[SK-2195] feat(mcp): mint session tokens for a connection's MCP server by ravibits · Pull Request #221 · scalekit-inc/scalekit-sdk-python

ravibits · 2026-10-09T15:50:09Z

Description

Every AgentKit connection has its own MCP server at <environment URL>/mcp/v3/connections/<connection name>. It serves all of that connection's tools without an MCP configuration. create_session_token can now mint a token for that server: pass the new keyword-only connection_name instead of mcp_config_id.

# client.actions.mcp: returns CreateMcpSessionTokenResponse
@overload
def create_session_token(self, mcp_config_id: str, identifier: str,
                         expiry: timedelta | None = None, access_level: str | None = None): ...
@overload
def create_session_token(self, *, connection_name: str, identifier: str,
                         expiry: timedelta | None = None, access_level: str | None = None): ...

# client.mcp: same arguments, returns the raw (response, call) tuple like the rest of that client

Behaviour:

Connection token: connection_name is sent as the request's key_id, and mcp_config_id is never set. expiry and access_level are sent only when given, so the server defaults apply: 1 hour, full access.
Access level: access_level="READ_ONLY" limits the token to tools marked read-only. Other tools are left out of tools/list, and calling one returns unknown tool "<name>".
Connection name: matched without regard to case, but the token is issued for the URL built from the stored name. That URL path is case-sensitive, so connect with the name exactly as stored.
Validation, connection calls only: passing both mcp_config_id and connection_name, an empty connection_name, or a missing or empty identifier raises ValueError before any request.
Config calls: existing calls with mcp_config_id, positional or keyword, behave exactly as in v2.20.0. They send the same request, and client.actions.mcp raises the same ValueError messages.
Errors from the server:
- ScalekitNotFoundException: no active connection with that name.
- ScalekitBadRequestException: invalid input, a connection that isn't an AgentKit connection, or, depending on the environment's configuration, no active connected account for the identifier.

Usage

from datetime import timedelta

resp = client.actions.mcp.create_session_token(
    connection_name="gmail",
    identifier="user_123",
    expiry=timedelta(minutes=15),
    access_level="READ_ONLY",
)
headers = {"Authorization": f"Bearer {resp.token}"}
# connect to <environment URL>/mcp/v3/connections/gmail with these headers

Testing

make lint: passes.
tests/test_mcp_connection_session_token.py: 34 credential-free tests with mocked transport, all passing. They cover:
- both call forms on both clients;
- the request fields that are set;
- expiry and access_level forwarding;
- connection_name being keyword-only;
- invalid connection arguments;
- v2.20.0 behaviour of config calls, including pass-through on client.mcp and the exact error messages on client.actions.mcp;
- server errors propagating.
Type checking: mypy accepts every existing call form and rejects passing both targets, or a connection without an identifier.
tests/test_mcp_session_token_access_level.py and the offline suites pass.
Live integration tests were not run locally; CI's live suite runs them. tests/test_mcp.py mints READ_ONLY for a connection, expects ScalekitNotFoundException for an unknown one, and covers the positional config form.

Release

No release (skip-release). The notes wait in .changes/unreleased:

client.actions.mcp.create_session_token(connection_name=..., identifier=...) mints a session token for a connection's own MCP server (<environment URL>/mcp/v3/connections/<connection name>), which serves all of that connection's tools without an MCP configuration. Pass exactly one of mcp_config_id or the new keyword-only connection_name; expiry and access_level work for both, and access_level="READ_ONLY" limits the token to read-only tools. The URL path is case-sensitive, so connect with the connection's name exactly as stored. Existing calls with mcp_config_id, positional or keyword, are unchanged. client.mcp.create_session_token takes the same arguments and returns the raw (response, call) tuple.

Scope

Builds on [SK-2195] feat(mcp): add access_level to create_session_token #219, which adds access_level and the proto update this change needs. This branch contains [SK-2195] feat(mcp): add access_level to create_session_token #219's commit, so merge [SK-2195] feat(mcp): add access_level to create_session_token #219 first; this PR's diff then reduces to this change.
[SK-2195] feat(mcp): add access_level to create_session_token #219 still needs, before it merges:
- Its own added fragment for access_level.
- Its commit carries a session-link trailer that shouldn't be in this repo's history. Drop it from the squash message, and drop it from this PR's squash message too.
Sibling PR: [SK-2195] feat(mcp): mint session tokens for a connection's MCP server scalekit-sdk-node#241, createSessionToken({ connectionName, ... }).
Compatibility: additive. create_session_token gains a keyword-only argument; config calls are unchanged.
Not done: expires_at stays a naive UTC datetime, as before.

