Lookup, search, or browse sources (books, speeches, articles, etc.). Use name= for exact match, search= for fuzzy, by= to filter by author. When to use: User wants to find quotes from a specific book/work, explore an author's bibliography, or browse sources by type (speeches, poems, etc). Behavio...
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AI agents call sources to retrieve information from Quotewise 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 sources 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.
{
"version": "1",
"default": "deny",
"tools": {
"sources": {}
}
}See the full Quotewise policy for all 18 tools.
These attack patterns abuse exactly the kind of access sources gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Lookup, search, or browse sources (books, speeches, articles, etc.). Use name= for exact match, search= for fuzzy, by= to filter by author. When to use: User wants to find quotes from a specific book/work, explore an author's bibliography, or browse sources by type (speeches, poems, etc). Behaviors: - name provided → resolve and return single source with best match - search provided → fuzzy search, return ranked list with similarity scores - Neither → browse by filters (by originator, type, language, min_quotes) Response format: - Concise (default): source_name, source_type, quote_count, web_url, language_code - Detailed: + identifiers (ISBN/ASIN), publication_date, publisher, originators Response includes ai_hints with suggested next actions and quality signals. Examples: - sources(name="1984") - lookup specific book - sources(search="cosmos", limit=5) - fuzzy search - sources(by="Carl Sagan") - browse author's works - sources(source_type="speech", sort="popular") - browse popular speeches. It is categorised as a Read tool in the Quotewise MCP Server, which means it retrieves data without modifying state.
Register the Quotewise MCP server in PolicyLayer and add a rule for sources: 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 Quotewise. Nothing to install.
sources 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 sources 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 sources. 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.
sources is provided by the Quotewise MCP server (https://mcp.quotewise.io/). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 18 Quotewise tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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