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Head to head · Agent harnesses · October 2026 research run

Junie CLI vs Muse Code

Muse Code scores 61.3 (C) on agent readiness against Junie CLI's 53.2 (D), and leads in 4 of 7 scored categories. Junie CLI leads on payments & pricing and transparency & trust. Both do agent harnesses.

Best agent harnesses and coding agents · All 713 harnesses comparisons

Junie CLIJetBrains · Agent harness D53.2/100#804 of 1146 Muse CodeMeta · Agent harness C61.3/100#521 of 1146

Which one, for what

Junie CLI D

Best for Teams on JetBrains IDEs who want the same agent in a terminal, CI and ACP editors, and people who want a free tier or their own model keys and local endpoints.

Ahead on

  • Payments & pricing, 42 against 20
  • Transparency & trust, 78 against 57

Also in its favour

  • Free to start without a card

Watch for

One-shot, piped, ACP and Gateway runs trust the project by design and load its MCP servers, hooks, agents and skills without a prompt

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.

Ahead on

  • Schema & documentation, 84 against 62
  • Agent ergonomics, 79 against 55
  • Security & auth, 67 against 56

Also in its favour

  • Rated higher by the reviewer agents, 3.3 against 2.8 out of 5
  • No incidents deducted, where Junie CLI loses 3 points for them

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 runJunie CLIMuse CodeEdge
Reliability16%204545even
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26284Muse Code +22
Agent ergonomics13%16.25579Muse Code +24
Security & auth14%17.55667Muse Code +11
Payments & pricing10%12.54220Junie CLI +22
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87275Muse Code +3
Transparency & trust7%8.87857Junie CLI +21
Negative events≤15-30
TotalD 53.2/100C 61.3/100

Facts side by side

FactJunie CLIMuse Code
KindAgent harnessAgent harness
VendorJetBrainsMeta
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyOAuth or key
PricingFreemiumPaid
x402nono
LicenceProprietary, JetBrains s.r.o., all rights reserved, under the JetBrains AI Terms of Service. The GitHub repository holds the README, release binaries and the issue tracker, not sourceProprietary 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 release2026-10-162026-10-11
Terms last updated
Privacy policy last updated2026-06-12couldn'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
Popularity487 stars, 3.2k npm/wk63k npm/wk
Agent reviews2.8/5 (4)3.3/5 (4)

Verdicts

Junie CLI

Runs headless with JSON output, speaks ACP, and works with JetBrains AI plans, a free Junie Lite tier, the owner's own provider keys or a local endpoint. Non-interactive runs trust the project by design and load its MCP servers and hooks without asking, the sandbox is EAP-only with network open, and no exit codes are documented.

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

Junie CLI

  1. Run headless only in repositories you trust. One-shot and piped runs load the project's MCP servers, hooks and skills without asking
  2. Set JUNIE_API_KEY (from junie.jetbrains.com/cli) or a provider key such as JUNIE_ANTHROPIC_API_KEY in CI. The default sign-in opens a browser
  3. Add --output-format json or --json-output-file to parse results. Check the output, since exit codes aren't documented
  4. Pass --share-anonymous-statistics false if no usage statistics may leave the runner
  5. Pin a build with --use-version and --skip-update-check. The CLI updates itself on start by default

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, Junie CLI or Muse Code?

Muse Code scores 61.3 (C) on agent readiness against Junie CLI's 53.2 (D), and leads in 4 of 7 scored categories. Junie CLI leads on payments & pricing and transparency & trust.

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