elphamale
11a9dcf567
feat(mcp): migrate to the mcp 2.x SDK
...
mcp 2.0.0 implements MCP revision 2026-07-28 and makes three breaking
changes Hermes sits on top of: `mcp.server.fastmcp` is gone, every model
field is renamed to snake_case (camelCase survives only as a
serialization alias, which pydantic does not expose to attribute
access), and the SDK's own HTTP stack moved from `httpx` to `httpx2`.
Bump the pin across the dev/mcp/computer-use extras and port the tree:
- `mcp_serve.py` and `agent/transports/hermes_tools_mcp_server.py` move
from `FastMCP` to `mcp.server.MCPServer`, which has the same
decorator/add_tool surface. The hermes-tools server already
synthesised `__signature__` from Hermes' JSON Schema, which is exactly
what 2.0's `add_tool` reads.
- SDK model reads go through `mcp_field(obj, snake, camel)`, which reads
both spellings. A single-spelling read fails *silently* on the other
generation — empty tool schemas, dropped structured content, tool
results vanishing from sampling conversations — and `mcp` is an
optional extra users install at their own version.
- `sdk_httpx()` resolves the httpx flavour from the SDK's own transport
module, so objects handed to `streamable_http_client`, the `sse_client`
factory, and the OAuth metadata helpers come from the module the
installed SDK actually imports.
- HTTP support is gated on either streamable-HTTP entry point, not just
the deprecated alias 2.0 removed.
- OAuth: `OAuthClientProvider` lost its `timeout` argument (the
configured `oauth.timeout` now bounds the callback waiter's own poll
loop, where the browser round-trip was always awaited), and
`callback_handler` must return `AuthorizationCodeResult` rather than a
tuple. 2.0 also validates the RFC 9207 `iss` parameter, so the
callback handler and paste fallback capture it.
`mcp`/`mcp-types` 2.0.0 are inside the 14-day `exclude-newer` window, so
two narrow `exclude-newer-package` entries unblock `uv lock`, annotated
for removal on or after 2026-08-11. `httpx2` needs no exemption: 2.7.0 is
already outside the window and satisfies mcp's floor.
Refs #69931
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com >
2026-08-16 23:26:10 -07:00
..
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