diff --git a/apps/coordinator/src/models.py b/apps/coordinator/src/models.py
index eb04b97..d1186f9 100644
--- a/apps/coordinator/src/models.py
+++ b/apps/coordinator/src/models.py
@@ -6,6 +6,24 @@ from typing import Literal
 from pydantic import BaseModel, Field, field_validator
 
 
+class Capability(str, Enum):
+    """Agent capability levels."""
+
+    HIGH = "high"
+    MEDIUM = "medium"
+    LOW = "low"
+
+
+class AgentName(str, Enum):
+    """Available AI agents."""
+
+    OPUS = "opus"
+    SONNET = "sonnet"
+    HAIKU = "haiku"
+    GLM = "glm"
+    MINIMAX = "minimax"
+
+
 class ContextAction(str, Enum):
     """Actions to take based on context usage thresholds."""
 
@@ -108,3 +126,88 @@ class IssueMetadata(BaseModel):
         if v is None:
             return []
         return v
+
+
+class AgentProfile(BaseModel):
+    """Profile defining agent capabilities, costs, and context limits."""
+
+    name: AgentName = Field(description="Agent identifier")
+    context_limit: int = Field(
+        gt=0,
+        description="Maximum tokens for agent context window"
+    )
+    cost_per_mtok: float = Field(
+        ge=0.0,
+        description="Cost per million tokens (0 for self-hosted)"
+    )
+    capabilities: list[Capability] = Field(
+        min_length=1,
+        description="Difficulty levels this agent can handle"
+    )
+    best_for: str = Field(
+        min_length=1,
+        description="Optimal use cases for this agent"
+    )
+
+    @field_validator("best_for", mode="before")
+    @classmethod
+    def validate_best_for_not_empty(cls, v: str) -> str:
+        """Ensure best_for description is not empty."""
+        if not v or not v.strip():
+            raise ValueError("best_for description cannot be empty")
+        return v
+
+
+# Predefined agent profiles
+AGENT_PROFILES: dict[AgentName, AgentProfile] = {
+    AgentName.OPUS: AgentProfile(
+        name=AgentName.OPUS,
+        context_limit=200000,
+        cost_per_mtok=15.0,
+        capabilities=[Capability.HIGH, Capability.MEDIUM, Capability.LOW],
+        best_for="Complex reasoning, code generation, and multi-step problem solving"
+    ),
+    AgentName.SONNET: AgentProfile(
+        name=AgentName.SONNET,
+        context_limit=200000,
+        cost_per_mtok=3.0,
+        capabilities=[Capability.MEDIUM, Capability.LOW],
+        best_for="Balanced performance for general tasks and scripting"
+    ),
+    AgentName.HAIKU: AgentProfile(
+        name=AgentName.HAIKU,
+        context_limit=200000,
+        cost_per_mtok=0.8,
+        capabilities=[Capability.LOW],
+        best_for="Fast, cost-effective processing of simple tasks"
+    ),
+    AgentName.GLM: AgentProfile(
+        name=AgentName.GLM,
+        context_limit=128000,
+        cost_per_mtok=0.0,
+        capabilities=[Capability.MEDIUM, Capability.LOW],
+        best_for="Self-hosted open-source model for medium complexity tasks"
+    ),
+    AgentName.MINIMAX: AgentProfile(
+        name=AgentName.MINIMAX,
+        context_limit=128000,
+        cost_per_mtok=0.0,
+        capabilities=[Capability.LOW],
+        best_for="Self-hosted lightweight model for simple tasks and prototyping"
+    ),
+}
+
+
+def get_agent_profile(agent_name: AgentName) -> AgentProfile:
+    """Retrieve profile for a specific agent.
+
+    Args:
+        agent_name: Name of the agent
+
+    Returns:
+        AgentProfile for the requested agent
+
+    Raises:
+        KeyError: If agent_name is not defined
+    """
+    return AGENT_PROFILES[agent_name]
diff --git a/apps/coordinator/tests/test_agent_profiles.py b/apps/coordinator/tests/test_agent_profiles.py
new file mode 100644
index 0000000..208c0c4
--- /dev/null
+++ b/apps/coordinator/tests/test_agent_profiles.py
@@ -0,0 +1,402 @@
+"""Tests for agent profile system."""
+
+import pytest
+
+from src.models import (
+    AGENT_PROFILES,
+    AgentName,
+    AgentProfile,
+    Capability,
+    get_agent_profile,
+)
+
+
+class TestAgentProfileDataStructure:
+    """Tests for AgentProfile data structure."""
+
+    def test_agent_profile_has_required_fields(self) -> None:
+        """Test that AgentProfile has all required fields."""
