capsulemcp

A Model Context Protocol server for Capsule CRM. Connect Claude (Desktop, Code, or web Projects via Custom Connector) to your CRM and let it answer natural-language questions across the full record graph: contacts, organisations, opportunities, projects, tasks, and timeline activity. Beyond the basics it covers structured filters with field/operator conditions, saved searches with sort, workflow tracks (templates and instances), file attachments (read + write), audit of deleted records, and batch fetches up to 50 records per call.

• 89 tools across the Capsule resource graph (50 in read-only mode) — full read coverage plus careful, confirm-gated writes; 6 batched-write tools (batch_*) for mass-update workflows
• Two transports: stdio for local installs (Claude Desktop / Code), HTTP+OAuth for hosted Custom Connectors
• Read-only mode as a one-env-var flag; works alongside read-scoped Capsule tokens
• MCP tool annotations: 50 read tools carry readOnlyHint: true, 8 destructive ones carry destructiveHint: true — clients that honor these hints can auto-approve safe reads while still prompting for writes/destructive calls
• Apache 2.0

Pick your install

| You want | Read this | |---|---| | Example questions to ask once the connector is running | EXAMPLES.md | | To use it locally with Claude Desktop or Claude Code | INSTALL.md | | To deploy it once and have your whole team use it via Claude.ai | DEPLOY.md | | To wire it into n8n workflows | INTEGRATIONS-n8n.md | | To contribute, debug, add a tool, or cut a release | HOWTO.md (procedures) · CONTRIBUTING.md (style & PR checks) | | To understand what's intentionally not implemented (and why) | DESIGN.md | | To see what performance work has been done (and what's next) | OPTIMIZATIONS.md | | To see ideas for features that might land in future versions | IDEAS.md | | To learn the surprising parts of Capsule's v2 API (with verbatim doc quotes) | NOTES-ON-CAPSULE-API.md |

For most individual users the install is a single JSON snippet pasted into Claude Desktop's config — see INSTALL.md.

Quick start (Claude Desktop)

1. Generate a Capsule API token: My Preferences → API Authentication Tokens → Generate, choose the Read scope for safety.

2. Add this to your claude_desktop_config.json (~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

   {
     "mcpServers": {
       "capsule": {
         "command": "npx",
         "args": ["-y", "capsulemcp"],
         "env": {
           "CAPSULE_API_TOKEN": "<paste token here>",
           "CAPSULE_MCP_READONLY": "1"
         }
       }
     }
   }

3. Restart Claude Desktop. The Capsule tools appear in the tool picker.

That's it. The first launch fetches the package from npm (a few seconds); subsequent launches are instant from the npx cache. To pin a specific version, use "[email protected]" in args. If you're tracking a fork or an unreleased branch, use the GitHub-ref form instead: "github:soil-dev/capsulemcp#v2.1.1" — same arguments, just installs from a git clone rather than the npm registry. See INSTALL.md for the Claude Code path, manual install, and troubleshooting.

Tools

| Group | Read | Write | |---|---|---| | Parties (people/orgs) | search_parties, filter_parties, get_party, get_parties, list_employees, list_party_opportunities, list_party_projects, list_party_entries | create_party, update_party, delete_party, add_party_email_address, remove_party_email_address_by_id, add_party_phone_number, remove_party_phone_number_by_id, add_party_address, remove_party_address_by_id, add_party_website, remove_party_website_by_id | | Opportunities | search_opportunities, filter_opportunities, get_opportunity, get_opportunities, list_opportunity_entries, list_associated_projects | create_opportunity, update_opportunity, delete_opportunity | | Projects | search_projects, list_projects, filter_projects, get_project, get_projects, list_project_entries | create_project, update_project, delete_project | | Additional parties (multi-party deals) | list_additional_parties | add_additional_party, remove_additional_party | | Tasks | list_tasks, get_task, get_tasks | create_task, update_task, complete_task, delete_task | | Entries (notes / captured emails) | get_entry, list_entries | add_note, update_entry, delete_entry | | Attachments (file upload / download) | get_attachment | upload_attachment | | Audit (deleted records) | list_deleted_parties, list_deleted_opportunities, list_deleted_projects | — | | Pipelines & milestones (opportunities) | list_pipelines, list_milestones | — | | Boards & stages (projects) | list_boards, list_stages | — | | Tracks (workflow instances) | list_track_definitions, list_entity_tracks, get_track | apply_track, update_track, remove_track | | Saved filters | list_saved_filters, run_saved_filter | — | | Custom fields (schema) | list_custom_fields, get_custom_field | — | | Tags | list_tags | add_tag, remove_tag_by_id, delete_tag_definition | | Users & teams | list_users, get_current_user, list_teams | — | | Reference metadata | list_lost_reasons, list_activity_types, list_categories, list_goals, get_site | — |

Most record-list tools default perPage=25; reference-data tools default perPage=100 so small accounts usually fit in one response. All paginated tools cap perPage at 100 and return a nextPage cursor when more results exist. Many GET tools accept an embed parameter (e.g. tags,fields) — see Capsule's API docs for the full list per resource.

The filter_* tools wrap Capsule's structured filter endpoint (POST /<entity>/filters/results) and accept an array of {field, operator, value} conditions ANDed together. Capsule's API does not support ad-hoc sort, so for "most recent X" questions filter by a date condition (e.g. addedOn is within last 7) and pick the highest id from the result — Capsule's numeric IDs are monotonically incrementing.

If you want sortable queries, use saved filters instead. Create the filter once in Capsule's web UI (it lets you set conditions, columns, and orderBy), then call run_saved_filter with its id. Use list_saved_filters to discover what's available.

Read-only mode

Set CAPSULE_MCP_READONLY=1 to disable every write/delete tool at the MCP layer (none of create_*, update_*, complete_task, add_note, or delete_* are registered). Pair it with a Capsule token that has the Read scope for defence in depth — your token's scope is the hard ceiling regardless of the env var.

Delete safety

Every whole-record delete_* tool, plus remove_track and remove_additional_party, requires confirm: true in its arguments. Without it, the schema rejects the call before any HTTP is made. Tool descriptions tell Claude to read the entity first and confirm with the user before invoking. The combined design — read-scoped token, read-only mode flag, schema-level confirm gate — means destructive actions are deliberate, not accidental.

License

Apache License 2.0 — Copyright 2026 Anton Arapov.