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# AGENTS.md Working rules for anyone, human or agent, writing code in this repository. ## What this is Mistri (مستری) is an agent harness for Ruby applications: Anthropic, OpenAI, and Gemini, frontier-deep, no terminal UI. The gem owns mechanism; the host application owns policy. Every feature, dependency, and comment must earn its place. ## Hard quality gates (every commit) 1. `bundle exec rake test` passes. Tests are hermetic by default: no network, no keys. 2. `bundle exec rubocop` is clean. A cop disable carries a one-line reason. 3. New behavior ships with its tests in the same commit. 4. The gemspec declares zero runtime dependencies. A new dependency is a design decision with written justification, never a convenience. 5. Streaming paths never buffer a whole response. A change on the hot path (request build, SSE read, event emission) states its latency impact. 6. A public API change updates the CHANGELOG Unreleased section in the same commit. 7. `# frozen_string_literal: true` heads every Ruby file. 8. CI is green on main, always. Nothing merges red. ## Comments Comment the WHY the code cannot say: a constraint, a provider quirk, a deliberate trade-off. Never narrate what the next line does; a comment on a self-explanatory method is noise. One lead sentence on each class or module. If a method needs a comment to be understood, try a better name first. ASCII hyphens only; no em or en dashes anywhere. ## Tests Four rings: 1. Hermetic (default, CI): Minitest, the fake provider, recorded wire fixtures. 2. Differential: where behavior must match truffle-rb (schema emission, partial JSON, SSE framing), assert both against the same inputs. 3. Live (`MISTRI_LIVE=1 bundle exec rake test`): real provider calls. Keys load from `.env.development.local`, which is gitignored and never committed. 4. End to end: a demo application drives the full loop in a real browser before a release. ## Commits Plain sentence case, atomic, present tense: "Add the streaming event union". No ticket references, no Co-Authored-By, no emojis. ## Releases Semver from 0.x: patch for fixes, minor for features. Every release: CHANGELOG entry, tag `vX.Y.Z`, `gem build`, `gem push`. MFA becomes mandatory on the publishing account before 0.1.0; the Gemspec/RequireMFA cop turns on at the same time. ## Review Every phase gets an adversarial review before it merges: correctness, API design, latency, and public-gem polish. Findings are fixed or rejected with a stated reason, never dropped.