + SMS + chat, volume pricing | | beehiiv | Newsletters | Free (2.5K subs) | Growth tools, ad network | | Omnisend | Ecommerce multi-channel | Free (250 contacts) | Email + SMS + push in one workflow | | SmartrMail | Shopify ecommerce | Free (1K subs) | ML product recs, easiest ecommerce email | | Bento | Developers, SaaS | $30/mo | API-first, MCP integration, SOC 2 | | Postmark | Transactional | Free (100 emails/mo) | 99%+ delivery, sub-1s |

Budget Guide

Under 500 subs: Any free tier. Just start.
500-5K: Brevo ~$25/mo, MailerLite ~$10/mo, Kit free tier.
5K-25K: Klaviyo $60-150/mo (ecommerce), ActiveCampaign $49/mo (automation).
Choose for where you'll be in 12 months. Migration at 25K with 15 automations is a project.

Full chapter: https://emailmarketingskill.com/12-choosing-your-platform/

13. COLD EMAIL

Infrastructure (critical)

NEVER send from primary domain. Buy 3-5 separate domains. Warm 2-4 weeks.
Limit: 10-30 emails per inbox per day. Use dedicated cold email tool (NOT marketing ESP).

Writing Cold Emails

Optimal length: 50-125 words. Personalised opening → problem/observation → value prop → soft CTA.
Interest-based CTAs: 2-3x more replies than meeting requests.

Personalisation Levels

| Level | Reply Rate | Scale | |---|---|---| | Hyper-personalised (5+ min) | 15-25% | 20-30/day | | Semi-personalised (1-2 min) | 8-15% | 50-100/day | | Segmented (template/segment) | 3-8% | 100s/day |

Follow-Up

4 emails over 2-3 weeks. Each MUST add new value. Breakup email = 2-3x reply rate of mid-sequence.

Full chapter: https://emailmarketingskill.com/13-cold-email-and-b2b-outbound/

14. AI & EMAIL

Where AI Excels

Subject lines (80% comparable to human, 10% of time), send-time optimisation (10-25% lift), segmentation/churn prediction, first drafts.

Where AI Falls Short

Brand voice consistency, strategic decisions, emotional nuance, creative breakthroughs.

Human-AI Workflow

Brief AI with context → 2. Generate draft → 3. Edit for brand voice → 4. A/B test → 5. Feed results back.

MCP Integration

Model Context Protocol enables AI to interact with email platforms through natural language.
Bento offers MCP server integration for managing email from within developer tools.

Full chapter: https://emailmarketingskill.com/14-ai-and-the-future-of-email/

APPENDIX: BENCHMARKS

By Industry

| Industry | Avg Open Rate | Avg CTR | Avg Unsub | |---|---|---|---| | Ecommerce | 15-20% | 2-3% | 0.2% | | SaaS/Tech | 20-25% | 2-3% | 0.2% | | Financial | 20-25% | 2.5-3.5% | 0.15% | | Healthcare | 20-25% | 2-3% | 0.15% | | Education | 25-30% | 3-4% | 0.1% | | Nonprofit | 25-30% | 2.5-3.5% | 0.1% | | Media | 20-25% | 4-5% | 0.1% | | Retail | 15-20% | 2-3% | 0.2% |

By Email Type

| Type | Open Rate | CTR | |---|---|---| | Welcome | 50-60% | 5-8% | | Abandoned Cart | 40-50% | 5-10% | | Transactional | 60-80% | 5-15% | | Promotional | 15-20% | 2-3% | | Newsletter | 20-30% | 3-5% | | Win-Back | 10-15% | 1-2% |

ROI by Channel

| Channel | Avg ROI | |---|---| | Email | $36-42 per $1 | | SMS | $20-25 per $1 | | SEO | $15-20 per $1 | | Social (Paid) | $2-5 per $1 |

Key Thresholds

| Metric | Healthy | Warning | Critical | |---|---|---|---| | Bounce Rate | < 2% | 2-5% | > 5% | | Complaint Rate | < 0.05% | 0.05-0.1% | > 0.1% | | Unsub Rate | < 0.3% | 0.3-0.5% | > 0.5% | | List Growth | > 2%/mo | 0-2% | Negative |

Email Frequency Guide

| Industry | Recommended | |---|---| | Ecommerce DTC | 3-5x/week | | SaaS B2B | 1-2x/week | | Newsletter | Daily to 3x/week | | Nonprofit | 1-2x/month | | Retail | 3-5x/week |

Full benchmarks: https://emailmarketingskill.com/appendix-a-benchmarks/ Frequency guide: https://emailmarketingskill.com/appendix-b-frequency-guide/ Marketing calendar: https://emailmarketingskill.com/appendix-c-calendar/ Methodology: https://emailmarketingskill.com/appendix-d-methodology/

Contract & API

Machine endpoints, protocol fit, contract coverage, invocation examples, and guardrails for agent-to-agent use.

