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Why CLI-First?

SendyKit chose CLI over MCP for agent integration. Here’s why:
FactorCLIMCP Server
SetupZero — agents already have bashInstall server, configure transport
DebuggingVisible request/responseOpaque protocol layer
ComposabilityPipes, loops, jq, grepSingle tool calls
CompatibilityEvery agent with shell accessOnly MCP-compatible agents
MaintenanceNone — CLI is the productSeparate codebase to maintain
Agents with shell access (Claude Code, Pi, Letta, OpenCode, Cursor) can use SendyKit’s full power through the same CLI humans use.

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Example Agent Workflows

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”Add this lead to the onboarding drip"

sendykit subscribers add \
  --email lead@example.com \
  --name "Jane Smith" \
  --list onboarding \
  --brand 2

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"Show me the best performing campaign this month"

sendykit campaigns list \
  --brand 2 \
  --sort open_rate \
  --limit 1 \
  --json | jq '.data[0] | {subject, open_rate, click_rate, recipients}'

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"Create a re-engagement campaign for inactive subscribers"

# Find inactive subscribers (no opens in 90 days)
sendykit analytics engagement --brand 2 --tier ghost --json | jq '.data | length'

# Create the campaign
sendykit campaigns create \
  --brand 2 \
  --subject "We miss you! Here's 20% off" \
  --list inactive-90d \
  --template re-engage

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"Run a full health check and fix what you can"

sendykit doctor --auto-fix --json | jq '.results[] | select(.severity == "critical")'

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"What’s my deliverability looking like?”

sendykit analytics dashboard --brand 2 --json | \
  jq '{health_score, bounce_rate, complaint_rate, open_rate}'

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Skill File

For structured agent integration, add a SKILL.md to your agent’s skills directory: 
# SendyKit Email Management

Use SendyKit CLI for email marketing operations.

## Available Operations
- `sendykit brands list` — List all brands
- `sendykit subscribers add --email X --list Y` — Add subscriber
- `sendykit campaigns list --brand X --json` — List campaigns
- `sendykit campaigns create --brand X --subject "..." --list Y` — Create campaign
- `sendykit analytics dashboard --brand X --json` — Get analytics
- `sendykit doctor` — Run 68 health checks
- `sendykit plans show` — View current plan
- `sendykit health` — Quick health check

## All output supports --json for structured parsing

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Machine Payments

For agents without shell access, SendyKit’s machine-paid path is Stripe-native machine payments. Use X-Stripe-Machine-Payment proofs for premium actions.