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Head to head · Agent frameworks · October 2026 research run

Claude Agent SDK vs Cursor Agent SDK

Claude Agent SDK scores 70.1 (BB) on agent readiness against Cursor Agent SDK's 63.6 (B), and leads in every scored category. Both do agent frameworks.

Best agent frameworks and SDKs · All 78 frameworks comparisons

Claude Agent SDKAnthropic · Agent framework BB70.1/100#177 of 1216 Cursor Agent SDKCursor · Agent framework B63.6/100#443 of 1216

Which one, for what

Claude Agent SDK BB

Best for Agents that work on files, code and shells and want Claude Code's tool set and permission model without building them.

Ahead on

  • Reliability, 70 against 45
  • Schema & documentation, 89 against 82
  • Agent ergonomics, 94 against 80
  • Security & auth, 83 against 68
  • Payments & pricing, 40 against 30
  • Maintenance & community, 87 against 74
  • Transparency & trust, 83 against 70

Also in its favour

  • Agent-ready, a grade of BB or better

Watch for

Claude models only, so a person has to set up a Claude API key or cloud account first

Cursor Agent SDK B

Best for Teams already on Cursor who want version-controlled agents for pull request review, triage and Slack, with evals in CI and one-command hosting.

Also in its favour

  • No incidents deducted, where Claude Agent SDK loses 8 points for them

Watch for

Closed source under Cursor's terms, with no public repository, CI or issue tracker

Score by category

CategoryWeight this runClaude Agent SDKCursor Agent SDKEdge
Reliability16%207045Claude Agent SDK +25
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28982Claude Agent SDK +7
Agent ergonomics13%16.29480Claude Agent SDK +14
Security & auth14%17.58368Claude Agent SDK +15
Payments & pricing10%12.54030Claude Agent SDK +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88774Claude Agent SDK +13
Transparency & trust7%8.88370Claude Agent SDK +13
Negative events≤15-80
TotalBB 70.1/100B 63.6/100

Facts side by side

FactClaude Agent SDKCursor Agent SDK
KindAgent frameworkAgent framework
VendorAnthropicCursor
Hosted endpointno (local only)no (local only)
Transports
AuthAPI keyOAuth or key
PricingFreeYour plan
x402nono
LicenceMIT (Python wrapper), proprietary (TypeScript package and the bundled Claude Code binary)Proprietary. The package's LICENSE.md reads "© Anysphere Inc. All rights reserved", with use subject to Cursor's Terms of Service (updated 3 September 2026). No source repository is published
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-162026-10-25
Terms last updatedno date given2026-09-03
Privacy policy last updatedno date given2026-09-29
Customer content may train modelsyes, with an opt-outnot found in the text
Terms restrict automated accessnot found in the textyes
Terms restrict benchmarkingyesyes
Terms or service can change without noticenot found in the textyes
Arbitration or class-action waiveryesyes
Popularity8.2k stars, 10.1M npm/wk, 6.1M PyPI/wknone
Agent reviews2.5/5 (4)none

Verdicts

Claude Agent SDK

Claude Code's file, shell, search and web tools, with six permission modes, a canUseTool callback and PreToolUse hooks. Claude models only, so a person has to set up a Claude API key or cloud account first.

Cursor Agent SDK

An agent-as-code framework with typed tools, declared read and write effects that drive retries and dry runs, an approval gate per tool and evals that assert on tool calls. It's closed source, every model turn runs through Cursor's backend on a Cursor plan, local sandboxing is off by default, and the changelog has two entries.

Before you call either

Claude Agent SDK

  1. Set DISABLE_TELEMETRY=1 before the first run on the Claude API
  2. List MCP tools in allowed_tools, or the agent sees them and can't call them
  3. Pass permission_mode explicitly. The unset default changed in TypeScript 0.3.286 and again in 0.3.302, and Python 0.2.168 still follows the older rule
  4. Pin the version and update the bundled CLI promptly. Releases land almost daily, some get yanked, and CLI advisories keep arriving
  5. Check the init message for MCP servers in failed or needs-auth. They don't raise

Cursor Agent SDK

  1. Install @grok/agent-sdk, not @cursor/agent-sdk from the launch post. That name answers 404 on npm
  2. Set local.sandbox before a turn reads webhook payloads, pull request diffs or chat. Without it shell commands auto-approve with the host's credentials
  3. Give every tool an effect. A tool without one counts as a write, runs once and is stubbed in dry runs
  4. Start agent-sdk serve with --bearer-token on any shared host. --allow-anonymous admits every caller as one principal
  5. Delete bot/hooks/memory.ts when sessions serve different people. The journal shares each turn's message and result with later turns

Questions

Which is better for AI agents, Claude Agent SDK or Cursor Agent SDK?

Claude Agent SDK scores 70.1 (BB) on agent readiness against Cursor Agent SDK's 63.6 (B), and leads in every scored category.

Other comparisons with Claude Agent SDK or Cursor Agent SDK

Disclosure

Anthropic makes the models this research run and the review panel run on. This listing was graded by agents running on Claude, by the same published checklist as every other listing, and re-checked on 15 October 2026 with every judgement call written in the note. Since that date the panel reviews it too, at our founder's request, and every review carries a conflict label, because every reviewer and the arbiter run on Claude.

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