UI Perception Engine
Enables AI agents to perceive and interact with web interfaces by extracting a unified UI Scene Graph from live URLs, providing tools for navigation, element detection, visual analysis, and state tracking.
Emerging. No concerning findings. Grades remain capped until the project builds reputation through adoption. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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dirkknibbe
Source: Glama
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ANTHROPIC_API_KEY"": "sk-ant-..."BROWSER_HEADLESSBROWSER_VIEWPORT_HEIGHTBROWSER_VIEWPORT_WIDTHCLAUDE_API_KEYFRAME_CAPTURE_BASE_FPSFRAME_CAPTURE_BURST_DURATION_MSFRAME_CAPTURE_BURST_FPSFRAME_DIFF_THRESHOLDKV_REST_API_URLLOG_LEVELMAX_SCENE_GRAPH_HISTORYMAX_TRANSITION_HISTORYOLLAMA_MODEL"": "qwen3-vl:8b",OLLAMA_TIMEOUT_MSOLLAMA_URL"": "http://localhost:11434",OMNIPARSER_TIMEOUT_MSOMNIPARSER_URL"": "http://localhost:8100",PIXEL_DIFF_THRESHOLDUIPE_COMPONENT_INDEX_DIRUIPE_FLOW_MODEL_SHA256UIPE_FLOW_MODEL_URLVISION_PROVIDERVISION_BACKENDTool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
12/12 tools missing one or more hints — navigate (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_scene (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_affordances (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +9 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Tool inputs are validated
11/12 tool handlers declare input schemas (92%)
Declare an inputSchema with zod/joi/yup on every tool definition.
Tool handlers catch errors
Only 2/12 tool handlers wrap calls in try/catch (17%)
Wrap each tool handler body in try/catch and return a structured error response.
License file
No license file
Add a LICENSE file (MIT, Apache-2.0, etc.).
Tool test coverage
Only 3/12 tools referenced in tests (25%)
Write tests that reference each tool by name so every tool has at least one test.
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