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Jishu Labs
CTO
January 20, 2026
13 min read
Featured Article
5 articles tagged “specification”
Clear tag filterA PRD states what should be built and why, precisely enough that engineers can build it without guessing. In a world where implementation is cheap, the specification became the constraint.
Acceptance criteria define the conditions under which work is considered done. Written well they end scope arguments before they start; written badly they are a second, vaguer copy of the ticket title.
Asking a model politely for JSON produces JSON most of the time, and most of the time is not a contract. How constrained decoding, schemas and validation combine into something you can build on.
When implementation is cheap and fast, the specification becomes the bottleneck and the durable artefact. What changes when the spec, not the code, is the thing you maintain.
A working MCP server in five steps — choosing what to expose, defining tools the model can actually use, handling authorisation, testing against a host, and the mistakes that make a server unusable in practice.
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