Index an entire codebase directory for later search. Scans all supported source files, chunks them, and stores in the knowledge base with keyword and semantic indexes. Supports incremental indexing — unchanged files are skipped.
Accepts file system path (path); Bulk/mass operation — affects multiple targets
Part of the Vibe Hnindex MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents call index_codebase to retrieve information from Vibe Hnindex without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though index_codebase only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
tools:
index_codebase:
rules:
- action: allowSee the full Vibe Hnindex policy for all 21 tools.
Agents calling read-class tools like index_codebase have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Read risk category across the catalogue. The same policy patterns (rate-limit, allow) apply to each.
Index an entire codebase directory for later search. Scans all supported source files, chunks them, and stores in the knowledge base with keyword and semantic indexes. Supports incremental indexing — unchanged files are skipped.. It is categorised as a Read tool in the Vibe Hnindex MCP Server, which means it retrieves data without modifying state.
Add a rule in your Intercept YAML policy under the tools section for index_codebase. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Vibe Hnindex MCP server.
index_codebase 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 index_codebase rule in your Intercept 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 Intercept policy for index_codebase. 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.
index_codebase is provided by the Vibe Hnindex MCP server (vibe-hnindex). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept