diff --git a/scripts/fish/check-prerequisites.fish b/scripts/fish/check-prerequisites.fish
new file mode 100644
index 0000000000..b93ea72c23
--- /dev/null
+++ b/scripts/fish/check-prerequisites.fish
@@ -0,0 +1,158 @@
+#!/usr/bin/env fish
+
+# Consolidated prerequisite checking script
+#
+# This script provides unified prerequisite checking for Spec-Driven Development workflow.
+# It replaces the functionality previously spread across multiple scripts.
+#
+# Usage: ./check-prerequisites.fish [OPTIONS]
+#
+# OPTIONS:
+#   --json              Output in JSON format
+#   --require-tasks     Require tasks.md to exist (for implementation phase)
+#   --include-tasks     Include tasks.md in AVAILABLE_DOCS list
+#   --paths-only        Only output path variables (no validation)
+#   --help, -h          Show help message
+#
+# OUTPUTS:
+#   JSON mode: {"FEATURE_DIR":"...", "AVAILABLE_DOCS":["..."]}
+#   Text mode: FEATURE_DIR:... \n AVAILABLE_DOCS: \n ✓/✗ file.md
+#   Paths only: REPO_ROOT: ... \n BRANCH: ... \n FEATURE_DIR: ... etc.
+
+# Parse command line arguments
+set JSON_MODE false
+set REQUIRE_TASKS false
+set INCLUDE_TASKS false
+set PATHS_ONLY false
+
+for arg in $argv
+    switch $arg
+        case --json
+            set JSON_MODE true
+        case --require-tasks
+            set REQUIRE_TASKS true
+        case --include-tasks
+            set INCLUDE_TASKS true
+        case --paths-only
+            set PATHS_ONLY true
+        case --help -h
+            echo "Usage: check-prerequisites.fish [OPTIONS]"
+            echo ""
+            echo "Consolidated prerequisite checking for Spec-Driven Development workflow."
+            echo ""
+            echo "OPTIONS:"
+            echo "  --json              Output in JSON format"
+            echo "  --require-tasks     Require tasks.md to exist (for implementation phase)"
+            echo "  --include-tasks     Include tasks.md in AVAILABLE_DOCS list"
+            echo "  --paths-only        Only output path variables (no prerequisite validation)"
+            echo "  --help, -h          Show this help message"
+            echo ""
+            echo "EXAMPLES:"
+            echo "  # Check task prerequisites (plan.md required)"
+            echo "  ./check-prerequisites.fish --json"
+            echo "  "
+            echo "  # Check implementation prerequisites (plan.md + tasks.md required)"
+            echo "  ./check-prerequisites.fish --json --require-tasks --include-tasks"
+            echo "  "
+            echo "  # Get feature paths only (no validation)"
+            echo "  ./check-prerequisites.fish --paths-only"
+            exit 0
+        case '*'
+            echo "ERROR: Unknown option '$arg'. Use --help for usage information." >&2
+            exit 1
+    end
+end
+
+# Source common functions
+set SCRIPT_DIR (dirname (status --current-filename))
+source "$SCRIPT_DIR/common.fish"
+
+# Get feature paths and validate branch
+eval (get_feature_paths)
+check_feature_branch $CURRENT_BRANCH $HAS_GIT; or exit 1
+
+# If paths-only mode, output paths and exit
+if test $PATHS_ONLY = true
+    if test $JSON_MODE = true
+        # Minimal JSON paths payload (no validation performed)
+        printf '{"REPO_ROOT":"%s","BRANCH":"%s","FEATURE_DIR":"%s","FEATURE_SPEC":"%s","IMPL_PLAN":"%s","TASKS":"%s"}\n' \
+            $REPO_ROOT $CURRENT_BRANCH $FEATURE_DIR $FEATURE_SPEC $IMPL_PLAN $TASKS
+    else
+        echo "REPO_ROOT: $REPO_ROOT"
+        echo "BRANCH: $CURRENT_BRANCH"
+        echo "FEATURE_DIR: $FEATURE_DIR"
+        echo "FEATURE_SPEC: $FEATURE_SPEC"
+        echo "IMPL_PLAN: $IMPL_PLAN"
+        echo "TASKS: $TASKS"
+    end
+    exit 0
+end
+
+# Validate required directories and files
+if not test -d "$FEATURE_DIR"
+    echo "ERROR: Feature directory not found: $FEATURE_DIR" >&2
+    echo "Run /speckit.specify first to create the feature structure." >&2
+    exit 1
+end
+
+if not test -f "$IMPL_PLAN"
+    echo "ERROR: plan.md not found in $FEATURE_DIR" >&2
+    echo "Run /speckit.plan first to create the implementation plan." >&2
+    exit 1
+end
+
+# Check for tasks.md if required
+if test $REQUIRE_TASKS = true; and not test -f "$TASKS"
+    echo "ERROR: tasks.md not found in $FEATURE_DIR" >&2
+    echo "Run /speckit.tasks first to create the task list." >&2
+    exit 1
+end
+
+# Build list of available documents
+set docs
+
+# Always check these optional docs
+test -f "$RESEARCH"; and set -a docs "research.md"
+test -f "$DATA_MODEL"; and set -a docs "data-model.md"
+
+# Check contracts directory (only if it exists and has files)
+if test -d "$CONTRACTS_DIR"; and test -n (ls -A "$CONTRACTS_DIR" 2>/dev/null)
+    set -a docs "contracts/"
+end
+
+test -f "$QUICKSTART"; and set -a docs "quickstart.md"
+
+# Include tasks.md if requested and it exists
+if test $INCLUDE_TASKS = true; and test -f "$TASKS"
+    set -a docs "tasks.md"
+end
+
+# Output results
+if test $JSON_MODE = true
+    # Build JSON array of documents
+    if test (count $docs) -eq 0
+        set json_docs "[]"
+    else
+        set json_parts
+        for doc in $docs
+            set -a json_parts "\"$doc\""
+        end
+        set json_docs "["(string join "," $json_parts)"]"
+    end
+    
+    printf '{"FEATURE_DIR":"%s","AVAILABLE_DOCS":%s}\n' $FEATURE_DIR $json_docs
+else
+    # Text output
+    echo "FEATURE_DIR:$FEATURE_DIR"
+    echo "AVAILABLE_DOCS:"
+    
+    # Show status of each potential document
+    check_file $RESEARCH "research.md"
+    check_file $DATA_MODEL "data-model.md"
+    check_dir $CONTRACTS_DIR "contracts/"
+    check_file $QUICKSTART "quickstart.md"
+    
+    if test $INCLUDE_TASKS = true
+        check_file $TASKS "tasks.md"
+    end
+end