The Morning Flash Started Answering Differently, Your Prompt Is Not the First Thing to Check
When output length or format shifts although you never touched the model ID, compare the model you requested with the model that actually answered. A small three-prompt script logs modelVersion on every run, followed by the order I use to narrow down the cause.
The Day /models Returns 200 but generateContent Returns 403 — Decide Your Triage Order Before It Happens
A triage order for the case where listing models succeeds with 200 but generation fails with 403 permission_denied. Includes a small diagnostic script that checks key, project, and billing in turn, why you should not retry a 403, and how to assemble what support needs.
When Your config Raises "Extra inputs are not permitted", Check the Spelling of Every Key
If a google-genai call fails with a pydantic ValidationError (extra_forbidden) the moment you pass a config, it is almost always a one-letter typo. Here is the output I reproduced, a small function that checks keys before the call, and how to tell why response.text came back as None.
When a Deprecation Has No Shutdown Date: Re-Picking an Image Model on Three Conditions
gemini-nano-banana-2.1 went GA on October 6, and gemini-3.1-flash-image was deprecated with no shutdown date. Here is a table and a short script for choosing a replacement by resolution, reference images, and search grounding.
I Stopped Asking Gemini 'Is This Right?' and Started Hiding My Answer Instead
Ask Gemini to confirm a label you already chose and it tends to agree. Here is why I compared three ways of asking, chose blind re-classification, how my answer still leaked in, and the routing code that sends only disagreements to a human.
When Function Calls Turn Into Plain Text, Suspect the Property Names in Your Tool Declarations
A record of chasing MALFORMED_FUNCTION_CALL after output limits and schema conflicts were ruled out, bisecting nine tool declarations down to one property name, and adding a linter that stops bad names before they ship.
The color label Gemini returned for the same wallpaper changed — and the model was not the reason
I counted color-label agreement across five ways of exporting the same wallpaper. Stripping the ICC profile was the worst of them. Here is how I pin the color space down before asking, and how I check the answers against a number I compute myself.
The approval rules I had written never matched once — auditing my Gemini CLI policies
A deny rule I trusted for half a year had never matched. The pattern was tested against a JSON string, the folder I kept my rules in is not read, and ask_user turns into deny the moment nobody is watching. Here is the audit, and the script I wrote to keep doing it.
gemini-2.5-flash-image stops on October 2, and the replacement the table names retired in June
gemini-2.5-flash-image shuts down on October 2, 2026, but the recommended replacement listed in the official table, gemini-3.1-flash-image-preview, was already retired on June 25. Here is the script I wrote to follow replacement chains to their end, and what it found across every row of the table.
The day Lyria 3.5 landed, I changed how my audio folders are laid out
When Lyria 3.5 brought full-length generation, my generated takes were sitting in the same folder as the tracks I had chosen by hand. Here is the forty-line ledger gate that draws the line by hash, not by filename.
Screen Loop Seam Clicks With Numbers Before You Hand the Audio to Gemini
An ambient loop that clicks only at the wrap point. Here is the numeric prescreen I run before sending anything to audio understanding, why an absolute threshold fails, and how AAC encoding quietly rebuilt the seam I had just repaired.
Your Spreadsheet Breaks Before Gemini Ever Sees It
Merged cells and two-row headers quietly strip rows of their keys during extraction, long before the model reads anything. Here is what gets lost, measured, plus the Python that flattens the table and catches the total row.