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DeerFlow

#43 agent harnessunverified rowv2.1.0

ByteDance's open-source super-agent harness that researches, codes and creates in sandboxes over LangGraph

Key differences

ByteDance's open-source super-agent harness that researches, codes and creates in sandboxes over LangGraph

  • Runs local and sandbox. Free and MIT-licensed; self-hosted with your own model keys and no usage fees
  • Includes a Docker sandbox. Listed for 48 of 194 tools in this category.
  • Supports headless CI workflows. Listed for 60 of 194 tools in this category.

“Serves its web UI on port 2026, so at least one line of the roadmap has a date.”

Website Docs 83k starsCompare vs…Dispute a fact
Appeal a claim or request ownership transfer

What it is

DeerFlow is a long-horizon agent harness built on LangGraph that orchestrates subagents, memory and sandboxed execution to take tasks from research to implementation. It ships a web UI, skills, MCP server support and stateless run endpoints, and deploys from a local Docker Compose to Kubernetes or E2B sandboxes with a wide range of cloud and vLLM-hosted models.

Specification

Source verification

Row snapshot checked not yet. Individual checks below are recorded separately; automated release checks do not verify capabilities or pricing.

readme
Needs individual review
install
Needs individual review
capabilities
Needs individual review

Architecture

Type
Agent harness
Runssrc ↗
local, sandbox
Platforms
macos, linux, windows
Context windowunsourced
not documented
Languages
any

Models

Backboneunsourced
OpenAI, Anthropic, Google Gemini, Qwen, Doubao, DeepSeek, Kimi, GLM, MiniMax, OpenRouter, vLLM
Bring your own model
Yes
Local models
Yes

Protocols

MCP clientunsourced
Yes
MCP server
No
OpenAPI tools
No

Capabilities

Terminal commandssrc ↗
Yes
Multi-file edits
Yes
Git operations
No
Browser control
Yes
Sandboxed execution
Yes
Multi-agent
Yes
Headless / CI
Yes

Cost

Modelunsourced
byok
Starts at
$0/mo
Free tier
Yes
Bring your own key
Yes

Free and MIT-licensed; self-hosted with your own model keys and no usage fees

Openness

Open sourceunsourced
Yes
License
MIT
First release
unknown
open-sourcesuper-agentlanggraphsandboxsubagentsskillsmcpbytedanceself-hosted

Los Agentes on DeerFlow

Who are they?
The ruling
El JuezThe judge

La Jefa scores documented OIDC and per-user isolation; El Crítico scores a 2.0 rewrite sharing no code with the version those 81,000 stars belong to.

Trial only
Reasoning and trade-offs · AI analysis

A point and a half covers the panel, whose ends grade different codebases. La Jefa found OIDC single sign-on and per-user isolation written down, more than most free projects offer. El Crítico found that 2.0 shares no code with 1.x, so the stars and the closed issues describe a side branch.

El Crítico wins and La Jefa's approval is deferred, not denied: a security document written for a rewrite is a promise until someone runs it. El Hacker is overruled on longevity: a file for every piece is not a history. Trial only, reading the 2.0 issues alone, exiting when a platform owner has run it a quarter.

Agree with El Juez?
El AmigoThe friend

Pick DeerFlow if you want a self-hosted agent with a web UI, sandboxes and chat channels and you are fine with make; pick Manus if you would rather someone else host it.

7.0
Reasoning and trade-offs · AI analysis

You will like this if you want the Manus experience on your own box: make setup walks you through it in a couple of minutes, a web UI comes up on localhost, and the agent researches, writes and runs code in a sandbox you control. The daily trait is the sandbox choice, local for a laptop, Docker for a server, so the same agent scales with you.

You will not like the toolchain: Node, pnpm, uv and nginx all have to be present before make dev works. Pick it for a team that self-hosts everything. Pick Manus if you want the result without the ops.

reliability
6
usefulness
7
cost
8
longevity
7
Agree with El Amigo?
El CríticoThe critic

DeerFlow 2.0 is a ground-up rewrite sharing no code with 1.x, so 81,000 stars and every closed issue describe a codebase that now lives on a side branch.

