Edits a symbol (function, class, method, etc.) by name and type in a given file using LSP.
AI agents use edit_symbol to create or update resources in Vsc — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Vsc environment.
The tool modifies code by editing symbols (functions, classes, methods) within files. This is a Write operation because it creates or modifies data reversibly — edits can be undone or reverted, unlike destructive deletions.
From the tool's definition Tool description states it 'Edits a symbol (function, class, method, etc.) by name and type in a given file' — this is a modification operation that changes code content reversibly.
Documented attack patterns abuse exactly the kind of access edit_symbol gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Vsc, and nothing reaches the server without passing your rules. This is the rule we recommend for edit_symbol:
{
"version": "1",
"default": "deny",
"tools": {
"edit_symbol": {
"limits": [
{
"counter": "edit_symbol_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}edit_symbol stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Edits a symbol (function, class, method, etc.) by name and type in a given file using LSP. It is categorised as a Write tool in the Vsc MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Vsc MCP server in PolicyLayer and add a rule for edit_symbol: 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 Vsc. Nothing to install.
edit_symbol is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the edit_symbol 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 edit_symbol. 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.
edit_symbol is provided by the Vsc MCP server (thomasgazzoni/vsc-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 7 Vsc tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
7 Vsc tools catalogued and risk-classified — across an index of 42,500+ MCP servers.