Signal Studio Technical Guides https://signalstudio.cc/ Evidence-first field guides for production AI engineering. en-US Tue, 25 Aug 2026 00:00:00 GMT AI helps me code faster—why am I learning less? https://signalstudio.cc/guides/ai-coding-faster-learning-less/ https://signalstudio.cc/guides/ai-coding-faster-learning-less/ A judgment-loop diagnosis for developers who are shipping faster with AI but retaining less understanding, transfer, debugging skill, and design confidence. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li Can a system prompt stop prompt injection? https://signalstudio.cc/guides/can-system-prompts-stop-prompt-injection/ https://signalstudio.cc/guides/can-system-prompts-stop-prompt-injection/ Why instruction wording cannot be the only prompt-injection control, and how to build boundaries around evidence, tools, authority, and effects. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li Can an AI agent really find root cause from OpenTelemetry data? https://signalstudio.cc/guides/can-ai-find-root-cause-from-opentelemetry/ https://signalstudio.cc/guides/can-ai-find-root-cause-from-opentelemetry/ A practical test for deciding when an AI-assisted incident investigation has enough evidence to state a root cause, a contributing factor, or only a hypothesis. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li Context, memory, and state: what is the difference? https://signalstudio.cc/guides/context-memory-and-state-differences/ https://signalstudio.cc/guides/context-memory-and-state-differences/ A production design boundary for deciding what the model sees now, what the system may remember later, and what remains authoritative workflow truth. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li GEO vs SEO: what actually changes? https://signalstudio.cc/guides/geo-vs-seo/ https://signalstudio.cc/guides/geo-vs-seo/ A responsibility matrix separating durable SEO foundations from the evidence design and answer-level observations added by generative search experiences. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li How do forward-deployed teams avoid permanent custom development? https://signalstudio.cc/guides/avoid-permanent-custom-development/ https://signalstudio.cc/guides/avoid-permanent-custom-development/ A practical escape from customer-specific code through bounded experiments, pattern thresholds, productization decisions, ownership, and deletion dates. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li How do I build a task portfolio instead of a benchmark shrine? https://signalstudio.cc/guides/build-an-agent-task-portfolio/ https://signalstudio.cc/guides/build-an-agent-task-portfolio/ A versioned portfolio method that represents task families, users, frequency, risk, difficulty, tools, environments, and changing production failures. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li How do I calculate cost per AI outcome? https://signalstudio.cc/guides/calculate-cost-per-ai-outcome/ https://signalstudio.cc/guides/calculate-cost-per-ai-outcome/ A fully loaded outcome-ledger method that includes accepted, rejected, reversed, and reviewed AI work instead of dividing one provider invoice by request count. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li How do I join traces, logs, and metrics without false correlations? https://signalstudio.cc/guides/join-traces-logs-and-metrics-safely/ https://signalstudio.cc/guides/join-traces-logs-and-metrics-safely/ A join-order and evidence worksheet for correlating OpenTelemetry signals through explicit identity, time, exemplars, topology, and change data. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li How should an AI agent tool-permission system work? https://signalstudio.cc/guides/agent-tool-permission-system/ https://signalstudio.cc/guides/agent-tool-permission-system/ A concrete authorization design for agent tools using identity, scoped capabilities, argument validation, risk tiers, confirmation, and effect receipts. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li My page is not cited by AI—where should I diagnose first? https://signalstudio.cc/guides/diagnose-why-ai-does-not-cite-a-page/ https://signalstudio.cc/guides/diagnose-why-ai-does-not-cite-a-page/ A staged diagnostic that checks access, indexing, retrieval, source selection, claim support, citation behavior, and measurement before rewriting a page. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li Ontology, taxonomy, knowledge graph, or semantic layer: which one do you need? https://signalstudio.cc/guides/ontology-taxonomy-knowledge-graph-semantic-layer/ https://signalstudio.cc/guides/ontology-taxonomy-knowledge-graph-semantic-layer/ A decision guide for choosing controlled vocabularies, relationship models, graph representations, and governed analytical meaning without buying labels. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li What belongs in an AI agent trace schema? https://signalstudio.cc/guides/agent-trace-schema/ https://signalstudio.cc/guides/agent-trace-schema/ A field-level design for tracing agent runs across models, retrieval, tools, policy decisions, outcomes, cost, and privacy boundaries. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li What five decisions should I make before writing code? https://signalstudio.cc/guides/five-decisions-before-writing-code/ https://signalstudio.cc/guides/five-decisions-before-writing-code/ A five-decision card for defining the user, outcome, constraints, failure behavior, and verification evidence before implementation begins. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li What is a forward-deployed engineer, really? https://signalstudio.cc/guides/what-is-a-forward-deployed-engineer/ https://signalstudio.cc/guides/what-is-a-forward-deployed-engineer/ A decision-oriented definition of forward-deployed engineering, including ownership, customer proximity, product feedback, and boundaries with consulting. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li When should I route to a smaller or larger model? https://signalstudio.cc/guides/route-between-small-and-large-models/ https://signalstudio.cc/guides/route-between-small-and-large-models/ A task-family routing experiment that compares model policies at equal quality, escalation, refusal, latency, cost, and serious-failure conditions. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li Why did my agent perform the same side effect twice after a timeout? https://signalstudio.cc/guides/prevent-duplicate-agent-side-effects/ https://signalstudio.cc/guides/prevent-duplicate-agent-side-effects/ A retry-safe effect protocol using operation identity, idempotency, effect receipts, reconciliation, and explicit unknown completion states. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li Why does CMDB data become stale even after a cleanup? https://signalstudio.cc/guides/why-cmdb-data-becomes-stale/ https://signalstudio.cc/guides/why-cmdb-data-becomes-stale/ A systems diagnosis of CMDB staleness covering identity, evidence, reconciliation, lifecycle events, ownership, freshness budgets, and decision feedback. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li Why is a golden dataset not enough for agent evaluation? https://signalstudio.cc/guides/golden-dataset-is-not-enough/ https://signalstudio.cc/guides/golden-dataset-is-not-enough/ A measurement-contract approach that extends reference answers with environment state, tool trajectories, permissions, budgets, uncertainty, and serious failures. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li Why the final answer is not enough to observe an AI agent https://signalstudio.cc/guides/why-the-final-answer-is-not-observability/ https://signalstudio.cc/guides/why-the-final-answer-is-not-observability/ A practical model for observing agent decisions, tool effects, evidence, cost, policy checks, and uncertainty instead of logging only the response text. Tue, 25 Aug 2026 00:00:00 GMT Leo J. Li