[Gintm]

Why

py#90 made view=summary the default for agents on posts_list_posts, and the API rejects fields and view=summary together (Send either fields or view=summary, not both, 400). Since py#90 deployed (Nov 12, ~13:21 UTC) the MCP's GET /v1/posts 400 rate went from 0.1-0.4% to 19-30% (Worker, SJC, late-python-sdk): 693 failed calls from 78 sessions in 70 minutes (Axiom zernio-mcp). Reproduced through the hosted MCP.

What

• The generator leaves the default view out of the request whenever the operation has fields and the agent set it (view=None if fields else view). Only listPosts has both today.
• Regenerated posts_list_posts: the call and one sentence of its description change.
• Tests drive the real tool: with fields no view is sent; without it view=summary still is. The first fails on develop.

🤖 Generated with Claude Code

[Gintm]

Review (code-review high --fix)

Finding	Result
fields="" is falsy, so view=summary was still sent next to an empty fields	Fixed: an empty fields is not sent (fields or None), test added
An explicit view=summary with fields is now dropped instead of answered with 400	Skipped: the agent gets the projection it asked for and saves a turn; the description says view is not sent with fields
The conflict could be resolved in the API (fields wins)	Skipped: only the MCP defaults to summary; direct API callers that send both chose both

QA

Check	Result
Reproduced on the hosted MCP: posts_list_posts with fields	400 Send either fields or view=summary, not both
Patched tool, real MCP server, mocked API: with fields	no view in the request
Without fields	view=summary still sent
New test on develop	fails (proves it covers the bug)
Full suite	1,802 passed

Metrics

Metric	Before	Expected after
MCP GET /v1/posts 400 rate (Worker, SJC, late-python-sdk)	0.1-0.4% until Nov 12 12:00, then 19-30%	back to ~0.2%
posts_list_posts errors in zernio-mcp	693 / 70 min, 78 sessions	~0

Post-deploy check: rerun posts_list_posts with fields on the hosted MCP, and the 3 h Worker 400 rate query for GET /v1/posts; control: GET /v1/posts from non-MCP clients.