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docs: add v3.0.0rc1 section to v3-features tracking (#3145)

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Jeremiah Lowin 2026-02-11 10:16:54 -05:00 • committed by GitHub
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docs/development/v3-notes/v3-features.mdx
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@ -4,6 +4,72 @@ title: v3.0 Feature Tracking
This document tracks major features in FastMCP v3.0 for release notes preparation.
## 3.0.0rc1
### Concurrent Tool Execution in Sampling
When an LLM returns multiple tool calls in a single sampling response, they can now be executed concurrently ([#3022](https://github.com/jlowin/fastmcp/pull/3022)). Default behavior remains sequential; opt in with `tool_concurrency`. Tools can declare `sequential=True` to force sequential execution even when concurrency is enabled.
```python
result = await context.sample(
messages="Fetch weather for NYC and LA",
tools=[fetch_weather],
tool_concurrency=0, # Unlimited parallel execution
)
```
### OpenAPI `validate_output` Option
`OpenAPIProvider` and `FastMCP.from_openapi()` now accept `validate_output=False` to skip output schema validation ([#3134](https://github.com/jlowin/fastmcp/pull/3134)). Useful when backends don't conform to their own OpenAPI response schemas — structured JSON still flows through, only the strict schema checking is disabled.
```python
mcp = FastMCP.from_openapi(
openapi_spec=spec,
client=client,
validate_output=False,
)
```
### Auth Token Injection and Azure OBO Dependencies
New dependency injection for accessing the authenticated user's token directly in tool parameters ([#2918](https://github.com/jlowin/fastmcp/pull/2918)). Works with any auth provider.
```python
from fastmcp.server.dependencies import CurrentAccessToken, TokenClaim
from fastmcp.server.auth import AccessToken
@mcp.tool()
async def my_tool(
token: AccessToken = CurrentAccessToken,
user_id: str = TokenClaim("oid"),
): ...
```
For Azure/Entra, the new `fastmcp[azure]` extra adds `EntraOBOToken` and `MSALApp` dependencies that handle the On-Behalf-Of token exchange declaratively:
```python
from fastmcp.server.auth.providers.azure import EntraOBOToken
@mcp.tool()
async def get_emails(
graph_token: str = EntraOBOToken(["https://graph.microsoft.com/Mail.Read"]),
):
# graph_token is ready — OBO exchange happened automatically
...
```
### `generate-cli` Agent Skill Generation
`fastmcp generate-cli` now produces a `SKILL.md` alongside the CLI script ([#3115](https://github.com/jlowin/fastmcp/pull/3115)) — a Claude Code agent skill with pre-computed invocation syntax for every tool. Agents reading the skill can call tools immediately without running `--help`. On by default; pass `--no-skill` to opt out.
### Background Task Notification Queue
Background tasks now use a distributed Redis notification queue for reliable delivery ([#2906](https://github.com/jlowin/fastmcp/pull/2906)). Elicitation switches from polling to BLPOP (single blocking call instead of ~7,200 round-trips/hour), and notification delivery retries up to 3x with TTL-based expiration.
### Breaking: `ui=` Renamed to `app=`
The MCP Apps decorator parameter has been renamed from `ui=ToolUI(...)` / `ui=ResourceUI(...)` to `app=AppConfig(...)` ([#3117](https://github.com/jlowin/fastmcp/pull/3117)). `ToolUI` and `ResourceUI` are consolidated into a single `AppConfig` class. Wire format is unchanged. See the MCP Apps section under beta2 for full details.
## 3.0.0beta2
### CLI: `fastmcp list` and `fastmcp call`