Rule MCP Server
A Model Context Protocol (MCP) server for the Rule marketing automation platform. It provides full access to Rule's REST API v2 for subscriber management, campaigns, transactional messages, and more.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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extend-marketing
Source: Glama
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Install from
The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.
These names and descriptions are the publisher's own, read from the source code. We print them as written. Our assessment is the findings above, not this list.
rule_create_subscribersCreate one or multiple subscribers in Rule. Can update existing subscribers if update_on_duplicate is true. Supports custom fields, tags, automation triggers, and opt-in flows.
rule_get_subscribersGet all subscribers with pagination support (max 100 per page).
rule_get_subscriberGet detailed information about a specific subscriber by email, phone number, or ID.
rule_get_subscriber_fieldsGet all custom field values for a specific subscriber organized by groups.
rule_update_subscriberUpdate subscriber information including email, phone, language, tags, and custom fields.
rule_delete_subscriberPermanently delete a subscriber from Rule.
rule_add_subscriber_tagsAdd one or more tags to a subscriber. Creates new tags if they don't exist. Triggers automation flows.
rule_get_subscriber_tagsGet all tags associated with a subscriber.
rule_clear_subscriber_tagsRemove all tags from a subscriber (does not delete tags or subscriber).
rule_delete_subscriber_tagRemove a specific tag from a subscriber (does not delete tag or subscriber).
rule_get_tagsGet all tags with pagination support.
rule_get_tagGet detailed information about a specific tag, optionally with subscriber count.
rule_update_tagUpdate tag name or description.
rule_delete_tagPermanently delete a tag from Rule.
rule_clear_tagRemove all subscribers from a tag (does not delete tag or subscribers).
rule_get_segmentsGet all sync-at segments with pagination support.
rule_send_transactionSend transactional email or SMS. Emails require base64-encoded content. SMS charged at 0.40 SEK per message.
rule_get_templatesGet all available email templates.
rule_get_templateGet detailed information about a specific template including supported blocks.
rule_get_campaignsGet all campaigns with optional filtering by type, creation date, and send date.
rule_create_campaignCreate a new campaign (draft) with recipients, content, and optional template.
rule_get_campaignGet detailed information about a specific campaign including recipients.
rule_get_campaign_statisticsGet campaign statistics including sends, opens, clicks, bounces, and unsubscribes.
rule_send_campaignSend a campaign immediately. SMS campaigns cost 0.40 SEK per message.
rule_schedule_campaignSchedule a campaign to be sent at a specific date/time.
rule_delete_campaignPermanently delete a campaign.
rule_create_groups_and_fieldsCreate new custom field groups and fields for subscriber data.
rule_get_groupsGet all custom field groups with their fields.
rule_get_groupGet a specific custom field group with all its fields.
rule_get_suppressionsGet all suppressions (bounces, spam complaints, unsubscribes) with pagination.
rule_get_preference_groupsGet all preference groups with their available preferences.
rule_get_subscriber_preferencesGet a subscriber's preferences for a specific preference group.
rule_update_subscriber_preferencesUpdate a subscriber's opt-in/opt-out status for preferences in a group.
rule_get_journeysGet all journeys (automation flows) with optional filtering by name or preference.
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
axios Vulnerable to Full Man-in-the-Middle via Prototype Pollution Gadget in `config.proxy`
axios Vulnerable to Credential Theft and Response Hijacking via Prototype Pollution Gadget in Config Merge
Axios: Header Injection via Prototype Pollution
Allocation of Resources Without Limits or Throttling in Axios
Axios: Regular Expression Denial of Service (ReDoS) via Cookie Name Injection
PORTTool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
34/34 tools missing one or more hints — rule_create_subscribers (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); rule_get_subscribers (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); rule_get_subscriber (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +31 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Tests exist
No test files found
Add tests that exercise each declared tool.
Production dependencies are patched
0 critical, 10 high severity in production deps — axios@1.13.6 (high), axios@1.13.6 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
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