Commit graph

15 commits

Author SHA1 Message Date
Jeremiah Lowin
f9ed06176a
fix: route ResourcesAsTools/PromptsAsTools through server middleware (#3495)
* fix: enforce auth/visibility in ResourcesAsTools and PromptsAsTools for non-FastMCP providers

🤖 Co-authored-by: Claude <noreply@anthropic.com>

* fix: honor stdio auth bypass and correct transform ordering in provider wrappers

Co-authored-by: Claude <noreply@anthropic.com>

* fix: move context/dependencies imports into function to break circular import

* fix: route ResourcesAsTools/PromptsAsTools through ctx.fastmcp

Instead of manually reimplementing auth, visibility, and session
transforms in the transform layer, tool functions now call
ctx.fastmcp.read_resource() / ctx.fastmcp.render_prompt() which
routes through the server's full middleware chain. This matches
the pattern CodeMode uses with ctx.fastmcp.call_tool().

The isinstance(provider, FastMCP) branching is removed entirely.

* feat: add _scope parameter for provider-scoped listing

AggregateProvider can now filter which child providers to query when
listing components. ResourcesAsTools and PromptsAsTools use this to
scope listings to their configured provider while still routing
through ctx.fastmcp for full middleware coverage.

The scope matching walks wrapped providers, so a
WrappedProvider(Namespace, inner=MyProvider) matches if MyProvider
is in the scope list.

* test: add coverage for ResourcesAsTools scoped to a sub-server

* fix: delegate to super() when _scope is None, add AggregateProvider to scope matching

* simplify: remove _scope machinery, route everything through ctx.fastmcp

Reverts the _scope parameter from Provider/AggregateProvider/Server.
ResourcesAsTools and PromptsAsTools now simply route through
ctx.fastmcp for all operations. Apply to a FastMCP server instance
for proper auth/visibility/middleware coverage.

Tests rewritten to use FastMCP server directly instead of raw providers.

* warn when ResourcesAsTools/PromptsAsTools is applied to a non-FastMCP provider

* docs: explain that ResourcesAsTools/PromptsAsTools should wrap a FastMCP server

* raise TypeError instead of warning when applied to non-FastMCP provider

---------

Co-authored-by: Claude <noreply@anthropic.com>
2026-03-15 16:35:54 -04:00
Jeremiah Lowin
e1338e06a2 Set readOnlyHint=True on ResourcesAsTools generated tools 2026-03-13 17:32:21 -05:00
Jeremiah Lowin
404b820144
Add ListTools, search limit, and catalog size annotation to CodeMode (#3359)
* Add tests for two-stage pattern, empty full-detail results, empty inputs

* Add ListTools, search limit, catalog size annotation; split tests

Co-authored-by: Claude <noreply@anthropic.com>

* Remove BM25 internal cap so Search.limit is the sole truncation point

* Pass default_limit to BM25 instead of arbitrary high cap

---------

Co-authored-by: Claude <noreply@anthropic.com>
2026-03-02 18:00:21 -05:00
Jeremiah Lowin
2ab8beb195
Remove system role references from docs (#3356)
The MCP spec only supports "user" and "assistant" roles for prompt
messages. Fixes #3160.

Co-authored-by: Marvin Context Protocol <41898282+Marvin Context Protocol@users.noreply.github.com>
Co-authored-by: Jeremiah Lowin <jlowin@users.noreply.github.com>
2026-03-02 16:36:24 -05:00
Jeremiah Lowin
59da3e4ed4
Decompose CodeMode into composable discovery tools (#3354)
* Decompose CodeMode into composable discovery tools

CodeMode now owns only the execute sandbox. Discovery tools (search,
get_schema, etc.) are composable via the discovery_tools parameter.
Each is a Callable[[GetToolCatalog], Tool] factory.

Ships SearchTool (lightweight name+description results) and SchemaTool
(brief markdown or full JSON schemas by tool name) as built-in defaults.

