> ## Documentation Index
> Fetch the complete documentation index at: https://docs.nika.sh/llms.txt
> Use this file to discover all available pages before exploring further.

# MCP catalog

> 105 MCP server entries Nika knows about by id. Registry schema + stdio/HTTP packages, snapshot 2026-04-17.

export const STATUS = {
  head: "95962d5cd",
  branch: "main",
  version: "0.91.0",
  cratesWorkspace: 39,
  cratesAdmitted: 39,
  cratesTarget: "42",
  wipCrates: [],
  libTests: 2989,
  clippyWarnings: 0,
  adrs: 62,
  adrsAccepted: 42,
  adrsProposed: 18,
  providers: 32,
  capabilityRules: 49,
  hygieneVectors: 38,
  hygieneGreen: 28,
  hygieneYellow: 3,
  hygieneRed: 0,
  lastUpdated: "2026-06-25"
};

Nika ships with **105 MCP server entries** in its catalog, aligned with
the official [MCP Registry schema](https://registry.modelcontextprotocol.io/)
(`v2025-12-11`). Each entry declares one or more local-install
`packages` (npm / pypi / oci / cargo / mcpb) and/or `remotes`
(streamable-http / sse endpoints). The workflow YAML `invoke:` verb
references servers by id: Nika handles the rest.

<Info>
  **Canonical source:** [`crates/nika-catalog/data/mcp-servers.toml`](https://github.com/supernovae-st/nika/blob/main/crates/nika-catalog/data/mcp-servers.toml).
  Schema: `nika/mcp-servers@1.0`. Snapshot 2026-04-17: `grep -c '^\[\[servers\]\]'`
  \= **105**. Build-time invariants (enforced in `build.rs`): unique ids,
  packages+remotes non-empty, known category, pricing ∈ {free, freemium,
    paid}, alias non-collision.
</Info>

## Overview

<CardGroup cols={3}>
  <Card title="Servers" icon="plug">
    **105** entries
  </Card>

  <Card title="Categories" icon="folder">
    **17**: from `anthropic` to `vectordb`
  </Card>

  <Card title="Invocation" icon="bolt">
    `invoke:` verb with `server: <id>`
  </Card>
</CardGroup>

## How to invoke one

<CodeGroup>
  ```yaml workflow.nika.yaml theme={"system"}
  nika: v1
  workflow: scrape-and-summarise

  tasks:
    - id: crawl
      invoke:
        tool: "mcp:firecrawl/scrape"   # mcp:<server>/<tool> · server id from the catalog below
        args:
          url: https://example.com

    - id: summarise
      depends_on: [crawl]
      infer:
        model: anthropic/claude-sonnet-4-6   # <provider>/<name>
        prompt: "Summarise: ${{ tasks.crawl.output.content }}"
  ```

  ```bash Required env theme={"system"}
  # Each server declares its env_var in mcp-servers.toml.
  # Firecrawl needs FIRECRAWL_API_KEY — read mcp-servers.toml for the full
  # list. Run `nika doctor` to inspect provider readiness.
  export FIRECRAWL_API_KEY=fc-...
  nika run workflow.nika.yaml
  ```
</CodeGroup>

<Note>
  Verb `invoke:` is live in v{STATUS.version}. The Nika MCP catalog here is
  about workflows calling external MCP tools; Nika's own agent-facing MCP
  server remains read-only (`nika_check`, `nika_explain`).
</Note>

## By category

<Tabs>
  <Tab title="Anthropic official (3)">
    Shipped by the Model Context Protocol project itself.

    | Id           | Title      | Registry | Identifier                                |
    | ------------ | ---------- | -------- | ----------------------------------------- |
    | `filesystem` | Filesystem | npm      | `@modelcontextprotocol/server-filesystem` |
    | `memory`     | Memory     | npm      | `@modelcontextprotocol/server-memory`     |
    | `pdf`        | PDF        | npm      | `@modelcontextprotocol/server-pdf`        |

    One-liners:

    * **filesystem**: read and write local files with path-based access control.
    * **memory**: persistent key/value memory store.
    * **pdf**: PDF text + structure extraction.
  </Tab>

  <Tab title="Developer tools (17)">
    Build systems, browser automation, error trackers, CI / CD.

