tsc
Runs the TypeScript compiler and returns structured diagnostics (file, line, column, code, message).
This record as markdown: /tools/io-github-dave-london-github/tsc.md
What tsc does on Github
AI agents invoke tsc to trigger actions in Github. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.
Why tsc is rated High
This tool executes an external process (the TypeScript compiler) on the host system. While its primary purpose is diagnostics/checking, running a compiler is an Execute-category action. Misuse could trigger compilation of arbitrary TypeScript with potential side effects (e.g., emit output files, run plugins). Severity is medium as the blast radius is generally limited to the local environment.
From the tool's definition 'Runs the TypeScript compiler' — actively executes the tsc compiler process on the system
Attacks that exploit this kind of access
The rule that runs tsc safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Github, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For tsc, this is the rule to start with:
tsc stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Github, apply this rule, and every tsc call is checked against it from then on.
Questions about tsc
Runs the TypeScript compiler and returns structured diagnostics (file, line, column, code, message). It is categorised as a Execute tool in the Github MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Github MCP server in PolicyLayer and add a rule for tsc: 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. Nothing to install.
tsc is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the tsc 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 tsc. 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.
tsc is provided by the Github MCP server (@paretools/github). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
More on Github, and thousands of servers like it.
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