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Tumblr API and MCP server

Tumblr's API has no method to reply to asks, and it takes a registered app, OAuth and code you write and host. Sign in to Tumblr once in your own Cloud Browser, and your AI agent does the work there for you. The same tools work over MCP for agents and as a REST API for scripts.

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Not affiliated with Tumblr.

Tumblr has no API for this. So we run one for you.

Tumblr's own API, a GitHub MCP server and Cotlet compared
What you need Tumblr's APIGitHub MCP serverCotlet
Replying to asks No Partly Yes, 15 tools
Acts as you, signed in 24/7 No No Yes, Cloud Browser
Fixed for you when Tumblr changes N/A No Yes, tested every 6h
Runs with your laptop off N/A No Yes, hosted

Checked Oct 17, 2026. Sources: Tumblr API v2 documentation · Tumblr API documentation source on GitHub · Tumblr Help: Queued posts · Zapier: Tumblr triggers and actions

Your own Cloud Browser, on 24/7. Sign in once. We keep it connected.

  1. 01Sign in to Tumblr in your own Cloud Browser

  2. 02Connect it for your agents

  3. 03Cotlet keeps it signed in and working

How do I connect Tumblr to Claude, ChatGPT or my code?

AI agents connect over MCP, scripts call the REST API. Both reach the same 15 tools with one API key.

For AI agents: MCP

Add Cotlet to your agent once. Tumblr and every other app you connect show up as its tools.

  • Claude
  • ChatGPT
  • OpenClaw
  • Hermes
  • GrokBot
  • Cursor
  • n8n
  • Any MCP client
  1. 1

    Add Cotlet to your agent

    Claude Code
    claude mcp add --transport http cotlet \
  https://cotlet.dev/mcp/v1 \
  --header "Authorization: Bearer $COTLET_API_KEY"
    Cursor
    {
  "mcpServers": {
    "cotlet": {
      "url": "https://cotlet.dev/mcp/v1",
      "headers": {
        "Authorization": "Bearer ${COTLET_API_KEY}"
      }
    }
  }
}
    Codex
    # ~/.codex/config.toml
[mcp_servers.cotlet]
url = "https://cotlet.dev/mcp/v1"
bearer_token_env_var = "COTLET_API_KEY"

    Paste the snippet for your client. The same server and key serve every app you connect, so you do this once.

For scripts: REST API

Every tool is an endpoint under /api/v1/tumblr with its own method and path, such as POST /api/v1/tumblr/posts, with the same API key. Our open-source repo has ready scripts to start from.

REST API docs

What can the Tumblr API and MCP server do?

15 tools on your own Tumblr account. Agents call them as operations of the MCP tools tumblr_read and tumblr_write; scripts call each one at its own REST endpoint, with the same inputs and answers.

API reference
Tumblr tools in Cotlet's MCP server and REST API
Tool What it does Access
list_blogs Blogs your Tumblr account can post to, with name, title and URL. read
get_blog Title, description and ask settings of one blog. read
list_posts Posts on a blog or under a tag, newest first. read
get_post One post with its full content, tags and trail. read
list_queue Posts waiting in the queue, in publishing order, with their Queue settings. read
list_drafts Drafts on a blog, newest first. read
list_asks Asks waiting in the blog inbox, oldest first. read
get_post_notes Likes, reblogs and replies on one post. read
create_post Publish a post, add it to the queue, schedule it or save a draft. writeasks first
edit_post Change the text, tags or state of a post, or move a draft into the queue. writeasks first
reblog_post Reblog a post to your blog now, into the queue or as a draft. writeasks first
answer_ask Answer an ask from the inbox, publicly on your blog or privately. writeasks first
delete_ask Remove an ask from the inbox without answering it. writeasks first
delete_post Delete one of your posts, from the queue, drafts or the blog. writeasks first
follow_blog Follow a blog from your account. writeasks first

Scroll the table for all 15 tools.

Ask in plain words. Your agent does the rest.

All Tumblr use cases

Is it safe to connect Tumblr?

You sign in yourself in your own Cloud Browser, we never save your password, and anything that reaches your readers waits for your OK. The browser profile is encrypted in the EU. Independent scanners grade cotlet.dev A+.

Security overview

How much do the Tumblr API and MCP server cost?

One price for both: a tool call costs the same over MCP or REST. Free 7-day trial with 2,000 credits, no card needed. Then one-time credit packs, no subscription, valid 12 months. Most calls use 25 credits, and your Cloud Browser uses 50 credits a day while Tumblr is enabled for agents, so 20 calls a day come to 550 credits.

See full pricing
Cotlet credit packs: price, credits and calls at 25 credits each
Credits Price, one time Calls at 25 credits Per 1,000 credits
5,000 $29 200 $5.80
15,000 $79 600 $5.27
32,000 $149 1,280 $4.66
60,000 $249 2,400 $4.15

Only successful calls use credits; failed calls and timeouts cost nothing. At a balance of 0 calls pause, never a surprise charge. Authenticate with the Authorization: Bearer header.

Questions

Does Tumblr have an API?

Tumblr has a full public API v2 with OAuth for posts, queue, drafts, submissions, follows and notes, but no official MCP server (checked 17 Oct 2026). You register an app to get a key, and each app key is capped at 1,000 calls an hour and 5,000 a day.

How do I get access?

Sign up free, open Tumblr under Integrations in the console and press Request access. Your free trial starts with your account, no card needed.

Is the MCP server different from the API?

No, only the way in. Cotlet builds each integration as a REST API and puts an MCP server on top, so both have the same 15 tools, the same inputs and answers, one API key and one price. AI agents such as Claude, ChatGPT or Cursor use MCP; scripts, cron jobs and HTTP steps in n8n, Make or Zapier use the REST API.

What is the Cloud Browser?

Your own Chrome that Cotlet runs for you in the EU, around the clock. You open it from the console, sign in to Tumblr yourself and press Enable for agents. Your agent's calls go through it, from its IP with its cookies, so Tumblr sees the browser you signed in with. Password saving is off and the profile is stored encrypted with AES-256-GCM.

Can my agent act without asking me?

Not on anything that reaches other people: create_post, edit_post, reblog_post, answer_ask, delete_ask, delete_post, follow_blog wait for your OK by default. You can switch that off per tool for scheduled runs.

Does the queue limit apply to my agent?

Yes. Tumblr holds at most 1,000 queued posts and publishes at most 50 queued posts a day, so your agent queues up to that and reports when the queue is full.

Should I use a Tumblr MCP server from GitHub instead?

Pick one if you want the code on your own computer and do not mind the upkeep: you install it, sign it in and fix it when Tumblr changes. Pick Cotlet if you want it hosted and kept working for you.

Can I use it in n8n, Make or Zapier?

Yes. Add https://cotlet.dev/mcp/v1 in n8n's MCP Client node, or call the REST endpoints from an HTTP step in Make or Zapier.

Who runs Cotlet?

Cotlet is run by Take Group, a Polish software company working since 2019. Take Group runs about 3,200 websites on its own systems and has its own DevOps team for infrastructure security. We built and used integrations like this inside the company for years before opening them as Cotlet.

Is Cotlet affiliated with Tumblr?

No. Cotlet is independent and not affiliated with Tumblr.

Give your agent access to Tumblr.

Free 7-day trial with 2,000 credits, no card needed.

Sign up free