+        profile = AgentProfile(
+            name=AgentName.OPUS,
+            context_limit=200000,
+            cost_per_mtok=15.0,
+            capabilities=[Capability.HIGH, Capability.MEDIUM, Capability.LOW],
+            best_for="Complex reasoning and code generation"
+        )
+
+        assert profile.name == AgentName.OPUS
+        assert profile.context_limit == 200000
+        assert profile.cost_per_mtok == 15.0
+        assert len(profile.capabilities) == 3
+        assert profile.best_for == "Complex reasoning and code generation"
+
+    def test_agent_profile_validation_positive_context_limit(self) -> None:
+        """Test that context_limit must be positive."""
+        with pytest.raises(ValueError):
+            AgentProfile(
+                name=AgentName.OPUS,
+                context_limit=-1,
+                cost_per_mtok=15.0,
+                capabilities=[Capability.HIGH],
+                best_for="Test"
+            )
+
+    def test_agent_profile_validation_zero_context_limit(self) -> None:
+        """Test that context_limit cannot be zero."""
+        with pytest.raises(ValueError):
+            AgentProfile(
+                name=AgentName.OPUS,
+                context_limit=0,
+                cost_per_mtok=15.0,
+                capabilities=[Capability.HIGH],
+                best_for="Test"
+            )
+
+    def test_agent_profile_validation_non_negative_cost(self) -> None:
+        """Test that cost_per_mtok must be non-negative."""
+        with pytest.raises(ValueError):
+            AgentProfile(
+                name=AgentName.OPUS,
+                context_limit=200000,
+                cost_per_mtok=-1.0,
+                capabilities=[Capability.HIGH],
+                best_for="Test"
+            )
+
+    def test_agent_profile_validation_non_empty_capabilities(self) -> None:
+        """Test that capabilities list cannot be empty."""
+        with pytest.raises(ValueError):
+            AgentProfile(
+                name=AgentName.OPUS,
+                context_limit=200000,
+                cost_per_mtok=15.0,
+                capabilities=[],
+                best_for="Test"
+            )
+
+    def test_agent_profile_validation_non_empty_best_for(self) -> None:
+        """Test that best_for description cannot be empty."""
+        with pytest.raises(ValueError):
+            AgentProfile(
+                name=AgentName.OPUS,
+                context_limit=200000,
+                cost_per_mtok=15.0,
+                capabilities=[Capability.HIGH],
+                best_for=""
+            )
+
+
+class TestAgentProfilesDefinition:
+    """Tests for predefined agent profiles."""
+
+    def test_opus_profile_exists(self) -> None:
+        """Test that Opus profile is defined correctly."""
+        assert AgentName.OPUS in AGENT_PROFILES
+        profile = AGENT_PROFILES[AgentName.OPUS]
+
+        assert profile.name == AgentName.OPUS
+        assert profile.context_limit == 200000
+        assert profile.cost_per_mtok == 15.0
+        assert Capability.HIGH in profile.capabilities
+        assert Capability.MEDIUM in profile.capabilities
+        assert Capability.LOW in profile.capabilities
+        assert "complex" in profile.best_for.lower() or "reasoning" in profile.best_for.lower()
+
+    def test_sonnet_profile_exists(self) -> None:
+        """Test that Sonnet profile is defined correctly."""
+        assert AgentName.SONNET in AGENT_PROFILES
+        profile = AGENT_PROFILES[AgentName.SONNET]
+
+        assert profile.name == AgentName.SONNET
+        assert profile.context_limit == 200000
+        assert profile.cost_per_mtok == 3.0
+        assert Capability.MEDIUM in profile.capabilities
+        assert Capability.LOW in profile.capabilities
+        assert Capability.HIGH not in profile.capabilities
+
+    def test_haiku_profile_exists(self) -> None:
+        """Test that Haiku profile is defined correctly."""
+        assert AgentName.HAIKU in AGENT_PROFILES
+        profile = AGENT_PROFILES[AgentName.HAIKU]
+
+        assert profile.name == AgentName.HAIKU
+        assert profile.context_limit == 200000
+        assert profile.cost_per_mtok == 0.8
+        assert Capability.LOW in profile.capabilities
+        assert Capability.MEDIUM not in profile.capabilities
+        assert Capability.HIGH not in profile.capabilities
+
+    def test_glm_profile_exists(self) -> None:
+        """Test that GLM profile is defined correctly."""
+        assert AgentName.GLM in AGENT_PROFILES
+        profile = AGENT_PROFILES[AgentName.GLM]
+
+        assert profile.name == AgentName.GLM
+        assert profile.context_limit == 128000
+        assert profile.cost_per_mtok == 0.0
+        assert Capability.MEDIUM in profile.capabilities
+        assert Capability.LOW in profile.capabilities
+
+    def test_minimax_profile_exists(self) -> None:
+        """Test that MiniMax profile is defined correctly."""
