# Verify Before Claim > Use when an agent is about to claim completion, correctness, safety, publication, deployment, or any consequential external fact. - **Type:** Skill - **Install:** `agentstack add skill-mark393295827-third-brain-v7-skills-verify-before-claim` - **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior - **Seller:** [Mark393295827](https://agentstack.voostack.com/s/mark393295827) - **Installs:** 0 - **Category:** [Productivity](https://agentstack.voostack.com/c/productivity) - **Latest version:** 0.1.0 - **License:** MIT - **Upstream author:** [Mark393295827](https://github.com/Mark393295827) - **Source:** https://github.com/Mark393295827/third-brain-v7-skills/tree/main/skills/verify-before-claim - **Website:** https://github.com/Mark393295827/third-brain-v5-skills/tree/master ## Install ```sh agentstack add skill-mark393295827-third-brain-v7-skills-verify-before-claim ``` Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent. ## About # Verify Before Claim One falsifiable claim, its artifact or system, risk, expected result, permissions, and available checks. A scoped claim decision with fresh evidence, residual risk, approval, and rollback status. The cheapest direct check after the final material change supports the exact allowed wording. Producing the artifact, inferring success from effort, or widening a claim beyond checked evidence. No evidence, no claim. Match the check to the exact claim, use fresh evidence, and keep execution authority separate from approval authority for consequential actions. ## Usage Template Provide: proposed claim, artifact or system, risk level, available checks, expected result, permissions, and rollback path. ## Workflow 1. Rewrite the proposed statement as one falsifiable claim. 2. Classify risk: low, material, or consequential. 3. Select the cheapest check that directly tests the claim. 4. Record expected signal, time boundary, and acceptable evidence. If the artifact, expected behavior, or verification method is missing, return `NEEDS_INPUT`. If only indirect evidence exists, return `INSUFFICIENT_EVIDENCE` or narrow the claim; never fill the gap with confidence language. Run the selected check after the final material change. Examples: targeted test, lint, build, link check, read-after-write, diff inspection, source comparison, dashboard query, or deployment health check. Capture command/query, timestamp, scope, exit status, and key output. For material or consequential claims, obtain independent verification from a separate check, reviewer, or evidence source. Require human approval before irreversible publication, deployment, spending, deletion, credential use, or policy change. Confirm the rollback path before execution. For Graph claims, verify static contract integrity, every required node and join receipt, terminal acceptance, budgets, permission/compensation state, and checkpoint identity. Passing nodes do not prove the end-to-end graph. Compare observed versus expected result. Decide `supported`, `partially_supported`, `unsupported`, or `blocked`. Check scope: passing one test cannot prove the full suite; a successful write cannot prove link integrity. State residual risk and evidence age. `max_attempts: 2`. Retry only after diagnosing the failure and changing input, tool, scope, or strategy. Stop on repeated signature or `NO_PROGRESS`; never rerun an unchanged check to manufacture confidence. Persist `{run_id, status, attempt, budget, evidence, unknowns, last_error, next_action}` plus claim, risk, check specification, expected/observed results, approval receipt, and rollback readiness. Append verification events so evidence age remains visible. ## Failure Protocol - `NEEDS_INPUT`: the claim or expected result is ambiguous; ask one discriminating probe. - `INSUFFICIENT_EVIDENCE`: no direct check supports the requested scope; narrow or withhold the claim. - `BLOCKED_PERMISSION`: approval or access is absent; do not perform the action. - `VERIFY_FAILED`: observed evidence contradicts the claim; report failure and recovery. - `NO_PROGRESS`: the same verification signature fails twice; stop and escalate. - `BUDGET_STOP`: verification budget is exhausted; preserve evidence and do not claim completion. `max_attempts: 2`. ## Output Contract Return `status`, `result` (claim decision and allowed wording), `evidence` (fresh receipts), `unknowns` (including residual risk), and `next_action` (repair, approval, rollback, or stop). ## Edge Cases - Tests passed before a final edit: evidence is stale; rerun the relevant checks after the edit. - Every Graph node is green but the reduce join lacks one declared input: withhold graph completion and return `VERIFY_FAILED`. - An authoritative page is unavailable: report `INSUFFICIENT_EVIDENCE`; do not substitute an uncited recollection for the external fact. ## Success Metrics - Every material completion claim has a fresh, scope-matched receipt. - Consequential actions have independent verification, approval, and rollback readiness. - Failed checks change the claim or execution state immediately. ## Quality Gates - [ ] Claim, expected result, and check scope match. - [ ] Evidence was produced after the last material change. - [ ] Partial checks lead to partial wording. - [ ] Approval and rollback controls match risk. ## Source & license This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code. - **Author:** [Mark393295827](https://github.com/Mark393295827) - **Source:** [Mark393295827/third-brain-v7-skills](https://github.com/Mark393295827/third-brain-v7-skills) - **License:** MIT - **Homepage:** https://github.com/Mark393295827/third-brain-v5-skills/tree/master Install and usage instructions live in the source repository linked above. ## Pricing - **Free** — Free ## Security capabilities Automated source analysis of v0.1.0 — what this tool can access: - **Network access:** no - **Filesystem access:** no - **Shell / process execution:** no - **Environment & secrets:** no - **Dynamic code execution:** no *"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.* ## Versions - **0.1.0** — security scan: passed — Imported from the upstream source. ## Links - Listing page: https://agentstack.voostack.com/l/skill-mark393295827-third-brain-v7-skills-verify-before-claim - Seller: https://agentstack.voostack.com/s/mark393295827 - Browse the marketplace: https://agentstack.voostack.com/browse --- Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.