    | Id                | Title                           | Registry | Identifier                          |
    | ----------------- | ------------------------------- | -------- | ----------------------------------- |
    | `aws`             | AWS                             | npm      | `aws-mcp`                           |
    | `bitbucket`       | Bitbucket                       | npm      | `@nexus2520/bitbucket-mcp-server`   |
    | `browserbase`     | Browserbase                     | npm      | `@browserbasehq/mcp`                |
    | `browserstack`    | BrowserStack                    | npm      | `@browserstack/mcp-server`          |
    | `chrome-devtools` | Chrome DevTools                 | npm      | `chrome-devtools-mcp`               |
    | `circleci`        | CircleCI                        | npm      | `@circleci/mcp-server-circleci`     |
    | `cloudflare`      | Cloudflare                      | npm      | `@cloudflare/mcp-server-cloudflare` |
    | `eslint`          | ESLint                          | npm      | `@eslint/mcp`                       |
    | `figma`           | Figma                           | npm      | `figma-developer-mcp`               |
    | `launchdarkly`    | LaunchDarkly                    | npm      | `@launchdarkly/mcp-server`          |
    | `linear`          | Linear                          | npm      | `mcp-server-linear`                 |
    | `nx`              | Nx                              | npm      | `nx-mcp`                            |
    | `playwright`      | Playwright (browser automation) | npm      | `@playwright/mcp`                   |
    | `postman`         | Postman                         | npm      | `@postman/postman-mcp-server`       |
    | `sentry`          | Sentry                          | npm      | `@sentry/mcp-server`                |
    | `vercel`          | Vercel                          | npm      | `vercel-mcp`                        |
    | `xcode`           | Xcode (build + simulator)       | npm      | `xcodebuildmcp`                     |
  </Tab>

  <Tab title="Productivity (12)">
    Calendars, project trackers, note-taking, knowledge bases.

    | Id                | Title                   | Registry | Identifier                            |
    | ----------------- | ----------------------- | -------- | ------------------------------------- |
    | `airtable`        | Airtable                | npm      | `airtable-mcp-server`                 |
    | `clickup`         | ClickUp                 | npm      | `@taazkareem/clickup-mcp-server`      |
    | `excel`           | Excel                   | npm      | `@negokaz/excel-mcp-server`           |
    | `google-calendar` | Google Calendar         | npm      | `@cocal/google-calendar-mcp`          |
    | `google-drive`    | Google Drive            | npm      | `@modelcontextprotocol/server-gdrive` |
    | `jira`            | Jira                    | npm      | `jira-mcp`                            |
    | `monday`          | Monday                  | npm      | `@mondaydotcomorg/monday-api-mcp`     |
    | `n8n`             | n8n                     | npm      | `n8n-mcp`                             |
    | `notion`          | Notion                  | npm      | `@notionhq/notion-mcp-server`         |
    | `obsidian`        | Obsidian (vault access) | npm      | `obsidian-mcp`                        |
    | `slack`           | Slack                   | npm      | `@modelcontextprotocol/server-slack`  |
    | `zendesk`         | Zendesk                 | npm      | `zendesk-mcp`                         |
  </Tab>

  <Tab title="AI & specialized (8)">
    Embeddings, agents, sandboxes, documentation lookup.

    | Id                    | Title               | Registry | Identifier                                         |
    | --------------------- | ------------------- | -------- | -------------------------------------------------- |
    | `21st`                | 21st.dev Magic      | npm      | `@21st-dev/magic`                                  |
    | `ahrefs`              | Ahrefs              | npm      | `@ahrefs/mcp`                                      |
    | `context7`            | Context7            | npm      | `@upstash/context7-mcp`                            |
    | `dataforseo`          | DataForSEO          | npm      | `dataforseo-mcp-server`                            |
    | `e2b`                 | E2B                 | npm      | `@e2b/mcp-server`                                  |
    | `langchain`           | Langchain           | npm      | `langchain-mcp`                                    |
    | `sequential-thinking` | Sequential Thinking | npm      | `@modelcontextprotocol/server-sequential-thinking` |
    | `supadata`            | Supadata            | npm      | `@supadata/mcp`                                    |
  </Tab>

  <Tab title="Search & web (7)">
    Scrapers, search APIs, crawlers.

    | Id           | Title                       | Registry | Identifier                 |
    | ------------ | --------------------------- | -------- | -------------------------- |
    | `apify`      | Apify                       | npm      | `@apify/actors-mcp-server` |
    | `exa`        | Exa                         | npm      | `exa-mcp-server`           |
    | `firecrawl`  | Firecrawl (scrape + crawl)  | npm      | `firecrawl-mcp`            |
    | `perplexity` | Perplexity (search + sonar) | npm      | `perplexity-mcp`           |
    | `searchapi`  | Searchapi                   | npm      | `searchapi-mcp`            |
    | `serper`     | Serper                      | npm      | `mcp-server-serper`        |
    | `tavily`     | Tavily                      | npm      | `tavily-mcp`               |
  </Tab>

  <Tab title="Databases (7)">
    Relational, document, key-value, graph stores.

