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Build a narrow, read-only MCP tool that fetches a page, extracts bounded text, and returns that text with source metadata. The stdio transport carries the MCP conversation between a client and a local server process; it does not provide a durable page cache, conversation state, or a standard citation record. Those are application responsibilities.
What stdio MCP provides—and what you still need to build
In the TypeScript SDK v1 server guide, StdioServerTransport connects an MCP server to a client that starts it as a child process. MCP messages use JSON-RPC over the process’s standard input and output. Keep that channel reserved for protocol traffic: write diagnostics to standard error so log lines cannot corrupt the stream.
The protocol is not a web-fetching service by itself. The reference fetch server demonstrates URL retrieval and conversion of page content to Markdown, including output-length limits and a start_index continuation option. Nor does stdio make requests in one conversation automatically available as state for later requests. The MCP basic specification revision dated 2026-07-28 says request processing must not rely on earlier requests; if your application needs to associate requests, pass an explicit identifier.
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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Likewise, an MCP connection does not promise a durable cache or a canonical citation format. The Fetch Standard describes HTTP cache behavior, but choosing cache keys, retention, invalidation, and provenance fields for stored extracted text is an application design decision.
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Design a bounded fetch tool
Start with one read-only operation such as fetch_page(url). A deliberately narrow interface is easier to secure and explain than a general-purpose request proxy. The reference server is useful as an extraction example, not as proof that arbitrary URL retrieval is safe: its README warns that the server can access local and internal IP addresses.
- Parse and normalize the input. Accept only the URL forms and schemes your deployment intends to support. Reject malformed URLs and embedded credentials. Normalize consistently before applying policy or constructing a cache key.
- Enforce destination policy. If the tool is meant to read public websites, resolve the hostname and reject private, loopback, link-local, and other special-use addresses. Apply the same checks to redirect destinations before following them; do not assume that a safe initial URL makes the final destination safe.
- Bound network work. Set connection and total timeouts, a redirect-count limit, and a maximum response size. Stop reading when the byte limit is reached rather than downloading an unbounded response and truncating it afterward.
- Check what you received. Handle HTTP status and content type explicitly. Send supported HTML through a bounded extractor; reject or handle other formats only if your tool is designed for them. Limit parsing work as well as response bytes.
- Return a clear result or failure. Distinguish blocked destinations, network errors, unsupported media types, extraction failures, and truncation. Include whatever trustworthy response metadata is available, but never fill missing page text with a guess.
These controls are application safeguards, not guarantees supplied by stdio. The MCP specification revision dated 2026-07-28 also cautions against automatic network dereferencing of JSON Schema references and recommends bounding schema-validation work; the broader lesson is to place explicit limits around network and parsing operations.
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Return text with provenance the model can use
Do not return extracted prose as an unattributed blob. Pair it with a compact source record so a caller can distinguish what was requested from what was actually fetched. The following is an application-designed example, not a canonical MCP citation schema:
{
"requested_url": "https://example.org/article",
"final_url": "https://www.example.org/article",
"fetched_at": "2026-10-11T12:00:00Z",
"title": "Article title",
"status": 200,
"text": "Extracted page text...",
"truncated": false,
"next_start_index": null
}Use an actual fetch timestamp and response status, and include a title only when extraction is reliable. If output is truncated, make that explicit and provide a continuation position when your interface supports one. The reference fetch tool’s start_index option illustrates offset-based continuation; the client must retain and advance the offset correctly.
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When splitting a page into chunks, keep each passage attached to its source record and, where feasible, a section identifier or text span. In the model-facing instructions, require citations to refer only to returned source records, and require the model to say when those records do not support a claim. Treat fetched page text as untrusted data, not as instructions that can replace system policy or tool rules.
Choose a cache policy deliberately
A result cache is different from relying on HTTP’s ordinary cache semantics. The Fetch Standard describes cache modes, including use of a matching fresh response by default, but it does not prescribe a persistent cache for your MCP application or decide how long your extracted Markdown remains useful.
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A practical cache key includes the normalized requested URL and every request option that can change the result, such as extraction mode or output limits. Store the fetched and extracted forms only when the intended use justifies their retention. Useful record fields include fetch time, expiry, status, relevant response validators such as ETag or Last-Modified, and the final redirected URL. Make freshness visible to the tool caller rather than presenting old content as newly fetched.
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| Approach | Durability | Privacy and retention | Invalidation and concurrency | Operational footprint |
|---|---|---|---|---|
| Short-lived in-memory cache | Lost when the server process exits. | Content stays within process memory and is not retained across restarts by the cache. | Simple expiry and invalidation; concurrent requests still need sensible coordination to avoid duplicate work or inconsistent updates. | Lowest storage complexity; bounded memory use still needs an explicit limit. |
| Persistent local cache | Can survive process restarts. | Fetched content remains on disk until expiry or deletion, so retention and access controls matter. | Requires explicit expiry, invalidation, and coordination for concurrent reads and writes. | Adds storage management, cleanup, and recovery considerations. |
For either design, decide how to handle error responses, redirects, stale entries, and responses marked no-store. Use validators when the origin supports them, and define whether a failed revalidation may serve stale content; if it does, label that result as stale. Never let a cached result bypass current destination policy: validate the requested destination before retrieval, and retain the final URL so redirect policy remains auditable.
Choose how large pages are delivered
| Result pattern | Useful when | Trade-off |
|---|---|---|
| One bounded result | Pages are small enough for the tool’s output budget. | Simpler for clients, but large pages must be cut off or rejected at the limit. |
| Offset-based continuation | A caller may need more of a long extracted page. | Preserves access to later text without returning everything at once, but the client must track offsets and avoid skipping or repeating spans. |
Whichever pattern you choose, state whether offsets refer to extracted characters or another stable unit, and make truncation unmistakable. A limit is useful only if the caller can tell what was omitted and how to request the next part.
Respect robots rules without treating them as access control
The reference fetch server checks robots.txt by default for model-initiated fetches. RFC 9309 describes the Robots Exclusion Protocol as crawler guidance: it is not authentication, authorization, or a network security boundary. Honor the documented crawler behavior where applicable, but do not use robots compliance as a substitute for destination allowlists, authentication checks, or private-network blocking.
If a robots rule blocks a fetch, report that outcome rather than silently returning content. The same applies to network failures, unsupported content types, and extraction errors. Report source metadata only when it is actually available.
Check SDK and reference-server compatibility
The transport example above is specific to the TypeScript SDK v1 guide; do not assume its exact imports or API surface apply unchanged to every SDK major version. The reference fetch server README specifies MCP Python SDK 1.x, with the range mcp>=1.29.0,<2, and notes that SDK 2.0 renamed APIs while a port was in progress. Check the package’s current compatibility information before using its installation instructions or copying code.
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