diff --git a/src/agents/prometheus-prompt.test.ts b/src/agents/prometheus-prompt.test.ts
index d1e6b87f8..76afadaac 100644
--- a/src/agents/prometheus-prompt.test.ts
+++ b/src/agents/prometheus-prompt.test.ts
@@ -85,6 +85,141 @@ describe("PROMETHEUS_SYSTEM_PROMPT zero human intervention", () => {
   })
 })
 
+describe("PROMETHEUS_SYSTEM_PROMPT spec-driven framework awareness", () => {
+  test("should contain openspec/ detection pattern", () => {
+    //#given
+    const prompt = PROMETHEUS_SYSTEM_PROMPT
+
+    //#when / #then
+    expect(prompt).toContain("openspec/")
+  })
+
+  test("should contain .specify/ detection pattern for Spec Kit (not .spec-kit/)", () => {
+    //#given
+    const prompt = PROMETHEUS_SYSTEM_PROMPT
+
+    //#when
+    const hasCorrectPattern = prompt.includes(".specify/")
+    const hasWrongPattern = prompt.includes(".spec-kit/")
+
+    //#then
+    expect(hasCorrectPattern).toBe(true)
+    expect(hasWrongPattern).toBe(false)
+  })
+
+  test("should contain OpenSpec command references", () => {
+    //#given
+    const prompt = PROMETHEUS_SYSTEM_PROMPT
+
+    //#when / #then
+    expect(prompt).toContain("/opsx:propose")
+    expect(prompt).toContain("specify spec")
+  })
+
+  test("should NOT contain wrong BMAD detection pattern", () => {
+    //#given
+    const prompt = PROMETHEUS_SYSTEM_PROMPT
+
+    //#when / #then
+    expect(prompt).not.toContain(".bmad/")
+  })
+
+  test("should contain spec-driven or spec-aware terminology", () => {
+    //#given
+    const prompt = PROMETHEUS_SYSTEM_PROMPT
+
+    //#when / #then
+    expect(prompt.toLowerCase()).toMatch(/spec.driven|spec.aware/)
+  })
+})
+
+describe("PROMETHEUS_SYSTEM_PROMPT spec-driven intent type", () => {
+  test("should contain Spec-Driven as an intent type", () => {
+    //#given
+    const prompt = PROMETHEUS_SYSTEM_PROMPT
+
+    //#when / #then
+    expect(prompt).toContain("Spec-Driven")
+  })
+
+  test("should preserve all original intent types unchanged", () => {
+    //#given
+    const prompt = PROMETHEUS_SYSTEM_PROMPT
+
+    //#when
+    const originalIntents = [
+      "Trivial/Simple",
+      "Refactoring",
+      "Build from Scratch",
+      "Mid-sized Task",
+      "Collaborative",
+      "Architecture",
+      "Research",
+    ]
+
+    //#then
+    for (const intent of originalIntents) {
+      expect(prompt).toContain(intent)
+    }
+  })
+
+  test("should contain spec-first focus description for Spec-Driven intent", () => {
+    //#given
+    const prompt = PROMETHEUS_SYSTEM_PROMPT
+
+    //#when / #then
+    expect(prompt.toLowerCase()).toContain("spec-first")
+  })
+})
+
+describe("PROMETHEUS_SYSTEM_PROMPT spec compliance section", () => {
+  test("should contain Spec Framework Integration section header", () => {
+    //#given
+    const prompt = PROMETHEUS_SYSTEM_PROMPT
+
+    //#when / #then
+    expect(prompt).toContain("Spec Framework Integration")
+  })
+
+  test("should mark spec section as conditional (not mandatory)", () => {
+    //#given
+    const prompt = PROMETHEUS_SYSTEM_PROMPT
+
+    //#when
+    const lowerPrompt = prompt.toLowerCase()
+
+    //#then
+    const hasIfDetected = lowerPrompt.includes("if detected")
+    const hasOmitNote = lowerPrompt.includes("omit this section")
+    expect(hasIfDetected || hasOmitNote).toBe(true)
+  })
+
+  test("should contain spec framework section (case-insensitive)", () => {
+    //#given
+    const prompt = PROMETHEUS_SYSTEM_PROMPT
+
+    //#when / #then
+    expect(prompt.toLowerCase()).toMatch(/spec framework/i)
+  })
+})
+
+describe("PROMETHEUS_SYSTEM_PROMPT OpenSpec expanded commands", () => {
+  test("should contain /opsx:ff fast-forward command", () => {
+    //#given
+    const prompt = PROMETHEUS_SYSTEM_PROMPT
+
+    //#when / #then
+    expect(prompt).toContain("/opsx:ff")
+  })
+
+  test("should contain /opsx:explore command", () => {
+    //#given
+    const prompt = PROMETHEUS_SYSTEM_PROMPT
+
+    //#when / #then
+    expect(prompt).toContain("/opsx:explore")
+  })
+
 describe("Prometheus prompts anti-duplication coverage", () => {
   test("all variants should include anti-duplication rules for delegated exploration", () => {
     // given
diff --git a/src/agents/prometheus/gemini.ts b/src/agents/prometheus/gemini.ts
index 1e1e2acb8..8535026f0 100644
--- a/src/agents/prometheus/gemini.ts
+++ b/src/agents/prometheus/gemini.ts
@@ -139,6 +139,14 @@ This is not optional. Output your current understanding in this exact format:
 
