Add agent instructions - #544
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Add AGENTS.md as the single place describing how to work in this repository: layout, the build/test/lint commands, and the constraints that are easy to violate without noticing. Three of those are worth calling out because they are not visible from the code alone. The fixtures under test/static and test/validators are byte-sensitive, since canonicalization and digests depend on exact bytes, so formatting them silently invalidates signatures. The supported Node floor comes from `engines` plus the CI matrix, and because npm treats a package's `engines` as advisory rather than binding, tooling has to be run on the oldest supported version to know whether it works there. Anything re-exported from src/index.ts is semver-bound public API, while devDependency and CI changes are not. CLAUDE.md only points at AGENTS.md, via an @-import so the content is actually loaded, so that guidance lives in one file rather than drifting between two. Seeded from the AGENTS.md drafted on the `deps` branch. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Add two sections capturing decisions that are visible in the code but nowhere written down. Tests: the suite exists to pin down attack vectors and spec/interop behavior, not to cover the code. Internal implementation details are explicitly out of scope, since tests that restate the code catch nothing and make refactoring expensive. Points at the self-reference prevention specs as the model for the first kind and the SAML/WS-Fed/Java fixtures for the second. API design: prefer removing footguns over adding convenience, because a default that makes a security decision on the caller's behalf hands them the consequence without the choice. This is already how the library behaves; the section just names the pattern and cites the existing examples: signatureAlgorithm and digestAlgorithm throw rather than default, getCertFromKeyInfo defaults to SignedXml.noop rather than trusting a certificate the document supplied, and HMAC stays off until enableHMAC() is called. Requiring a decision only works if the options are written down, so it also asks for them to be documented in README. Drops the "add a test for any behavior change" bullet from Conventions, which the Tests section now states more precisely. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Agents habitually narrate what code does, which duplicates something the code already says and goes stale as soon as the line beneath it changes. Write the rule down: code describes itself, and comments cover only what it cannot say — why, not what or how. Uses the constant-time comparison in src/signature-algorithms.ts as the model, since its comments are the good kind: two lines giving the reason the comparison must be constant-time and the issue it came from, and one flagging that timingSafeEqual throws on a length mismatch, which the call site does not reveal. Also carves out JSDoc on exported API, which documents the contract for consumers rather than narrating the implementation, so the rule does not get over-applied to it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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In `@AGENTS.md`:
- Line 115: Update the fenced code block near the affected documentation section
to include an appropriate language identifier, such as ts, so markdownlint MD040
passes; leave the block’s contents unchanged.
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Drop the pointers to a specific describe block and spec file. They were the clearest illustration available, but a test that gets renamed or moved turns the guidance into a dead reference, and the point stands without them. Replace them by stating the shape of a test outright, since that is what an agent needs in order to decide whether to write one at all. A test feeds the library XML plus a configuration a JavaScript caller could actually pass, then asserts the library does not return improper data (spec compliance, interoperability, best practice) and does not report something as secure or trusted when it is not (the attack-vector case). The configuration point is the one most easily missed: the types only protect TypeScript users, so anything reachable from plain JavaScript is reachable in production regardless of what tsc would have said. Tests should therefore be written against what JavaScript allows, casting past the type error where that is the whole point. Notes to use `as` rather than `!`, since no-non-null-assertion is an error and applies to test files too. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Expands on the existing commenting standard to provide more specific guidance. Clarifies that comments should explicitly link to issues or specs, and emphasizes keeping comments concise and "DRY" by citing rather than quoting. Also defines the appropriate use of `/** */` JSDoc blocks, reserving them for exported API contracts and discouraging their use on internal code to avoid implying non-existent contracts.
Clarifies the process for validating bug fixes by requiring observation of the test failure for the reported reason. Stresses that a regression test is only meaningful if its failure is confirmed, and that branches reproducing a bug should remain red until the fix is proven.
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