Build Evidence Map

Turn one contested question into a portable decision artifact that shows what supports the current position, what pushes against it, and what remains unknown. Do not use a graph to decorate an answer that has not been sourced.

For a simple factual claim or a general fact-checking request, use a verification workflow such as doublecheck instead. Use this skill when the relationships between evidence, intermediate claims, trade-offs, and missing facts matter.

Workflow

1. Frame one decision. Write one falsifiable question and one provisional position. Narrow the question until a reader can identify what action or belief the map is testing.

2. Collect bounded source regions. Prefer direct observations and primary sources. Record the URL or absolute local path, publisher, publication date, retrieval date, section/page/line/timestamp locator, and a short checkable excerpt. Read references/evidence-ladder.md when source quality is disputed.

3. Atomize the reasoning. Create only four node types:

   • position: the single current verdict;
   • claim: an intermediate proposition;
   • evidence: a faithful statement of one source region;
   • unknown: a specific missing fact that could change the verdict.

4. Type every edge. Use supports, contradicts, qualifies, or missing. Add a plain-language note explaining why the source node bears on the target. Topical similarity is not support. Different scope, date, or population is not automatically a contradiction.

5. Preserve counterevidence. Do not delete contrary evidence because the provisional verdict survives it. Represent scope differences with qualifies edges.

6. Express uncertainty structurally. Do not invent confidence percentages. Add an unknown, narrow the position, or qualify a claim.

7. Write UTF-8 JSON with a .doubt.json suffix. Follow references/map-schema.md. Keep IDs short, stable, and semantic.

8. Validate fail-closed. Resolve scripts/validate.mjs relative to this SKILL.md, then run it with Node.js 18 or newer:

   node <skill-directory>/scripts/validate.mjs decision.doubt.json
   

   The bundled validator uses only Node.js built-ins and does not require npm or network access. Fix every finding before reporting success. Only say the map is valid when the command exits 0 and prints VALID followed by a 64-character receipt. A file hash, node count, JSON parse, or manual schema review is not a Doubt receipt. If deterministic validation cannot run, report that block instead of inventing success.

   Render the validated map only when the user has already installed doubt-ai@0.8.0; do not install or execute a remote package implicitly:

   doubt map decision.doubt.json --out decision.html
   

9. Verify source snapshots only with explicit network permission. The following command retrieves each recorded HTTP(S) source and fails closed if an excerpt cannot be matched:

   doubt verify decision.doubt.json \
     --out decision.verified.doubt.json
   

   Never run this command implicitly. Local file verification does not use the network. Do not write a verification object by hand or hide a mismatch.

10. Inspect the deliverable. Confirm that the question, verdict, counterevidence, unknowns, edge notes, and exact source regions remain readable. Treat JSON as the canonical editable artifact; HTML is a shareable view.

Quality gates

A finished map must satisfy all of these:

• exactly one position has incoming reasoning;
• every evidence node names one source and participates in an edge;
• every source is used and has dates, a bounded locator, and a substantive excerpt;
• every non-position node has a directed path to the position;
• the reasoning graph has no duplicate edges or directed cycles;
• contrary or qualifying evidence is present when the source set contains it;
• each decision-changing gap is an explicit unknown node;
• every edge note explains support, contradiction, qualification, or absence;
• the verdict is no broader than the evidence.

Deliver the result

Report:

• the current position in one sentence;
• the strongest counterevidence or qualification;
• the most important unresolved unknown;
• paths to the canonical JSON and any rendered HTML;
• whether deterministic validation and explicit source verification ran.

Never describe a structurally valid map as proven true. Validation establishes traceability and graph integrity; source quality and inference quality still require human review.