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* chore(release): release tool, release.toml and seeded CHANGELOG Vendored from scalekit-sdks-wrapper/tools/release. The matching workflow changes (release-checks.yml, release.yml, build.yml workflow_call) ship in a separate commit because they need a push credential with the GitHub 'workflow' scope. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017ANmBCXNdijNmAJ49zFRPv * chore(release): drive releases from scalekit-sdks-wrapper The release tool and its config now live only in the wrapper (tools/release). This repo keeps CHANGELOG.md and .changes/unreleased/ (release notes waiting for the next release). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017ANmBCXNdijNmAJ49zFRPv * ci(release): approval-gated release workflow - release.yml (workflow_dispatch, version input): validates the version against the source, the tags and CHANGELOG.md; reuses build.yml as CI; builds; waits for the 'release' environment approval; tags with the release app; publishes; creates the GitHub Release from the CHANGELOG; verifies the registry. dry_run rehearses without tagging or publishing. - build.yml: add workflow_call so the release reuses the exact PR CI. Generated by scalekit-sdks-wrapper/tools/release/templates/workflows/generate.py. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017ANmBCXNdijNmAJ49zFRPv * docs: describe how this repo's existing release workflow is started Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017ANmBCXNdijNmAJ49zFRPv * ci(release): keep the existing release workflow Restores .github/workflows as on main: releases keep using the existing workflow (or stay manual), started from scalekit-sdks-wrapper after release.py preflight; every PR already has to pass build.yml. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017ANmBCXNdijNmAJ49zFRPv * docs: describe release notes and the release workflow Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017ANmBCXNdijNmAJ49zFRPv * docs(changelog): add the latest release and simplify the header Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * docs(changelog): fix typos and defaults in imported release history Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * docs(changelog): drop leftover contributor handles, reword the import note Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude <noreply@anthropic.com>

Add create_connection_session_token to client.mcp and client.actions.mcp. It mints a session token for the MCP server of one connection, identified by connection name, with the same optional expiry and access level as create_session_token. Existing methods are unchanged. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Describe the no-active-account case as configuration-dependent, note that connection_name is matched against the stored name including case, and state that expires_at on the parsed response is a naive UTC datetime. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

The connection is matched without regard to case and the token is issued for the MCP server URL built from the stored name; only that URL is case-sensitive. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Use one example across docstrings, AGENTKIT.md and the release note, and list the bad-request cases in the AGENTKIT.md entry. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

…nnection-session-token

coderabbitai · 2026-10-09T15:50:26Z

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Walkthrough

The pull request adds MCP session-token support for connection targets and access-level options. It also updates generated protobuf types and gRPC bindings across several services, including authentication, client configuration, connected accounts, migrations, organizations, and triggers.

Changes

MCP Session Tokens

Layer / File(s)	Summary
MCP token request contract `scalekit/v1/mcp/mcp_pb2.py`, `scalekit/v1/mcp/mcp_pb2.pyi`	The token request adds `key_id` and `access_level`. Descriptor metadata documents configuration and connection token requests and access-level behavior.
MCP client and Actions methods `scalekit/mcp.py`, `scalekit/actions/actions.py`	The MCP client validates and resolves either target, builds the corresponding request, and returns a response and gRPC call. The Actions method supports configuration and keyword-only connection call forms.
MCP token validation and documentation `tests/test_mcp.py`, `AGENTKIT.md`, `.changes/unreleased/`	Tests cover target routing, access levels, expiry, validation, and error handling. Documentation describes the arguments, constraints, examples, and return values.

