Caveat verdict
free-feishu-voice
Executes processes AND makes external network calls
Feishu (Lark) voice message sender that reads user-configured credentials from a local config file, generates audio with espeak-ng/ffmpeg, and uploads to open.feishu.cn — all behavior matches the stated purpose of sending voice messages to the user's own Feishu workspace.
Automated static analysis — not a human review. Caveat flags capabilities, not confirmed intent, and can produce false positives. Disagree with this verdict? Use Dispute below.
What it does
These are capability combinations: each listed behavior occurs in the skill, but Caveat detects co-occurrence — it does not verify that one flows into another. Read the code to confirm a live chain.
Executes processes AND makes external network calls — may exfiltrate command output
LLM02 · LLM06 · ASI03
Installs packages AND executes processes — opaque dependency chain with execution
LLM03 · ASI04
Permission integrity
network_out
package_install
Findings (5)
Possible hardcoded credential
SKILL.md · code · SECRET="${FEISHU_APP_SECRET:-$APP_SECRET}
subprocess execution — runs system commands from Python
SKILL.md · code · subprocess.run(
References sudo — requests elevated privileges
SKILL.md · code · sudo
yum install — installs system packages
SKILL.md · code · yum install
pip3 install — installs Python packages at runtime
SKILL.md · code · pip3 install
Why the tier is capped
Execution sink present in raw bytes (Hard Floor: class D). Final tier capped at Caution — cannot be lifted by any downgrade, example-payload opt-in, or allowlist.
Permissions & capabilities
No declared permissions — minimal attack surface.
network_outcredential_accessprocess_execpackage_install Thanks — recorded.