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Why distinguish your project’s instructions from a foreign project’s?
An AGENTS.md file can define how an agent should work in a repository. The key design question is whether that repository owns the instructions or merely contains a file the runtime encountered elsewhere. Bruña’s article argues that a project’s own contract should be available whole, while a foreign contract should have a visible budget so it cannot consume unbounded prompt context.
In Bruña’s description, APC is the portable context layer: project-owned guidance lives in AGENTS.md and defined .apc/ files. APX is the runtime and tooling layer that assembles those files with local runtime state. These are the article’s descriptions of the projects, rather than independently confirmed documentation. Read the article on DEV Community.
What does the article say APX does?
Bruña summarizes the ownership rule this way: “The practical rule is simple: APX reads the AGENTS.md for the project it is running inside in full. A foreign project’s file has a configurable budget.” The following figures and behaviors are reported by the article; they should not be treated as verified runtime behavior or a cross-tool standard.
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Own-project instructions
The article says APX reads the AGENTS.md for the project in which it is running in full. Its central recommendation is that the runtime should not silently truncate the project’s own instruction contract.
Foreign-project instructions
The article reports a default budget of 24,000 characters for a foreign project’s contract. It says the setting super_agent.project_agents_max_chars changes the budget when set to a positive value, and that setting it to 0 disables the cap. The 24,000-character value is a reported APX default, not a universal best practice or an independently measured limit.
When a foreign contract exceeds its budget
According to the article, APX truncates at a line boundary, tells the agent that truncation occurred, reports how much content was omitted, and instructs the agent to read the file before relying on instructions that were not included. The disclosure matters: without it, an agent could mistake a partial contract for the complete set of rules.
How should a runtime handle truncation?
If a runtime must shorten foreign context, the article’s approach offers three practical safeguards: preserve complete lines, explicitly flag the omission, and identify its amount. A message about truncation is not a substitute for the missing content; it tells the agent that the context it received is incomplete and that it should consult the file before relying on unseen instructions.
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What should developers verify in their own runtime?
The article proposes an ownership distinction, not a product comparison or validated benchmark. When reviewing an implementation, check the following behaviors directly:
- Does the runtime distinguish instructions belonging to the current project from those found in a foreign project?
- Are own-project instructions protected from silent truncation?
- Can the foreign-context budget be configured?
- Does shortening preserve line boundaries?
- Does the runtime clearly disclose that content was omitted and how much?
These checks are review questions drawn from the article’s recommendations. The article does not establish how other runtimes behave or show comparative test results, so its APX figure should not be used as a settled limit for all coding agents.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What about nested AGENTS.md files in a monorepo?
A DEV Community commenter raises an unresolved case: when a runtime uses the working directory to decide what counts as “own,” a monorepo may contain several nested AGENTS.md files. Their instructions may overlap or conflict. The article does not define a resolution rule.
For implementation review, determine how the runtime identifies applicable files—for example, whether it follows a nearest-ancestor or deepest-match rule—and document how overlapping instructions are handled. Those are questions to settle for a specific runtime, not rules established by Bruña’s article.
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