Generated API Updates

Layer / File(s)	Summary
AuthService request and RPC updates `Makefile`, `scalekit/v1/auth/*`	The default protobuf reference changes. AuthService adds login-request detail messages and an RPC; `GetAuthState` now accepts organization and prompt fields.
Client and connected-account configuration `scalekit/v1/clients/clients_pb2.pyi`, `scalekit/v1/connected_accounts/*`, `scalekit/v1/connections/connections_pb2.pyi`	Client declarations add IP allowlist types and fields. Connected-account and connection declarations add scope-selection fields, and generated bindings add `CreateRedirectUrl`.
Gateway annotations and update mask `scalekit/v1/gateway/*`	Gateway methods receive PREVIEW visibility annotations. `UpdateManualGatewayGroupRequest` adds an update mask, and the descriptor changes its field number.
Connected-account credential repair RPC `scalekit/v1/migrations/*`	The generated migration API adds repair request, failure, and response messages and gRPC bindings for the repair RPC.
Organization branding RPCs `scalekit/v1/organizations/*`	The generated organization API adds branding types and get/update RPC bindings.
Tool API descriptor updates `scalekit/v1/tools/tools_pb2.py`	Descriptor examples change tool names. ExecuteTool metadata documents provider-mismatch rejection before a provider request.
TriggerService generated bindings `scalekit/v1/triggers/*`	Generated trigger type declarations and gRPC bindings cover the service RPCs.

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant ActionMcp
  participant McpClient
  participant CreateMcpSessionToken
  ActionMcp->>McpClient: forward target, identifier, expiry, and access level
  McpClient->>CreateMcpSessionToken: send configuration ID or connection key ID
  CreateMcpSessionToken-->>McpClient: return token response and gRPC call
  McpClient-->>ActionMcp: return parsed response

Suggested reviewers: avinash-kamath

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✅ Passed checks (4 passed)

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Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: adding MCP session-token creation for a connection's MCP server.

Full details: Docstring Coverage

Explanation

Docstring coverage is 21.03% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 195 functions across 24 files. (2 skipped: 2 unsupported.)

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_{A rabbit checked the token trail,
Then sent a key along the rail.
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While scopes and fields lined up in scheme.
New bindings joined the SDK parade,
And tidy tests confirmed the trade.}

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Review comments at @scalekit/v1/auth/auth_pb2_grpc.py:
- Line 50: Update the GetAuthState stub’s request serialization so existing
callers passing google.protobuf.empty_pb2.Empty() remain compatible with
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📒 Files selected for processing (33)

.changes/unreleased/added-20261009-153535-mcp-connection-session-token.yaml
AGENTKIT.md
Makefile
scalekit/actions/actions.py
scalekit/mcp.py
scalekit/v1/auth/auth_pb2.py
scalekit/v1/auth/auth_pb2.pyi
scalekit/v1/auth/auth_pb2_grpc.py
scalekit/v1/clients/clients_pb2.py
scalekit/v1/clients/clients_pb2.pyi
scalekit/v1/connected_accounts/connected_accounts_pb2.py
scalekit/v1/connected_accounts/connected_accounts_pb2.pyi
scalekit/v1/connected_accounts/connected_accounts_pb2_grpc.py
scalekit/v1/connections/connections_pb2.py
scalekit/v1/connections/connections_pb2.pyi
scalekit/v1/gateway/gateway_pb2.py
scalekit/v1/gateway/gateway_pb2.pyi
scalekit/v1/mcp/mcp_pb2.py
scalekit/v1/mcp/mcp_pb2.pyi
scalekit/v1/migrations/migrations_pb2.py
scalekit/v1/migrations/migrations_pb2.pyi
scalekit/v1/migrations/migrations_pb2_grpc.py
scalekit/v1/organizations/organizations_pb2.py
scalekit/v1/organizations/organizations_pb2.pyi
scalekit/v1/organizations/organizations_pb2_grpc.py
scalekit/v1/tools/tools_pb2.py
scalekit/v1/triggers/__init__.py
scalekit/v1/triggers/triggers_pb2.py
scalekit/v1/triggers/triggers_pb2.pyi
scalekit/v1/triggers/triggers_pb2_grpc.py
tests/test_mcp.py
tests/test_mcp_connection_session_token.py
tests/test_mcp_session_token_access_level.py

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Fold the connection case into create_session_token on both McpClient and client.actions.mcp: pass exactly one of mcp_config_id or the new keyword-only connection_name (sent as key_id). Existing positional and keyword calls with mcp_config_id are unchanged. Both/neither target, a blank target or a missing identifier raise ValueError before any request. Typing overloads describe the two valid call shapes, and McpClient's return annotation now matches the (response, call) tuple it returns. Remove create_connection_session_token, which was never released. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @AGENTKIT.md:
- Line 945: Update the `client.mcp.create_session_token` summary in the API
documentation to show its actual tuple return type,
`CreateMcpSessionTokenResponse` and `grpc.Call`, consistent with the method
implementation and the example that unpacks the result.

