Claude Code, Skill
Handler
Handler is an open-source A2A protocol client for software engineers building, testing, and operating agentic systems.
Compatibility: Not stated.
Grade C
One Medium finding. Read the findings before installing.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
PERMISSION_SHELL_UNDECLARED
Why this grade
- PERMISSION_SHELL_UNDECLARED Medium
Runs shell commands that the manifest or description does not mention.
src/a2a_handler/cli/__init__.py, line 226
result = subprocess.run(command, check=False)
Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.
Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.
What was checked
Plain notes from the hygiene checks.
Permissions
Concern
requests shell access. No manifest field names shell or command execution.
PERMISSION_SHELL_UNDECLARED
src/a2a_handler/cli/__init__.py, line 226
result = subprocess.run(command, check=False)
src/a2a_handler/cli/schema.py, line 75
current = current.commands.get(token) # type: ignore[assignment]
Install and update
Pass
No install-time script found, and dependencies are pinned or absent.
Network
Pass
No network call found.
Secrets
Concern
reads a credential or environment file.
SECRETS_PATH_DOTENV
src/a2a_handler/cli/__init__.py, line 54
"""Click group that loads workspace .env before option envvars resolve."""
src/a2a_handler/common/dotenv.py, line 9
"""Load a .env file by searching upward from the current working directory.
.gitignore, line 40
# Environment
Show more
.gitignore, line 41
.env
docs/guides/messages-tasks.mdx, line 211
`HANDLER_STREAM_READ_TIMEOUT`, including from a workspace `.env` file. Streaming
Agent instructions
Pass
No instruction to ignore earlier instructions or to hide a step.
Obfuscation
Note
a file was over the read cap and was not fully read.
OBFUSCATION_FILE_OVER_READ_CAP
uv.lock, line 1
version = 1
Licence
Pass
A licence file is present (LICENSE).
Maintainer activity
Pass
The latest commit is within the last 365 days.
Note
Hygiene check of commit 84518360e0a9. requests shell access. No manifest field names shell or command execution. reads a credential or environment file. a file was over the read cap and was not fully read.
Date and source
Date checked:
github.com
Commit graded: 84518360e0a941e6ef3c2c5537d4a257d9ea3cbe
This link goes to the original host. PlugVet does not host or check what you download from there, and installing it is your own decision and risk.