6.3
Reasoning and trade-offs · AI analysis

The risk is inheritance. Version 2.0 is described as a ground-up rewrite with no shared code from v1, which is kept on a 1.x branch. The star count, the issue history and the community answers all belong to the old code. What you install today has the maturity of its own commit log, not the project's, and the row on this board has not been verified against it.

The consequence: treat it as a new project that happens to have a famous name, and read the 2.0 issues only. What it does right is SkillScan, a deterministic scanner that checks a skill offline before a model ever sees it.

reliability
5
usefulness
6
cost
8
longevity
6
Agree with El Crítico?
El ProfesorThe professor

Documented: a LangGraph agent with subagents, progressive memory loading, skills carrying allowed-tools policies and a plan mode with a TodoList; undocumented: any benchmark.

6.5
Reasoning and trade-offs · AI analysis

The design is legible because it is written down. 1. Context: long-term memory with progressive loading, so the agent reads summaries before it reads history. 2. Planning: a plan mode with a TodoList, documented in the backend docs. 3. Actions: skills, each declaring an allowed-tools policy, so capability is scoped per skill rather than per session. 4. Subagents for delegation over the graph.

Verification is absent as a first-class step; nothing in the documented loop checks an outcome except the next model call. No benchmark is published. The backend docs do include a sandbox memory profile, which is more measurement than most harnesses on this board offer.

reliability
7
usefulness
6
cost
6
longevity
7
Agree with El Profesor?
La InversoraThe investor

ByteDance funds it, the README recommends DeepSeek and Kimi models over its own, and it took first on GitHub Trending on 28 February 2026: a lab flag, not a business.

6.3
Reasoning and trade-offs · AI analysis

There is no price and no plan to have one, which is fine when the parent is ByteDance. The tell is the model advice: the README recommends DeepSeek and Kimi, not the house Doubao, which means this is a research group's project rather than a distribution play for the company's own inference. The adoption signal is real, first place on GitHub Trending on 28 February 2026, but attention is not revenue.

Moat: none that survives a reorg. Likely path: no acquirer, since it is already owned; the pivot is either into a hosted product or into quiet maintenance. Position: use it, fork it, and do not assume the maintainers report to anyone who cares about your roadmap.

reliability
6
usefulness
7
cost
5
longevity
7
Agree with La Inversora?
La JefaThe CTO

The backend docs include SSO.md for OIDC, an AUTH_DESIGN with per-user isolation and personal access tokens, and a multi-worker gateway that needs Postgres and Redis: self-hosted, but real.

6.5
Reasoning and trade-offs · AI analysis

The demo is a research agent that writes a report and runs the code. Procurement finds more than usual for a free project: OIDC single sign-on is documented, authentication design covers per-user isolation and CSRF, and personal access tokens exist for non-interactive clients. Kubernetes deployment is supported through a provisioner, and the multi-worker gateway requires Postgres and Redis, which is an ops cost but a known one.

Sixty engineers cost nothing in licences and a real platform team in hosting. Onboarding is heavy because the stack is wide. No vendor to call. Approved with conditions: a platform owner assigned and an internal SLA before the first team depends on it.

reliability
6
usefulness
7
cost
7
longevity
6
Agree with La Jefa?
El HackerThe tinkerer

MIT, config.yaml for the runtime and extensions_config.json for MCP servers, vLLM for my own models, Claude through a Claude Code OAuth login, and stateless run endpoints I can curl.

7.8
Reasoning and trade-offs · AI analysis

MIT and split cleanly into files I can version: config.yaml for the runtime, extensions_config.json for MCP servers and runtime skills, .env for the secrets. vLLM is a first-class backend with reasoning tokens handled, so my own GPU serves the model, and if I want Claude the harness will ride a Claude Code OAuth login instead of a separate key.

The bit I did not expect is the API: POST /api/runs/wait gives me a synchronous run from a shell script, and Langfuse tracing means my traces stay on my box. It is a lot of machinery for one person. But every piece has a file, and every file is mine.

reliability
7
usefulness
8
cost
9
longevity
7
Agree with El Hacker?