Review comments at @scalekit/mcp.py:
- Around line 20-24: Update the annotations in _resolve_session_token_target to
remain importable on Python 3.8 and 3.9; add postponed annotation evaluation at
the top of scalekit.mcp or replace the new union annotations with compatible
typing forms.

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.changes/unreleased/added-20261009-153535-mcp-connection-session-token.yaml
AGENTKIT.md
scalekit/actions/actions.py
scalekit/mcp.py
tests/test_mcp.py
tests/test_mcp_connection_session_token.py

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Use typing.Optional and typing.Tuple instead of PEP 604 unions and built-in generics, and show client.mcp.create_session_token's tuple return type in AGENTKIT.md. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Limit the new client-side checks to the connection form of create_session_token. With mcp_config_id and no connection_name: - client.mcp builds the request from the arguments as given, as before: an empty, whitespace or None config ID and an empty identifier go to the server. A private sentinel default for mcp_config_id lets an explicit None still reach the server; only a call that passes neither mcp_config_id nor connection_name raises ValueError. - client.actions.mcp keeps its previous checks and messages ("mcp_config_id is required", "identifier is required"). With connection_name: passing mcp_config_id too, an empty connection_name, or a missing or empty identifier raises ValueError before any request; a whitespace name or identifier goes to the server. Annotations in the changed code use X | None and tuple[...] again, since the package already requires Python 3.10. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

When the environment does not require an active connected account, the server creates a pending connected account for the identifier before minting a connection session token. Say so in the create_session_token docstrings and AGENTKIT.md. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

The server reuses the identifier's existing connected account on the connection and creates a pending one only when there is none. Say so in the create_session_token docstrings and AGENTKIT.md. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ravibits · 2026-10-10T00:05:39Z

When merging: several commits on this branch end with a Claude-Session: trailer. This repository is public, so please delete those trailer lines from the squash-commit message before you confirm the merge. Keep the Co-Authored-By lines.

Generated by Claude Code

saif-at-scalekit and others added 7 commits October 9, 2026 07:08

Update the Scalekit description. (#218)

d8d7d01

docs(mcp): correct connection_name casing note

02efd1a

The connection is matched without regard to case and the token is issued for the MCP server URL built from the stored name; only that URL is case-sensitive. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs(mcp): align connection session token examples and errors

aa472d3

Use one example across docstrings, AGENTKIT.md and the release note, and list the bad-request cases in the AGENTKIT.md entry. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Merge remote-tracking branch 'origin/main' into fix/sdk-method/mcp-co…

99e2f0f

…nnection-session-token

ravibits requested review from AkshayParihar33, anujsharmask, dhawani, saif-at-scalekit and srinivaskarre-sk as code owners October 9, 2026 15:50

ravibits mentioned this pull request Oct 9, 2026

[SK-2195] feat(mcp): mint session tokens for a connection's MCP server scalekit-inc/scalekit-sdk-node#241

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ravibits added the skip-release label Oct 9, 2026 — with Claude

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claude added 4 commits October 9, 2026 20:13

ravibits changed the base branch from main to claude/inspiring-bohr-os672e October 9, 2026 21:07

ravibits merged commit a1d8b57 into claude/inspiring-bohr-os672e Oct 10, 2026
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ravibits deleted the fix/sdk-method/mcp-connection-session-token branch October 10, 2026 01:16

AkshayParihar33 mentioned this pull request Oct 10, 2026

[SK-2195] feat(mcp): add access_level to create_session_token #219

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[SK-2195] feat(mcp): mint session tokens for a connection's MCP server - #221

[SK-2195] feat(mcp): mint session tokens for a connection's MCP server#221
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