Verify a line number from a compressed view against the raw file. Since compressed output preserves original line numbers via virtual markers, this confirms the line content matches. Returns the raw line with ±5 lines of context. Optionally pass expected_content to verify the match. Use before ed...
AI agents call fullscope_verify_line to retrieve information from Mcp Agent Opt without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
fullscope_verify_line is a read-only inspection tool that retrieves and validates file content against compressed representations. It has no side effects, creates no new data, executes no code, and makes no modifications. The mention of using it 'before editing' refers to upstream actions, not actions this tool performs.
From the tool's definition Tool description states it 'Verify a line number' and 'Returns the raw line with ±5 lines of context' — core function is retrieval. The optional 'expected_content' parameter is for comparison/verification, not modification.
Attacks that exploit this kind of access
Verify a line number from a compressed view against the raw file. Since compressed output preserves original line numbers via virtual markers, this confirms the line content matches. Returns the raw line with ±5 lines of context. Optionally pass expected_content to verify the match. Use before editing to confirm the exact location. It is categorised as a Read tool in the Mcp Agent Opt MCP Server, which means it retrieves data without modifying state.
Register the Mcp Agent Opt MCP server in PolicyLayer and add a rule for fullscope_verify_line: 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 Mcp Agent Opt. Nothing to install.
fullscope_verify_line 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 fullscope_verify_line 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 fullscope_verify_line. 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.
fullscope_verify_line is provided by the Mcp Agent Opt MCP server (justguy/fullscope-mcp). 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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