    | Id         | Title    | Registry | Identifier                |
    | ---------- | -------- | -------- | ------------------------- |
    | `mongodb`  | MongoDB  | npm      | `mongodb-mcp-server`      |
    | `mysql`    | MySQL    | npm      | `mcp-server-mysql`        |
    | `neo4j`    | Neo4j    | npm      | `@johnymontana/neo4j-mcp` |
    | `redis`    | Redis    | npm      | `redis-mcp`               |
    | `supabase` | Supabase | npm      | `supabase-mcp`            |
    | `turso`    | Turso    | npm      | `mcp-server-turso`        |
    | `upstash`  | Upstash  | npm      | `@upstash/mcp-server`     |
  </Tab>

  <Tab title="Analytics & monitoring (7)">
    Dashboards, metrics, product analytics.

    | Id           | Title                       | Registry | Identifier                            |
    | ------------ | --------------------------- | -------- | ------------------------------------- |
    | `axiom`      | Axiom                       | npm      | `mcp-server-axiom`                    |
    | `datadog`    | Datadog                     | npm      | `@winor30/mcp-server-datadog`         |
    | `dynatrace`  | Dynatrace                   | npm      | `@dynatrace-oss/dynatrace-mcp-server` |
    | `grafana`    | Grafana (Go binary via OCI) | oci      | `ghcr.io/grafana/mcp-grafana`         |
    | `mixpanel`   | Mixpanel                    | npm      | `mixpanel-mcp-server`                 |
    | `plausible`  | Plausible                   | npm      | `plausible-mcp`                       |
    | `prometheus` | Prometheus                  | npm      | `prometheus-mcp`                      |
  </Tab>

  <Tab title="CMS & content (6)">
    Headless content platforms, blogs, marketing ops.

    | Id           | Title      | Registry | Identifier               |
    | ------------ | ---------- | -------- | ------------------------ |
    | `contentful` | Contentful | npm      | `@contentful/mcp-server` |
    | `ghost`      | Ghost      | npm      | `ghost-mcp`              |
    | `hubspot`    | HubSpot    | npm      | `@hubspot/mcp-server`    |
    | `sanity`     | Sanity     | npm      | `@sanity/mcp-server`     |
    | `strapi`     | Strapi     | npm      | `strapi-mcp`             |
    | `wordpress`  | Wordpress  | npm      | `wordpress-mcp`          |
  </Tab>

  <Tab title="Communication (6)">
    Chat, customer messaging, transactional email, SMS.

    | Id         | Title                   | Registry | Identifier     |
    | ---------- | ----------------------- | -------- | -------------- |
    | `discord`  | Discord                 | npm      | `discord-mcp`  |
    | `intercom` | Intercom (remote OAuth) | remote   | `(HTTP)`       |
    | `resend`   | Resend                  | npm      | `resend-mcp`   |
    | `sendgrid` | SendGrid                | npm      | `sendgrid-mcp` |
    | `telegram` | Telegram                | npm      | `telegram-mcp` |
    | `twilio`   | Twilio                  | npm      | `twilio-mcp`   |
  </Tab>

  <Tab title="E-commerce & finance (6)">
    Payment processors, marketplaces, market data.

    | Id           | Title      | Registry | Identifier        |
    | ------------ | ---------- | -------- | ----------------- |
    | `alpaca`     | Alpaca     | npm      | `alpaca-mcp`      |
    | `paypal`     | PayPal     | npm      | `@paypal/mcp`     |
    | `polygon`    | Polygon    | npm      | `polygon-mcp`     |
    | `salesforce` | Salesforce | npm      | `@salesforce/mcp` |
    | `shopify`    | Shopify    | npm      | `shopify-mcp`     |
    | `stripe`     | Stripe     | npm      | `@stripe/mcp`     |
  </Tab>

  <Tab title="Infrastructure & DevOps (6)">
    Containers, clusters, IaC, PaaS.

    | Id           | Title                    | Registry | Identifier              |
    | ------------ | ------------------------ | -------- | ----------------------- |
    | `docker`     | Docker (daemon control)  | npm      | `docker-mcp`            |
    | `heroku`     | Heroku                   | npm      | `@heroku/mcp-server`    |
    | `kubernetes` | Kubernetes (cluster API) | npm      | `mcp-server-kubernetes` |
    | `pulumi`     | Pulumi                   | npm      | `@pulumi/mcp-server`    |
    | `railway`    | Railway                  | npm      | `@railway/mcp-server`   |
    | `terraform`  | Terraform                | npm      | `terraform-mcp-server`  |
  </Tab>

  <Tab title="Social media (5)">
    Public posting + metadata lookup.