* Rename to Search/GetSchemas/Tags, add tag filtering, fix bugs

- Rename SearchTool→Search, SchemaTool→GetSchemas, Categories→Tags
- Add tags parameter to Search for LLM-side tag filtering
- Add Tags discovery tool for browsing tools by tag
- Fix shared singleton default factories (now per-instance)
- Fix get_schema full mode returning invalid JSON on partial matches
- Fix "untagged" filter inconsistency between Tags and Search
- Split serialization tests to comply with loq line limit
- Rewrite docs for conceptual clarity

* Add three-tier detail levels, remove default_arguments, rename Tags→GetTags, rewrite docs

* Clean up __all__ exports, return valid JSON for empty full-detail results
2026-03-02 16:35:55 -05:00
Magnus
1e72f2457b
Add search_result_serializer hook and serialize_tools_for_output_markdown (#3337) 2026-03-01 14:20:24 -05:00
Jeremiah Lowin
0afd990ee6 Improve code-mode docs formatting; add docs formatting guideline 2026-02-27 21:38:07 -05:00
Jeremiah Lowin
75d6e2fc10 Document resource limits for MontySandboxProvider 2026-02-27 21:38:07 -05:00
Jeremiah Lowin
14e64b3b22 Use transforms= kwarg in docs examples 2026-02-27 21:28:34 -05:00
Jeremiah Lowin
09a99e1ecc Accept transforms as FastMCP init kwarg 2026-02-27 21:28:34 -05:00
Adam Azzam
b9153404f4
Add experimental CodeMode transform (#3297)
* code mode

* update uv.lock for monty optional dep

🤖 Generated with Claude Code

* retry CI

* Address PR review comments on CodeMode transform

🤖 Generated with Claude Code

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Fix ty unresolved-attribute error on search_helper

🤖 Generated with Claude Code

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* more idiomacy

* harden

* fix docs

* harden

* fix red CI

* Refactor CodeMode to use CatalogTransform base class

Removes the duplicate ContextVar bypass pattern in favor of the shared
CatalogTransform machinery. Also fixes a pre-existing bug where
`from __future__ import annotations` caused NameError for Annotated
in nested function scopes at runtime.

* Remove redundant _get_visible_tools wrapper in CodeMode

* Rewrite CodeMode docs with proper motivation and structure

* Fix type narrowing in collision test

* Stop unwrapping tool results in CodeMode's call_tool

call_tool() inside execute blocks now returns structured content as-is,
preserving the {"result": value} wrapping. This means the output schema
shown in search results accurately describes what call_tool() returns,
so LLMs can trust the schema when writing code.

Also adds examples/code_mode/ with a server and narrated client demo.

* Simplify call_tool return type: dict | str

* Fix example client to unwrap structured results

* Let server resolve tool versions instead of pinning first match

* Rewrite CodeMode docs to match current behavior

* Rename optional extra from monty to code-mode

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Jeremiah Lowin <153965+jlowin@users.noreply.github.com>
2026-02-27 12:14:03 -05:00
Jeremiah Lowin
c96c0400f3
feat: Search transforms for tool discovery (#3154)
* feat: Add search transforms for tool discovery

RegexSearchTransform and BM25SearchTransform collapse large tool
catalogs into a search interface so LLMs discover tools on demand
instead of receiving the full listing.

* chore: Update SDK documentation

* fix: call_tool recursion guard, atomic BM25 rebuild, hash includes descriptions

* Extract CatalogTransform base class for catalog-aware transforms

Transforms that replace list_tools() with synthetic components (like
search) need to read the real catalog at call time without triggering
their own replacement logic. CatalogTransform handles the re-entrant
bypass via per-instance ContextVar, exposing transform_tools() as the
subclass hook and get_tool_catalog() for catalog access.

* Add search transform examples for regex and BM25

* Add README for search transform examples

* Polish search example clients with rich output

* Remove hardcoded tool counts from search example subtitles

* Clarify that review bot feedback should be evaluated on its merits

* Expand search transform docs with proper hierarchy

---------

Co-authored-by: marvin-context-protocol[bot] <225465937+marvin-context-protocol[bot]@users.noreply.github.com>
2026-02-26 22:42:38 -05:00
Manrique Vargas
c71840631e
docs: add context-aware tool factory example (#3264)
Fixes PrefectHQ/fastmcp#1841

Signed-off-by: machov <mv1742@nyu.edu>
2026-02-22 11:24:22 -05:00
Jeremiah Lowin
c1f50e49be
Add enabled field to ToolTransformConfig (#2991) 2026-01-22 17:44:38 -05:00
Jeremiah Lowin
6dba73b69d
Restructure docs: move transforms to dedicated section (#2956) 2026-01-20 00:38:35 -05:00