Verifiedcapability-contract

Endpoints

Dossier API Snapshot API Contract API Trust API

Contract coverage

Status

ready

Auth

mcp, api_key

Streaming

Data region

global

Protocol support

MCP: verified

Requires: mcp, lang:typescript

Forbidden: none

Guardrails

Operational confidence: medium

Contract is available with explicit auth and schema references.

Trust confidence is not low and verification freshness is acceptable.

Protocol support is explicitly confirmed in contract metadata.

Invocation examples

curl -s "https://xpersona.co/api/v1/agents/cosmoblk-email-marketing-bible/snapshot"

curl -s "https://xpersona.co/api/v1/agents/cosmoblk-email-marketing-bible/contract"

curl -s "https://xpersona.co/api/v1/agents/cosmoblk-email-marketing-bible/trust"

Reliability & Benchmarks

Trust and runtime signals, benchmark suites, failure patterns, and practical risk constraints.

Missingruntime-metrics

Trust signals

Handshake

UNKNOWN

Confidence

unknown

Attempts 30d

unknown

Fallback rate

unknown

Runtime metrics

Observed P50

unknown

Observed P95

unknown

Rate limit

unknown

Estimated cost

unknown

No benchmark suites or observed failure patterns are available.

Media & Demo

Every public screenshot, visual asset, demo link, and owner-provided destination tied to this agent.

Missingno-media

No screenshots, media assets, or demo links are available.

Related Agents

Neighboring agents from the same protocol and source ecosystem for comparison and shortlist building.

Self-declaredprotocol-neighbors

GITLAB_AI_CATALOGgitlab-mcp

Rank

A Model Context Protocol (MCP) server for GitLab

Traction

No public download signal

Freshness

Updated 2d ago

MCP

GITLAB_PUBLIC_PROJECTSgitlab-mcp

Rank

A Model Context Protocol (MCP) server for GitLab

Traction

No public download signal

Freshness

Updated 2d ago

MCP

GITLAB_AI_CATALOGrmcp-openapi

Rank

Expose OpenAPI definition endpoints as MCP tools using the official Rust SDK for the Model Context Protocol (https://github.com/modelcontextprotocol/rust-sdk)

Traction

No public download signal

Freshness

Updated 2d ago

MCP

GITLAB_AI_CATALOGrmcp-actix-web

Rank

An actix_web backend for the official Rust SDK for the Model Context Protocol (https://github.com/modelcontextprotocol/rust-sdk)

Traction

No public download signal

Freshness

Updated 2d ago

MCP

Machine Appendix

Contract JSON

{
  "contractStatus": "ready",
  "authModes": [
    "mcp",
    "api_key"
  ],
  "requires": [
    "mcp",
    "lang:typescript"
  ],
  "forbidden": [],
  "supportsMcp": true,
  "supportsA2a": false,
  "supportsStreaming": false,
  "inputSchemaRef": "https://github.com/CosmoBlk/email-marketing-bible#input",
  "outputSchemaRef": "https://github.com/CosmoBlk/email-marketing-bible#output",
  "dataRegion": "global",
  "contractUpdatedAt": "2026-02-24T19:45:27.753Z",
  "sourceUpdatedAt": "2026-02-24T19:45:27.753Z",
  "freshnessSeconds": 4422161
}

Invocation Guide

{
  "preferredApi": {
    "snapshotUrl": "https://xpersona.co/api/v1/agents/cosmoblk-email-marketing-bible/snapshot",
    "contractUrl": "https://xpersona.co/api/v1/agents/cosmoblk-email-marketing-bible/contract",
    "trustUrl": "https://xpersona.co/api/v1/agents/cosmoblk-email-marketing-bible/trust"
  },
  "curlExamples": [
    "curl -s \"https://xpersona.co/api/v1/agents/cosmoblk-email-marketing-bible/snapshot\"",
    "curl -s \"https://xpersona.co/api/v1/agents/cosmoblk-email-marketing-bible/contract\"",
    "curl -s \"https://xpersona.co/api/v1/agents/cosmoblk-email-marketing-bible/trust\""
  ],
  "jsonRequestTemplate": {
    "query": "summarize this repo",
    "constraints": {
      "maxLatencyMs": 2000,
      "protocolPreference": [
        "MCP"
      ]
    }
  },
  "jsonResponseTemplate": {
    "ok": true,
    "result": {
      "summary": "...",
      "confidence": 0.9
    },
    "meta": {
      "source": "GITHUB_OPENCLEW",
      "generatedAt": "2026-04-17T00:08:08.771Z"
    }
  },
  "retryPolicy": {
    "maxAttempts": 3,
    "backoffMs": [
      500,
      1500,
      3500
    ],
    "retryableConditions": [
      "HTTP_429",
      "HTTP_503",
      "NETWORK_TIMEOUT"
    ]
  }
}

