halfcycle@0.5.3
Your coding agents are the engineers. Halfcycle is the rest of the team: it scopes, designs, plans and reviews production software, and runs the build for Claude Code and Codex.
AI Security Review
scanned 4d ago · by lpm-firewall-aiThe scanner’s process and credential indicators map to the package’s repository workflow CLI. The traced credential flow uses the configured or Halfcycle-owned service, and the manifest contains no install lifecycle hook.
Static reason
High-risk behavior combination matched malicious policy.; previous stored version diff introduced dangerous source
Trigger
The CLI runs when a user invokes halfcycle; no install-time hook was found.
Impact
No malicious impact was identified in the reviewed credential, network, or process flows.
Mechanism
The CLI reads Halfcycle credentials and uses them with the configured or default Halfcycle service.
AI rationale
The scanner’s process and credential indicators map to the package’s repository workflow CLI. The traced credential flow uses the configured or Halfcycle-owned service, and the manifest contains no install lifecycle hook.
Network endpoints1
control.halfcycle.ai
Decision evidence
public snapshotAI called this Clean at 93.0% confidence as Benign with low false-positive risk.
Evidence for AI clean decision
- The manifest has no install, preinstall, or postinstall lifecycle hook; its scripts are build and test commands.
- The package exposes a CLI entry point, and its launcher imports the CLI when invoked.
- The CLI reads Halfcycle credentials from its environment or the engagement store named by the project pin.
- The credential-bearing request sends a bearer token to the resolved service URL; the default control host is control.halfcycle.ai.
Evidence against
- The package describes itself as a tool for AI coding-agent workflows and repository builds.
- The reviewed process execution is part of the CLI and its Git or bundled-runner operations; no reverse-shell behavior was confirmed.
Behavioral surface
ChildProcessCryptoEnvironmentVarsEvalFilesystemNetworkShell
HighEntropyStringsUrlStrings
Source & flagged code
12 flaggedbin/bin.bundle.mjsView file
15138const program = [
L15139: "const p=require(`path`),f=require(`fs`),c=require(`child_process`);",
L15140: "let d=process.cwd();",
High
Child Process
Package source references child process execution.
bin/bin.bundle.mjsView on unpkg · L1513814671var WRITE_CAPABLE_TOOLS = ["Edit", "MultiEdit", "NotebookEdit", "Write"];
L14672: var PRE_TOOL_USE_MATCHER = "^(Bash|Read|Grep|Write|Edit|MultiEdit|NotebookEdit|Agent|PowerShell)$";
L14673: function hookCommand(script, verb) {
High
8// dist/guard-origin.js
L9: var DEFAULT_GUARD_ORIGIN = "https://guard.halfcycle.ai";
L10: function resolveGuardOrigin(env) {
...
L26: ZodArray: () => ZodArray,
L27: ZodBase64: () => ZodBase64,
L28: ZodBase64URL: () => ZodBase64URL,
...
L1487: error: new (_Err ?? $ZodError)(result.issues.map((iss) => finalizeIssue(iss, ctx, config())))
L1488: } : { success: true, data: result.value };
L1489: };
...
L14671: var WRITE_CAPABLE_TOOLS = ["Edit", "MultiEdit", "NotebookEdit", "Write"];
L14672: var PRE_TOOL_USE_MATCHER = "^(Bash|Read|Grep|Write|Edit|MultiEdit|NotebookEdit|Agent|PowerShell)$";
L14673: function hookCommand(script, verb) {
Low
Findings
3 Critical7 High4 Medium6 Low
CriticalReverse Shelldist/cli.js
CriticalTrigger Reachable Dangerous Capabilitydist/cli.js
CriticalPrevious Version Dangerous Deltadist/index.js
HighChild Processbin/bin.bundle.mjs
HighShellbin/bin.bundle.mjs
HighSame File Env Network Executiondist/cli.js
HighCredential Redirect Persistencedist/cli.js
HighSandbox Evasion Gated Capabilitydist/cli.js
HighCross File Remote Execution Contextdist/cli.js
HighRuntime Package Installdist/cli.js
MediumNetwork
MediumEnvironment Vars
MediumShips Build Helper
Affected versions and remediation
This report applies to halfcycle@0.5.3.
See all versions of halfcycle for other recorded verdicts.
- Review the evidence and your use of halfcycle@0.5.3 before allowing it. Restrict the permissions described in this report.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
Evidence last updated: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.