docs: add missing image alt text (2026-03-31)

[ekline]

Image alt text audit — 2026-03-31

Total images scanned: 525 across 71 documentation files
Images with empty alt text found: 314 (60%)
Images fixed in this PR: 20 (batch limit per run)
Remaining to fix: 294

Changes by file

File	Images fixed	Alt text added
flows/quick-start-guide.md	7	See table below
flows/debugging-and-troubleshooting.md	6	See table below
ucl-unified-context-layer/getting-started/about-unified-context-layer/embedding-ucl-onto-your-ai-agent.md	7	See table below

Alt text details

File	Image	Alt text added
quick-start-guide.md	part1.gif	Animated demo of creating a new flow by clicking Flows in the menu, then Create Flows, and naming the flow
quick-start-guide.md	part 2 connectors.gif	Animated demo of adding a Slack connector step by selecting Connection tab, choosing Slack, and picking sendMessage
quick-start-guide.md	slack app connector.png	Fastn UCL app in Slack workspace showing MCP Gateway description, key capabilities, and getting started steps
quick-start-guide.md	slack channel id.png	Slack channel details dialog with the Channel ID highlighted at the bottom in a red box
quick-start-guide.md	data mapping.png	Flow builder with data mapping panel open showing channel ID and message text fields mapped to incoming request data
quick-start-guide.md	test success.gif	Animated demo of running a flow test with JSON input and receiving a successful Slack message
quick-start-guide.md	api key.gif	Animated demo of deploying the flow and locating the API key in Settings
debugging-and-troubleshooting.md	test button fastn flows.gif	Animated demo showing the Test button location in the top-right corner of the flow builder
debugging-and-troubleshooting.md	error fastn flowes right pop up.png	Flow builder showing a failed step highlighted in red with error details and JSON output in the right panel
debugging-and-troubleshooting.md	logs.gif	Animated demo of navigating to the Logs page from the left sidebar to view flow execution history
debugging-and-troubleshooting.md	logger alt fastn flows.gif	Animated demo of adding a Logger step from the Flow Control section in the step picker
debugging-and-troubleshooting.md	logger fastn flows.gif	Animated demo of dragging a Logger step from the search panel onto the flow canvas
debugging-and-troubleshooting.md	logger details .png	Flow builder showing Logger step configuration and test output with LogOutput highlighted in the bottom panel
embedding-ucl-onto-your-ai-agent.md	image (6) (1).png	GitHub repository page for embedded-multitenant-ai-assistant with Code dropdown showing Clone and Download ZIP options
embedding-ucl-onto-your-ai-agent.md	image (303).png	VS Code editor showing the .env file with OPENAI_API_KEY and NEXT_PUBLIC_FASTN_MCP_SERVER_URL placeholder variables
embedding-ucl-onto-your-ai-agent.md	image (600).png	UCL Embed page showing steps to clone the repo, generate an OpenAI API key, and set up environment variables with MCP server URL
embedding-ucl-onto-your-ai-agent.md	image (14) (1).png	Demo app with AI Assistant chat showing a sent email confirmation and Available Apps panel with Gmail and Google Docs connected
embedding-ucl-onto-your-ai-agent.md	image (15) (1).png	Demo app Tools tab listing available actions including createDoc, updateDoc, getDoc, getDocs, sendMail, and getMessages
embedding-ucl-onto-your-ai-agent.md	image (431).png	GitHub repository Codespaces tab with the Create codespace on main button
embedding-ucl-onto-your-ai-agent.md	image (5) (1).png	GitHub Codespaces editor showing the .env file with environment variable placeholders for API key and MCP server URL

Images that could not be accessed

None — all 20 images were visually inspected to generate accurate, context-aware alt text.

Notes

• This PR fixes the first 20 of 314 images with empty alt text, prioritizing high-visibility onboarding and tutorial pages.
• Run the alt text audit command again to fix the next batch of 20.
• Files with the most remaining empty alt text: setting-up-a-redshift-to-gcs-migration-flow.md (37), setting-up-a-google-drive-to-gcs-migration-flow.md (31), data-mapping-in-flows.md (16).