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Building a Custom Prompt Generator for CXGRD

CXGRD’s prompt generator is designed to place computed repository facts—affected files, dependencies, and risk—into coding-agent prompts without confusing context formatting with interpreting vague requests.
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A custom prompt generator can give a coding agent repository-specific facts—such as which files a change may affect—without asking a language model to invent them. CXGRD’s design separates that dependable context-building job from interpreting what a person means by an ambiguous request: templates can format analysis consistently, while the model remains better suited to turning vague intent into a concrete task.

What CXGRD’s prompt generator does

CXGRD is a TypeScript command-line tool that scans a project, builds a dependency graph, supplies architectural context and blast-radius analysis to AI assistants, and validates architecture. Its README describes a workflow using cxgrd scan, cxgrd input, cxgrd prompt, and cxgrd check. CXGRD’s GitHub README documents the commands and project workflow; it does not independently assess the quality of generated prompts.

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The generator’s central idea is straightforward: use repository analysis as the source of facts, then render selected results in a repeatable prompt structure. In an October 6, 2026 implementation post, CXGRD founder Manan Sharma describes first obtaining blast-radius results from a subgraph and then embedding them in a prompt. Sharma’s implementation post shows structured context that can include the requested change, seed files, affected files, dependency edges, symbols, architecture layers, risk, and recommendations.

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What information can be included

The example data shape distinguishes the files that anchor the proposed change from files that may be affected by it. For affected files, it can carry severity, a reason for inclusion, distance from the seed files, impact type, whether a change is required, and a suggested fix. Those details make the prompt more than a file list: they explain why an agent should pay attention to particular parts of the project.

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  • Change context: the description of the proposed work and the seed files associated with it.
  • Impact context: affected files, direct or transitive relationships, distance, severity, and reasons.
  • Architecture context: dependency edges, symbols, and architectural layers.
  • Action context: risk level, recommendations, and possible suggested fixes.

In the implementation example, the renderer omits seed files from the affected-file list, labels other files by direct or transitive relationship and distance, and includes risk and reason. It may also add an architecture-layer note and a suggested action. The point is to carry analysis CXGRD has computed into the agent’s working context in a form that can be inspected.

Deterministic context is not the same as understanding intent

A template can consistently present structured analysis, but it does not automatically understand an unclear request. Sharma uses “make login less janky” as an example of vague wording and acknowledges that an AI model can interpret such a request more effectively than a fixed template. The generator’s role is different: after the task is understood well enough to analyze, it can add facts such as likely affected files, dependencies, and risk.

This division of work is useful when a prompt needs both human intent and dependable project context. Free-form prompt writing gives a developer flexibility but may omit or inconsistently describe relevant repository findings. An AI-generated prompt can be flexible in interpreting a request, but its claims about repository structure should not be treated as facts unless grounded in project analysis. A deterministic renderer can make the structure repeatable and the included findings easier to inspect; that alone does not prove the findings are correct or current.

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Constraints and checks: proposed behavior versus documented behavior

An earlier design post proposed conditional prompt blocks based on analysis data. Examples included adding a requirement to preserve public exports for high-risk changes, applying a migration constraint when schema or migration files are involved, listing highly depended-on files as “avoid unless needed,” and asking the agent to stop and report if it needs to edit files outside an identified set. The proposal also discussed finding tests that import affected files and asking the agent to run cxgrd check. The earlier CXGRD design post presents these as design ideas.

Do not assume every proposed rule or test-selection behavior is implemented exactly as described. The later implementation post demonstrates structured affected-file details, risk, and recommendations, while the README establishes cxgrd check as a core command. Those sources do not confirm that all earlier conditional constraints shipped or show that generated prompts improve results.

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Keep repository analysis fresh

Prompt context is only as useful as the repository analysis behind it. In a follow-up discussion, Sharma says CXGRD stores blast-radius analysis in a .cg directory and that a later input command checks changed files and updates results rather than rebuilding the entire subgraph. The implementation discussion also includes a commenter’s suggestion to display graph-generation time so users can tell whether analysis may be stale. That timestamp display is a suggestion, not a confirmed feature.

For users, this makes freshness and provenance a practical consideration: before trusting an affected-file list, understand when its analysis was generated and how changes are incorporated. The available description explains incremental updates, but it does not establish a particular freshness indicator in the interface.

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How to evaluate this approach

The design offers a plausible way to make repository facts more visible and prompt structure more repeatable. Those are design motivations, not measured outcomes. The cited material provides no benchmark or independent evaluation establishing improvements in reliability, speed, testability, or cost.

Approach Potential strength Important limitation
Free-form prompt writing Flexible wording shaped by the developer’s knowledge of the task. Repository details may be omitted or described inconsistently.
AI-generated prompt Can interpret ambiguous requests more flexibly than fixed templates. Repository-specific claims need grounding in analyzed project data.
Deterministic CXGRD rendering Can consistently format selected dependency and blast-radius findings for inspection. Repeatable formatting does not establish that the analysis is correct, fresh, or more effective; no comparative measurements are reported.

The useful question is not whether a template replaces an AI model. It is whether computed project facts are clearly tied to the task, whether users can inspect their reasons and freshness, and whether risk-based constraints and verification steps are actually implemented and effective.

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642 Things to Write About: (Guided Journal, Creative Writing, Writing Prompt Journal)
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Author: SanFranciscoWriters'Grotto.; Publisher: ChronicleBooks; Pages: 304; Publication Date: 2012
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