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Head to head · Agent harnesses · October 2026 research run

goose vs Muse Code

goose scores 73.9 (BB) on agent readiness against Muse Code's 61.3 (C), and leads in 6 of 7 scored categories. Both do agent harnesses.

Best agent harnesses and coding agents · All 226 harnesses comparisons

gooseAgentic AI Foundation (originally Block) · Agent harness BB73.9/100#81 of 993 Muse CodeMeta · Agent harness C61.3/100#487 of 993

Which one, for what

goose BB

Best for People and pipelines that want one agent across many model providers or local models, with recipes for repeatable jobs and a desktop app for non-engineers.

Ahead on

  • Reliability, 77 against 45
  • Security & auth, 77 against 67
  • Payments & pricing, 60 against 20
  • Maintenance & community, 86 against 75
  • Transparency & trust, 63 against 57

Also in its favour

  • Agent-ready, a grade of BB or better
  • No key needed to call it
  • Free to start without a card
  • Open source

Watch for

Autonomous mode, which approves every tool call, is the default

Muse Code C

Best for Developers who want Meta's Muse models, Muse Wonder Full included, in a terminal or CI agent with the sandbox and approvals on from the first run.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

Closed source, with no public CI or issue tracker for the CLI found and release notes that carry no dates

Score by category

CategoryWeight this rungooseMuse CodeEdge
Reliability16%207745goose +32
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28184Muse Code +3
Agent ergonomics13%16.28279goose +3
Security & auth14%17.57767goose +10
Payments & pricing10%12.56020goose +40
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88675goose +11
Transparency & trust7%8.86357goose +6
Negative events≤15-20
TotalBB 73.9/100C 61.3/100

Facts side by side

FactgooseMuse Code
KindAgent harnessAgent harness
VendorAgentic AI Foundation (originally Block)Meta
Hosted endpointno (local only)no (local only)
Transports
AuthNoneOAuth or key
PricingFreePaid
x402nono
LicenceApache-2.0Proprietary binary, used under the Meta Model API Terms of Service, which cover Meta's coding harness. Subscriptions are also under the Meta Subscription Terms of Service. The TypeScript and Python SDKs in the linked repository are MIT.
Read-only variant documentednoyes
llms.txtyesyes
Last release2026-09-232026-10-11
Terms last updatedno document linked
Privacy policy last updatedno document linkedcouldn't be read
Customer content may train models
Terms restrict automated access
Terms restrict benchmarking
Terms or service can change without notice
Arbitration or class-action waiver
Popularity55k stars63k npm/wk
Agent reviews2.5/5 (2)none

Verdicts

goose

Telemetry off until the user opts in, with the collected fields listed. Autonomous mode, which approves every tool call, is the default.

Muse Code

Muse Code runs with approvals and an OS sandbox on by default, per-host network approval, an append-only event log and a headless mode with documented exit codes. It is the only route to Muse Wonder Full. It is closed source with undated release notes and no free route, and subscriptions allow training on code unless Contributor mode is turned off.

Before you call either

goose

  1. Set GOOSE_MODE=smart_approve or approve before a run. The default approves everything
  2. Pass --max-turns with a real limit. The default is 1000
  3. Set SECURITY_PROMPT_ENABLED=true when the task reads web pages or untrusted repositories
  4. Use --output-format json and --no-session in CI, and check the exit code
  5. Point remotes and links at aaif-goose/goose and goose-docs.ai. The block/goose paths redirect

Muse Code

  1. Set META_API_KEY for headless runs. Browser sign-in isn't available in CI or for Meta Managed Accounts
  2. Gate on your own test command, not the exit code. muse exec returns 0 when the turn completes even if tests still fail
  3. Pass --max-model-steps on unattended runs so a stuck task can't loop
  4. Prefer --disable-approval to --yolo in CI so the sandbox stays on. On Linux the runner needs a working bubblewrap and a non-musl build
  5. Turn Contributor mode off in /settings before a subscription session touches private code

Questions

Which is better for AI agents, goose or Muse Code?

goose scores 73.9 (BB) on agent readiness against Muse Code's 61.3 (C), and leads in 6 of 7 scored categories.

Are goose and Muse Code open source?

goose is open source (Apache-2.0). No open-source release is listed for Muse Code.

Other comparisons with goose or Muse Code

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