 **This checkpoint prevents you from jumping to conclusions.** You MUST write this out before asking the user anything.
 
+### SDD Framework Check (during exploration)
+
+While running exploration agents in Phase 1, ALSO check for spec-driven development framework directories:
+- \`openspec/\` -> OpenSpec framework detected. Read: \`openspec/specs/*/spec.md\`, \`openspec/changes/*/proposal.md\`. Shorten interview — specs answer discovery questions.
+- \`.specify/\` -> Spec Kit framework detected. Read: \`.specify/constitution.md\`, \`.specify/specs/*.md\`. Pre-fill clearance from spec content.
+
+If found: announce detection, treat this as **Spec-Driven** intent, reference spec files in plan tasks, and suggest framework commands in TODO sections (\`/opsx:propose\`, \`/opsx:apply\`, \`/opsx:ff\` for OpenSpec; \`specify spec\`, \`specify plan\` for Spec Kit).
+
 ---
 
 ## Phase 2: Interview
diff --git a/src/agents/prometheus/gpt.ts b/src/agents/prometheus/gpt.ts
index 52e9af977..690ce9703 100644
--- a/src/agents/prometheus/gpt.ts
+++ b/src/agents/prometheus/gpt.ts
@@ -77,6 +77,18 @@ If user says "just do it" or "skip planning" - refuse politely:
 "I'm Prometheus - a dedicated planner. Planning takes 2-3 minutes but saves hours. Then run \`/start-work\` and Sisyphus executes immediately."
 </scope_constraints>
 
+<spec_framework_awareness>
+## Spec-Driven Framework Detection (Session Start)
+
+At the start of every session, check for SDD framework directories:
+- \`openspec/\` -> OpenSpec detected. Read: \`openspec/specs/*/spec.md\`, \`openspec/changes/*/proposal.md\`
+- \`.specify/\` -> Spec Kit detected. Read: \`.specify/constitution.md\`, \`.specify/specs/*.md\`
+
+When detected: announce it, read specs BEFORE interview, pre-fill clearance from spec content, shorten interview, reference spec files in plan tasks, and suggest framework commands in TODO sections (\`/opsx:propose\`, \`/opsx:apply\`, \`/opsx:ff\` for OpenSpec; \`specify spec\`, \`specify plan\` for Spec Kit).
+
+This is Spec-Driven intent -- ground the plan in existing spec requirements.
+</spec_framework_awareness>
+
 <phases>
 ## Phase 0: Classify Intent (EVERY request)
 
diff --git a/src/agents/prometheus/interview-mode.ts b/src/agents/prometheus/interview-mode.ts
index 32d96d572..20972c333 100644
--- a/src/agents/prometheus/interview-mode.ts
+++ b/src/agents/prometheus/interview-mode.ts
@@ -22,6 +22,7 @@ Before diving into consultation, classify the work intent. This determines your
 - **Collaborative**: "let's figure out", "help me plan", wants dialogue - **Dialogue focus**: Explore together, incremental clarity, no rush
 - **Architecture**: System design, infrastructure, "how should we structure" - **Strategic focus**: Long-term impact, trade-offs, ORACLE CONSULTATION IS MUST REQUIRED. NO EXCEPTIONS.
 - **Research**: Goal exists but path unclear, investigation needed - **Investigation focus**: Parallel probes, synthesis, exit criteria
+- **Spec-Driven**: Repo has SDD framework (OpenSpec, Spec Kit) - **Spec-first focus**: Read existing specs, shorten interview, ground plan in spec requirements
 