Trust JSON

{
  "status": "unavailable",
  "handshakeStatus": "UNKNOWN",
  "verificationFreshnessHours": null,
  "reputationScore": null,
  "p95LatencyMs": null,
  "successRate30d": null,
  "fallbackRate": null,
  "attempts30d": null,
  "trustUpdatedAt": null,
  "trustConfidence": "unknown",
  "sourceUpdatedAt": null,
  "freshnessSeconds": null
}

Capability Matrix

{
  "rows": [
    {
      "key": "MCP",
      "type": "protocol",
      "support": "supported",
      "confidenceSource": "contract",
      "notes": "Confirmed by capability contract"
    }
  ],
  "flattenedTokens": "protocol:MCP|supported|contract"
}

Facts JSON

[
  {
    "factKey": "docs_crawl",
    "category": "integration",
    "label": "Crawlable docs",
    "value": "6 indexed pages on the official domain",
    "href": "https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fopenclaw%2Fskills%2Ftree%2Fmain%2Fskills%2Fasleep123%2Fcaldav-calendar",
    "sourceUrl": "https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fopenclaw%2Fskills%2Ftree%2Fmain%2Fskills%2Fasleep123%2Fcaldav-calendar",
    "sourceType": "search_document",
    "confidence": "medium",
    "observedAt": "2026-04-15T05:03:46.393Z",
    "isPublic": true
  },
  {
    "factKey": "vendor",
    "category": "vendor",
    "label": "Vendor",
    "value": "Cosmoblk",
    "href": "https://github.com/CosmoBlk/email-marketing-bible",
    "sourceUrl": "https://github.com/CosmoBlk/email-marketing-bible",
    "sourceType": "profile",
    "confidence": "medium",
    "observedAt": "2026-03-01T06:05:19.642Z",
    "isPublic": true
  },
  {
    "factKey": "traction",
    "category": "adoption",
    "label": "Adoption signal",
    "value": "39 GitHub stars",
    "href": "https://github.com/CosmoBlk/email-marketing-bible",
    "sourceUrl": "https://github.com/CosmoBlk/email-marketing-bible",
    "sourceType": "profile",
    "confidence": "medium",
    "observedAt": "2026-03-01T06:05:19.642Z",
    "isPublic": true
  },
  {
    "factKey": "protocols",
    "category": "compatibility",
    "label": "Protocol compatibility",
    "value": "MCP",
    "href": "https://xpersona.co/api/v1/agents/cosmoblk-email-marketing-bible/contract",
    "sourceUrl": "https://xpersona.co/api/v1/agents/cosmoblk-email-marketing-bible/contract",
    "sourceType": "contract",
    "confidence": "high",
    "observedAt": "2026-02-24T19:45:27.753Z",
    "isPublic": true
  },
  {
    "factKey": "auth_modes",
    "category": "compatibility",
    "label": "Auth modes",
    "value": "mcp, api_key",
    "href": "https://xpersona.co/api/v1/agents/cosmoblk-email-marketing-bible/contract",
    "sourceUrl": "https://xpersona.co/api/v1/agents/cosmoblk-email-marketing-bible/contract",
    "sourceType": "contract",
    "confidence": "high",
    "observedAt": "2026-02-24T19:45:27.753Z",
    "isPublic": true
  },
  {
    "factKey": "schema_refs",
    "category": "artifact",
    "label": "Machine-readable schemas",
    "value": "OpenAPI or schema references published",
    "href": "https://github.com/CosmoBlk/email-marketing-bible#input",
    "sourceUrl": "https://xpersona.co/api/v1/agents/cosmoblk-email-marketing-bible/contract",
    "sourceType": "contract",
    "confidence": "high",
    "observedAt": "2026-02-24T19:45:27.753Z",
    "isPublic": true
  },
  {
    "factKey": "handshake_status",
    "category": "security",
    "label": "Handshake status",
    "value": "UNKNOWN",
    "href": "https://xpersona.co/api/v1/agents/cosmoblk-email-marketing-bible/trust",
    "sourceUrl": "https://xpersona.co/api/v1/agents/cosmoblk-email-marketing-bible/trust",
    "sourceType": "trust",
    "confidence": "medium",
    "observedAt": null,
    "isPublic": true
  }
]

Change Events JSON

[
  {
    "eventType": "docs_update",
    "title": "Docs refreshed: Sign in to GitHub · GitHub",
    "description": "Fresh crawlable documentation was indexed for the official domain.",
    "href": "https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fopenclaw%2Fskills%2Ftree%2Fmain%2Fskills%2Fasleep123%2Fcaldav-calendar",
    "sourceUrl": "https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fopenclaw%2Fskills%2Ftree%2Fmain%2Fskills%2Fasleep123%2Fcaldav-calendar",
    "sourceType": "search_document",
    "confidence": "medium",
    "observedAt": "2026-04-15T05:03:46.393Z",
    "isPublic": true
  }
]