halfcycle@0.3.40
Your coding agents are the engineers. Halfcycle is the rest of the team: product owner, architect, planner and independent reviewer for Claude Code.
AI Security Review
scanned 26d ago · by lpm-firewall-aiThe CLI explicitly installs agent hooks and settings, with credential access routed through the Halfcycle runner. The inspected evidence supports a warning for this agent configuration capability, but does not establish an active attack or credential theft.
Static reason
One or more suspicious static signals were detected.
Trigger
A user invokes the `halfcycle` install command for a repository.
Impact
The configured agent can access the engagement credential and run Halfcycle hooks, creating a guarded agent configuration capability.
Mechanism
The installer merges generated settings and writes hook scripts that invoke the bundled runner; the runner loads the engagement credential file.
AI rationale
The CLI explicitly installs agent hooks and settings, with credential access routed through the Halfcycle runner. The inspected evidence supports a warning for this agent configuration capability, but does not establish an active attack or credential theft.
Evidence
package.jsondist/bin.jsdist/engagement-credential.d.tsdist/index.jsbin/bin.bundle.mjs.claude/settings.json.claude/hooks/guard-runner.sh.halfcycle/bin/bin.bundle.mjs
Decision evidence
public snapshotAI called this Suspicious at 85.0% confidence as Dangerous Capability with medium false-positive risk.
Evidence for warning
- The `halfcycle` executable is the package’s CLI entrypoint.
- The CLI’s install flow merges generated Claude Code settings and installs hooks into a target repository.
- The package configures a runner that sources the engagement credential file into its environment; this enables agent-side access to the credential.
Evidence against
- The manifest declares no install-time lifecycle hook; the configuration changes occur through the CLI install command.
- The inspected code does not establish covert credential theft or an unrelated credential recipient.
Behavioral surface
ChildProcessCryptoEnvironmentVarsEvalFilesystemNetwork
HighEntropyStringsUrlStrings
Source & flagged code
5 flaggedbin/bin.bundle.mjsView file
15700// dist/git.js
L15701: import { spawnSync } from "node:child_process";
L15702: import { readFileSync } from "node:fs";
High
Child Process
Package source references child process execution.
bin/bin.bundle.mjsView on unpkg · L15700dist/bin.jsView file
3070// dist/control-origin.js
L3071: var DEFAULT_CONTROL_ORIGIN = "https://control.halfcycle.ai";
L3072: function resolveControlOrigin(env = process.env) {
L3073: const configured = env["HALFCYCLE_SERVICE_URL"]?.trim();
...
L3082: // dist/device-signin.js
L3083: import { spawn } from "node:child_process";
L3084: import { platform as platform3 } from "node:os";
High
Same File Env Network Execution
A single source file combines environment access, network access, and code or shell execution; review context before blocking.
dist/bin.jsView on unpkg · L30703252function defaultWrite(text) {
L3253: process.stdout.write(text);
L3254: }
L3255: function defaultSleep(ms) {
L3256: return new Promise((resolve4) => setTimeout(resolve4, ms));
L3257: }
...
L3262: return {
L3263: command: "cmd.exe",
L3264: args: ["/d", "/s", "/c", `"start "" "${url}""`],
Findings
5 High2 Medium5 Low
HighChild Processbin/bin.bundle.mjs
HighSame File Env Network Executiondist/bin.js
HighCommand Output Exfiltrationdist/bin.js
HighCross File Remote Execution Contextdist/bin.js
HighTrigger Reachable Command Output Exfiltrationdist/bin.js
MediumNetwork
MediumEnvironment Vars
LowScripts Present
LowEval
LowFilesystem
LowHigh Entropy Strings
LowUrl Strings
Affected versions and remediation
This report applies to halfcycle@0.3.40.
See all versions of halfcycle for other recorded verdicts.
- Review the evidence and your use of halfcycle@0.3.40 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: .
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