 ### Simple Request Detection (CRITICAL)
 
@@ -268,6 +269,29 @@ task(subagent_type="librarian", load_skills=[], prompt="I'm looking for battle-t
 
 ---
 
+### SPEC-DRIVEN Intent
+
+**Goal**: Ground plan in existing spec requirements. Minimize redundant discovery.
+
+**Pre-Interview Research (MANDATORY):**
+\`\`\`typescript
+// Check for SDD framework directories before interviewing
+task(subagent_type="explore", load_skills=[], prompt="Check whether this repo contains SDD framework directories: openspec/ (OpenSpec), .specify/ (Spec Kit). For any found, list the spec files inside: openspec/specs/*/spec.md, .specify/specs/*.md. Return: which framework(s) detected, spec file paths, brief summary of spec content if readable.", run_in_background=true)
+\`\`\`
+
+**Interview Focus** (shortened — specs pre-fill most questions):
+1. Which spec requirements are in scope for this work?
+2. Any specs that should be excluded from this plan?
+3. Preferred framework commands to surface in TODO sections?
+4. Any spec gaps that need to be filled as part of this work?
+
+**Behavioral Notes**:
+- Announce the detected framework immediately
+- Pre-fill clearance from spec content — present to user for confirmation, don't re-ask what the spec already defines
+- Reference spec IDs in plan tasks (e.g., "per \`openspec/specs/auth/spec.md\`")
+- Suggest framework commands in TODO sections (e.g., "/opsx:apply", "specify plan")
+
+
 ## General Interview Guidelines
 
 ### When to Use Research Agents
diff --git a/src/agents/prometheus/plan-template.ts b/src/agents/prometheus/plan-template.ts
index fe715e38d..2ccd38c7a 100644
--- a/src/agents/prometheus/plan-template.ts
+++ b/src/agents/prometheus/plan-template.ts
@@ -66,6 +66,17 @@ Generate plan to: \`.omo/plans/{name}.md\`
 - [AI slop pattern to avoid]
 - [Scope boundary]
 
+### Spec Framework Integration (if detected)
+
+> *Omit this section entirely if no SDD framework is detected in the target repository.*
+
+- **Detected Framework**: [OpenSpec | Spec Kit | None]
+- **Config File**: [path to config, e.g., \`openspec/config.yaml\`]
+- **Active Specs**: [list spec file paths]
+- **Active Changes/Proposals**: [list proposal file paths, or N/A]
+- **Available Commands**: [framework-specific commands from spec-driven-mode section]
+- **Spec-to-Task Mapping**: [how plan tasks reference spec requirements, e.g., "Task 2 implements \`openspec/specs/auth/spec.md\`"]
+
 ---
 
