Show line-by-line authorship information for a file
AI agents call git-blame to retrieve information from GitHub MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
git-blame is a standard Git inspection command that retrieves and displays historical authorship data. It has no side effects on the repository state, files, or any external systems. It purely reads and presents information, making it a Read category risk. Severity is low because even if an AI agent misuses this tool, it can only query existing metadata with no destructive potential.
From the tool's definition Tool name 'git-blame' and description 'Show line-by-line authorship information for a file' indicate a read-only operation that queries version control metadata without modifying, executing code, or deleting data.
Attacks that exploit this kind of access
Show line-by-line authorship information for a file. It is categorised as a Read tool in the GitHub MCP Server MCP Server, which means it retrieves data without modifying state.
Register the GitHub MCP Server MCP server in PolicyLayer and add a rule for git-blame: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches GitHub MCP Server. Nothing to install.
git-blame is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the git-blame rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for git-blame. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
git-blame is provided by the GitHub MCP Server MCP server (jungchihoon/github-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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