HarnessMatch

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Pair programmer

Crush

Terminal-native, multi-model coding with LSP, MCP, and a read-only task agent.

Status
Active
License
FSL-1.1-MIT
Evidence
Documented + code-verifiable, 20 sources
Product record checked
2026-07-27
Compare harnessesInspect sources

At a glance

A source-available terminal coding agent for interactive or scripted work, with multi-provider and local-model support, a Hyper subscription option, mid-session model switching, project sessions, LSP, MCP, skills, hooks, per-tool approvals, and parallel read-only research delegation.

Good choice if

  • Terminal-first developers who want a polished interactive UI plus a non-interactive run command
  • People choosing between Hyper subscription access, API providers, and local models
  • Projects that benefit from LSP, MCP, skills, and a parallel read-only research agent

Check before choosing

  • The built-in task agent delegates parallel read-only search, not independent write-capable implementation
  • No first-party execution sandbox, browser automation, or file checkpoint mechanism was found
  • PreToolUse hooks cover top-level tool calls but do not intercept tools used inside the task agent
See 1 more considerations
  • Project configuration is trusted code and can execute shell expansion at startup; host approvals can also be bypassed with --yolo

Capability support

Documented first-class product support, checked against the sources below.

External tools (MCP)
DocumentedProduct-supported MCP integrationSource · checked 2026-07-27The source establishes the mechanism, not its quality or availability in every mode.
Reusable skills
DocumentedProduct-supported reusable skill packagesSource · checked 2026-07-27Support does not establish portability, package quality, safety, or adoption.
Local models
DocumentedLocal or self-hosted model pathSource · checked 2026-07-27The source establishes the mechanism, not its quality or availability in every mode.
Agent parallelism
DocumentedDelegated or parallel agent workflowSource · checked 2026-07-27The source establishes the mechanism, not its quality or availability in every mode.
Runs without an open UI
DocumentedNon-interactive or automation surfaceSource · checked 2026-07-27The source establishes the mechanism, not its quality or availability in every mode.
Browser control
Not documentedNo first-class support established by the current recordAbsence of current documentation is not proof that the capability is impossible.
Isolated execution
Not documentedNo first-class support established by the current recordAbsence of current documentation is not proof that the capability is impossible.
Undo file changes
Not documentedNo first-class support established by the current recordAbsence of current documentation is not proof that the capability is impossible.

Getting started

Install Crush, choose Hyper, an API provider, or a local model, review any project `crush.json` before opening the repository, then configure LSP, MCP, skills, and permissions. Use `crush run` for non-interactive work.

Open official documentation

Classification and operating model

Category fit and technical mechanisms are evidence records, not product-quality scores.

Category fit
Qualifies, 4/4 criteria
Operating model
7/7 layers documented
Inspect category criteria and operating mechanismsFirst-party records

Why it qualifies as a coding harness

This confirms category fit, not product quality. Every required criterion links back to first-party evidence.

Qualifies4 of 4 required criteria evidenced

  • Adaptive agent loop

    Documented

    The system repeatedly observes results and chooses the next action instead of following a fixed one-pass graph.

    EvidencePinned Crush overview

  • Repository tool execution

    Documented

    The system can use tools to inspect and change a repository or its execution environment.

    EvidencePinned agent tests

  • Task-aware context management

    Documented

    The runtime assembles, updates, compacts, retrieves, or persists task-relevant context while work proceeds.

    EvidencePinned session store

  • Model-independent runtime control

    Documented

    Permissions, budgets, interruption, policy, or stop controls operate outside the model's own text generation.

    EvidencePinned permission manager

Membership establishes category fit only. It does not score quality, safety, autonomy, model capability, or benchmark performance. · Read the membership rule.

How it works under the hood

Seven mechanisms mapped from first-party records. These labels describe what the harness provides, not how intelligent its model is.

7/7layers documented
  • Execution & isolationHost processDocumented mechanism, not a performance score.
  • Tooling & integrationsExtensible toolsDocumented mechanism, not a performance score.
  • Context & stateManaged contextDocumented mechanism, not a performance score.
  • Lifecycle & recoverySession resumeDocumented mechanism, not a performance score.
  • ObservabilityLogs/transcriptsDocumented mechanism, not a performance score.
  • VerificationTool-assistedDocumented mechanism, not a performance score.
  • Governance & permissionsApproval promptsDocumented mechanism, not a performance score.

Measured and public context

Configuration-specific measurements and source-native activity stay separate from general product capability.

Inspect code audit, measured configurations, and ecosystem signalsContext, not a product score

Public code audit

3/5public artifacts present
Security policy
Not found
CI workflow
Present at inspected commit
Automated tests
Present at inspected commit
Evaluation assets
Not found
Contributor documentation
Present at inspected commit

The repository includes cross-platform CI, unit, integration, end-to-end, and VCR-backed agent tests; these are project-owned engineering tests, not an independent harness benchmark or a public performance result. No security policy or dedicated evaluation suite was found.

Inspect commit def12cc6d8e162d6f48a7db260dde5ea3cc5f906, checked 2026-07-27

Measured configurations

No benchmark run passes the full metadata admission policy for this harness yet. Missing data is not scored as zero.

Benchmark policy and all runs
Context, not quality

Public ecosystem signals

Source-native observations for exact mapped artifacts and reviewed stable release trains. Different units and populations stay separate, and missing coverage is never treated as zero.

View this harness in Usage
  • Latest stable releasev0.92.0Released 2026-08-31; 21 stable releases in 90 daysOpen release
  • OpenRouter 30d tokens97.15B#27 coding app; 2026-08-09 to 2026-09-07Open app page
  • npm last-month downloads47.36KPackage: @charmland/crushOpen artifact
  • Release asset downloads997.47K182 stable releases; 7083 matched assetsOpen artifact
  • GitHub stars27.95KFull-source repository; 2.23K forksOpen artifact

Routing, package retrievals, release downloads, editor installs, and repository interest observe different populations. They are never added together and never affect capability evidence, classification, or measured results.

Interpretation rulesSignals checked

First-party evidence

Each capability claim links to the first-party record that supports it.

20 first-party sourcesProduct record checked

Additional first-party sources

20 sources
View 19 more sources

Ecosystem context

OpenRouter coding apps Discovery signal only; usage rank is not used as a quality or capability score. Observed 2026-07-27.