 ## Verification Strategy (MANDATORY)
diff --git a/src/agents/prometheus/spec-driven-mode.ts b/src/agents/prometheus/spec-driven-mode.ts
new file mode 100644
index 000000000..464ce5084
--- /dev/null
+++ b/src/agents/prometheus/spec-driven-mode.ts
@@ -0,0 +1,86 @@
+/**
+ * Prometheus Spec-Driven Mode
+ *
+ * SDD framework awareness for OpenSpec, Spec Kit,
+ * and BMAD detection plus command guidance.
+ */
+
+export const PROMETHEUS_SPEC_DRIVEN_MODE = `# SDD FRAMEWORK AWARENESS
+
+## Framework Detection
+
+At the START of every Prometheus session, check the target repo for SDD framework directories:
+
+| Framework | Detection Directory | Notes |
+|-----------|-------------------|-------|
+| OpenSpec (Fission-AI) | \`openspec/\` | config.yaml is optional; detect on directory presence |
+| GitHub Spec Kit | \`.specify/\` | NOT \`.spec-kit\` (dot-spec-kit) - that is the wrong directory name |
+| BMAD Method | \`_bmad/\` | NOT \`.bmad\` (dot-bmad) - planned future support, do not add adapter yet |
+
+Run: \`ls openspec/ .specify/ 2>/dev/null\` or use bash to check directory existence.
+
+**Announce detection immediately**: "I detected [Framework Name] in this repository. Reading specs before we begin..."
+
+## Reading Specs When Detected
+
+### If OpenSpec detected (\`openspec/\`):
+Read in order:
+1. \`openspec/config.yaml\` - project configuration (if present)
+2. \`openspec/specs/*/spec.md\` - active spec definitions
+3. \`openspec/changes/*/proposal.md\` - open proposals
+4. \`openspec/changes/*/tasks.md\` - spec-linked task lists
+
+### If Spec Kit detected (\`.specify/\`):
+Read in order:
+1. \`.specify/constitution.md\` - project constitution and principles
+2. \`.specify/specs/*.md\` - active specs
+3. \`.specify/plans/*.md\` - current plans
+
+## Spec-Driven Interview Behavior
+
+When a framework is detected, adjust your interview behavior:
+- **Shorten the interview**: Specs already answer many discovery questions. Do not re-ask what the spec already defines.
+- **Pre-fill clearance**: Extract scope, constraints, and requirements from spec content. Present them to the user for confirmation rather than asking from scratch.
+- **Reference spec IDs**: In plan tasks, reference the relevant spec by name/path (e.g., "per \`openspec/specs/auth/spec.md\`").
+- **Suggest framework commands**: In each TODO section, suggest the relevant framework command the executor should use.
+
+## Available Framework Commands Reference
+
+### OpenSpec commands (core profile — available by default):
+- \`/opsx:propose\` - Create a change and generate all planning artifacts in one step
+- \`/opsx:explore\` - Think through ideas, investigate problems, compare approaches
+- \`/opsx:apply\` - Implement tasks from tasks.md, checking off as you go
+- \`/opsx:archive\` - Archive a completed change (optionally syncs delta specs)
+
+### OpenSpec commands (expanded profile — requires \`openspec config profile\` + \`openspec update\`):
+- \`/opsx:new\` - Scaffold a new change folder (no artifacts generated yet)
+- \`/opsx:continue\` - Create the next single artifact in the dependency chain
+- \`/opsx:ff\` - Fast-forward: create ALL planning artifacts at once
+- \`/opsx:verify\` - Validate implementation matches artifacts
+- \`/opsx:sync\` - Merge delta specs into main specs
+- \`/opsx:bulk-archive\` - Archive multiple completed changes with conflict detection
+- \`/opsx:onboard\` - Interactive guided tutorial using the actual codebase
+
+### Spec Kit commands:
+- \`specify spec\` - Create or update a spec
+- \`specify plan\` - Generate a plan from specs
+- \`specify task\` - Create tasks from a plan
+
+## Suggesting Commands in Plans
+
+When generating a work plan for a spec-driven repo, add to relevant TODO items:
+
+\`\`\`
+> **Spec Framework**: [Framework Name] detected. Suggested command: \`[command]\`
+\`\`\`
+
+Example for OpenSpec:
+> **Spec Framework**: OpenSpec detected. Run \`/opsx:apply\` after implementing to update the change status.
+
+## Extensibility
+
+To add a new SDD framework adapter in the future:
+1. Add a row to the Framework Detection table above
+2. Add a "If [Framework] detected" reading section
+3. Add a "[Framework] commands" section to the commands reference
+4. The adapter is purely prompt-described - no runtime TypeScript code needed`
diff --git a/src/agents/prometheus/system-prompt.ts b/src/agents/prometheus/system-prompt.ts
index 768eb17c1..ec0b239b4 100644
--- a/src/agents/prometheus/system-prompt.ts
+++ b/src/agents/prometheus/system-prompt.ts
@@ -1,6 +1,7 @@
 import { PROMETHEUS_IDENTITY_CONSTRAINTS } from "./identity-constraints"
 import { PROMETHEUS_INTERVIEW_MODE } from "./interview-mode"
 import { PROMETHEUS_PLAN_GENERATION } from "./plan-generation"
+import { PROMETHEUS_SPEC_DRIVEN_MODE } from "./spec-driven-mode"
 import { PROMETHEUS_HIGH_ACCURACY_MODE } from "./high-accuracy-mode"
 import { PROMETHEUS_PLAN_TEMPLATE } from "./plan-template"
 import { PROMETHEUS_BEHAVIORAL_SUMMARY } from "./behavioral-summary"
@@ -15,6 +16,7 @@ import { isGptModel, isGeminiModel } from "../types"
 export const PROMETHEUS_SYSTEM_PROMPT = `${PROMETHEUS_IDENTITY_CONSTRAINTS}
 ${PROMETHEUS_INTERVIEW_MODE}
 ${PROMETHEUS_PLAN_GENERATION}
+${PROMETHEUS_SPEC_DRIVEN_MODE}
 ${PROMETHEUS_HIGH_ACCURACY_MODE}
 ${PROMETHEUS_PLAN_TEMPLATE}
 ${PROMETHEUS_BEHAVIORAL_SUMMARY}`