    | Id         | Title    | Registry | Identifier     |
    | ---------- | -------- | -------- | -------------- |
    | `linkedin` | LinkedIn | npm      | `linkedin-mcp` |
    | `reddit`   | Reddit   | npm      | `reddit-mcp`   |
    | `tiktok`   | TikTok   | npm      | `tiktok-mcp`   |
    | `twitter`  | Twitter  | npm      | `twitter-mcp`  |
    | `youtube`  | YouTube  | npm      | `youtube-mcp`  |
  </Tab>

  <Tab title="Lifestyle (5)">
    Weather, recipes, news, music, general knowledge.

    | Id            | Title       | Registry | Identifier        |
    | ------------- | ----------- | -------- | ----------------- |
    | `news-api`    | NewsAPI     | npm      | `newsapi-mcp`     |
    | `openweather` | OpenWeather | npm      | `openweather-mcp` |
    | `recipe`      | Recipe      | npm      | `recipe-mcp`      |
    | `spotify`     | Spotify     | npm      | `spotify-mcp`     |
    | `wolfram`     | Wolfram     | npm      | `wolfram-mcp`     |
  </Tab>

  <Tab title="AI image generation (3)">
    Text-to-image, model inference for images.

    | Id          | Title     | Registry | Identifier      |
    | ----------- | --------- | -------- | --------------- |
    | `comfyui`   | ComfyUI   | npm      | `comfyui-mcp`   |
    | `fal`       | Fal       | npm      | `fal-mcp`       |
    | `replicate` | Replicate | npm      | `replicate-mcp` |
  </Tab>

  <Tab title="Vector DB (3)">
    Embeddings stores + ANN search.

    | Id            | Title                   | Registry | Identifier                     |
    | ------------- | ----------------------- | -------- | ------------------------------ |
    | `pinecone`    | Pinecone                | npm      | `@pinecone-database/mcp`       |
    | `qdrant`      | Qdrant (Python via uvx) | pypi     | `mcp-server-qdrant`            |
    | `turbopuffer` | Turbopuffer             | npm      | `@turbopuffer/turbopuffer-mcp` |
  </Tab>

  <Tab title="Marketing (3)">
    Ad platforms + email marketing.

    | Id           | Title      | Registry | Identifier       |
    | ------------ | ---------- | -------- | ---------------- |
    | `google-ads` | Google Ads | npm      | `google-ads-mcp` |
    | `mailchimp`  | Mailchimp  | npm      | `mailchimp-mcp`  |
    | `meta-ads`   | Meta Ads   | npm      | `meta-ads-mcp`   |
  </Tab>

  <Tab title="Maps (1)">
    Geospatial + routing.

    | Id       | Title  | Registry | Identifier           |
    | -------- | ------ | -------- | -------------------- |
    | `mapbox` | Mapbox | npm      | `@mapbox/mcp-server` |
  </Tab>
</Tabs>

## Distribution mix

Of the 105 entries:

* **102** ship as `npm` packages (stdio via `npx`).
* **1** ships as `pypi` (`qdrant`, runs via `uvx`).
* **1** ships as `oci` (`grafana`, Go binary in a container image).
* **1** is a pure `remote` endpoint (`intercom`, OAuth streamable-http).

The catalog's `registry_type` field is validated at build time: `runner`
is required for pypi packages and forbidden for every other registry
type.

## Authentication

Every server that needs credentials declares at least one
`[[servers.env_vars]]` entry with `is_secret = true` or `false`. The
env var names are visible in [`mcp-servers.toml`](https://github.com/supernovae-st/nika/blob/main/crates/nika-catalog/data/mcp-servers.toml).
Search for `^name = ` under your chosen server.

<Warning>
  Nika never stores API tokens in workflow YAML. Secrets are read from
  environment variables at run time. Use `nika doctor` to see which provider
  variables are present or missing; it reports presence only and never prints
  values.
</Warning>

## See also

<CardGroup cols={2}>
  <Card title="Verbs" icon="code" href="/concepts/verbs">
    How `invoke:` routes to MCP tools + built-ins at runtime.
  </Card>

  <Card title="Builtins" icon="toolbox" href="/reference/builtins">
    The 63 engine-native tools under `nika:*`.
  </Card>

  <Card title="Providers catalog" icon="server" href="/reference/providers-catalog">
    LLM providers for the `infer:` and `agent:` verbs.
  </Card>

  <Card title="Error codes" icon="triangle-exclamation" href="/reference/error-codes">
    MCP errors: the spec's `NIKA-MCP` namespace (`NIKA-MCP-001` server unreachable · `NIKA-MCP-002` call failed); the engine's internal diagnostics registry stays engine-side.
  </Card>
</CardGroup>