Returns the ground-truth schema of your Firestore collections by sampling real documents. For each collection you get field names, observed types, and presence rates. Use this BEFORE writing any database code to avoid hallucinating field names. Stable fields (≥80% presence, single type) are safe ...
Part of the Lintbase MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents call lintbase_get_schema to retrieve information from Lintbase 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 lintbase_get_schema 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:
lintbase_get_schema:
rules:
- action: allowSee the full Lintbase policy for all 3 tools.
Agents calling read-class tools like lintbase_get_schema 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.
Returns the ground-truth schema of your Firestore collections by sampling real documents. For each collection you get field names, observed types, and presence rates. Use this BEFORE writing any database code to avoid hallucinating field names. Stable fields (≥80% presence, single type) are safe to use. Fields marked with a note need attention (drift, sparse, or optional).. It is categorised as a Read tool in the Lintbase MCP Server, which means it retrieves data without modifying state.
Add a rule in your Intercept YAML policy under the tools section for lintbase_get_schema. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Lintbase MCP server.
lintbase_get_schema 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 lintbase_get_schema 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 lintbase_get_schema. 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.
lintbase_get_schema is provided by the Lintbase MCP server (lintbase-mcp). 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