halfcycle@0.7.0
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 2d ago · by lpm-firewall-aiThe package has no install lifecycle hook, and the reviewed credentials are used with Halfcycle service requests for project setup and evaluation. The reverse-shell signal corresponds to a loopback-only sign-in callback, not a remote shell.
Static reason
High-risk behavior combination matched malicious policy.; previous stored version diff introduced dangerous source
Trigger
Explicit CLI use or agent evaluation through the installed Halfcycle runner.
Impact
No unauthorized credential transfer, unrelated execution, or other attack behavior was identified.
Mechanism
Uses Halfcycle service credentials with the configured control and guard service endpoints; the CLI sign-in callback is loopback-only and state-checked.
AI rationale
The package has no install lifecycle hook, and the reviewed credentials are used with Halfcycle service requests for project setup and evaluation. The reverse-shell signal corresponds to a loopback-only sign-in callback, not a remote shell.
Network endpoints2
control.halfcycle.aiapp.halfcycle.ai
Decision evidence
public snapshotAI called this Clean at 94.0% confidence as Benign with low false-positive risk.
Evidence for AI clean decision
- The manifest describes Halfcycle as an AI-agent workflow tool and defines a CLI and library entry point, with no install lifecycle hook.
- The CLI uses Halfcycle's control service by default; its install flow runs when the user invokes the CLI's install form.
- The library sends an engagement creation request containing a project name or derived name, with the supplied Halfcycle credential.
- The bundled runner sends an evaluation request with a Halfcycle bearer token to its configured guard service; the request is built from the change set and context.
- The flagged HTTP server binds to loopback and rejects requests from non-loopback peers.
Evidence against
Behavioral surface
ChildProcessCryptoEnvironmentVarsEvalFilesystemNetworkShell
HighEntropyStringsUrlStrings
Source & flagged code
11 flaggedbin/bin.bundle.mjsView file
15166const program = [
L15167: "const p=require(`path`),f=require(`fs`),c=require(`child_process`);",
L15168: "let d=process.cwd();",
High
Child Process
Package source references child process execution.
bin/bin.bundle.mjsView on unpkg · L1516614671var 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 Critical6 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
HighSandbox Evasion Gated Capabilitydist/cli.js
HighCross File Remote Execution Contextdist/cli.js
HighRuntime Package Installdist/cli.js
MediumNetwork
MediumEnvironment Vars
MediumShips Build Helperbin/pre-tool-use-filter.sh
MediumStructural Risk Force Deep Review
Affected versions and remediation
This report applies to halfcycle@0.7.0.
See all versions of halfcycle for other recorded verdicts.
- Review the evidence and your use of halfcycle@0.7.0 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.