+        assert AgentName.MINIMAX in AGENT_PROFILES
+        profile = AGENT_PROFILES[AgentName.MINIMAX]
+
+        assert profile.name == AgentName.MINIMAX
+        assert profile.context_limit == 128000
+        assert profile.cost_per_mtok == 0.0
+        assert Capability.LOW in profile.capabilities
+
+    def test_all_profiles_have_unique_costs_and_limits(self) -> None:
+        """Test that costs and context limits are correctly differentiated."""
+        # Verify at least some differentiation exists
+        opus = AGENT_PROFILES[AgentName.OPUS]
+        sonnet = AGENT_PROFILES[AgentName.SONNET]
+        haiku = AGENT_PROFILES[AgentName.HAIKU]
+        glm = AGENT_PROFILES[AgentName.GLM]
+        minimax = AGENT_PROFILES[AgentName.MINIMAX]
+
+        # Opus should have highest cost
+        assert opus.cost_per_mtok > sonnet.cost_per_mtok
+        assert sonnet.cost_per_mtok > haiku.cost_per_mtok
+
+        # Self-hosted should be free
+        assert glm.cost_per_mtok == 0.0
+        assert minimax.cost_per_mtok == 0.0
+
+
+class TestGetAgentProfile:
+    """Tests for get_agent_profile function."""
+
+    def test_get_opus_profile(self) -> None:
+        """Test retrieving Opus profile by name."""
+        profile = get_agent_profile(AgentName.OPUS)
+
+        assert profile.name == AgentName.OPUS
+        assert profile.context_limit == 200000
+
+    def test_get_sonnet_profile(self) -> None:
+        """Test retrieving Sonnet profile by name."""
+        profile = get_agent_profile(AgentName.SONNET)
+
+        assert profile.name == AgentName.SONNET
+        assert profile.context_limit == 200000
+
+    def test_get_haiku_profile(self) -> None:
+        """Test retrieving Haiku profile by name."""
+        profile = get_agent_profile(AgentName.HAIKU)
+
+        assert profile.name == AgentName.HAIKU
+        assert profile.context_limit == 200000
+
+    def test_get_glm_profile(self) -> None:
+        """Test retrieving GLM profile by name."""
+        profile = get_agent_profile(AgentName.GLM)
+
+        assert profile.name == AgentName.GLM
+        assert profile.context_limit == 128000
+
+    def test_get_minimax_profile(self) -> None:
+        """Test retrieving MiniMax profile by name."""
+        profile = get_agent_profile(AgentName.MINIMAX)
+
+        assert profile.name == AgentName.MINIMAX
+        assert profile.context_limit == 128000
+
+    def test_get_profile_returns_copy(self) -> None:
+        """Test that get_agent_profile returns independent copies."""
+        profile1 = get_agent_profile(AgentName.OPUS)
+        profile2 = get_agent_profile(AgentName.OPUS)
+
+        # Verify same values
+        assert profile1.name == profile2.name
+        assert profile1.context_limit == profile2.context_limit
+
+        # Verify they are equal but can be independently modified if needed
+        assert profile1.model_dump() == profile2.model_dump()
+
+
+class TestCapabilityEnum:
+    """Tests for Capability enum."""
+
+    def test_capability_enum_values(self) -> None:
+        """Test that Capability enum has expected values."""
+        assert Capability.HIGH.value == "high"
+        assert Capability.MEDIUM.value == "medium"
+        assert Capability.LOW.value == "low"
+
+    def test_capability_enum_ordering(self) -> None:
+        """Test capability comparison logic."""
+        # All three should be available
+        capabilities = [Capability.HIGH, Capability.MEDIUM, Capability.LOW]
+        assert len(capabilities) == 3
+
+
+class TestAgentNameEnum:
+    """Tests for AgentName enum."""
+
+    def test_agent_name_enum_values(self) -> None:
+        """Test that AgentName enum has all expected agents."""
+        agent_names = [
+            AgentName.OPUS,
+            AgentName.SONNET,
+            AgentName.HAIKU,
+            AgentName.GLM,
+            AgentName.MINIMAX,
+        ]
+        assert len(agent_names) == 5
+
+    def test_agent_name_string_representation(self) -> None:
+        """Test string values of agent names."""
+        assert AgentName.OPUS.value == "opus"
+        assert AgentName.SONNET.value == "sonnet"
+        assert AgentName.HAIKU.value == "haiku"
+        assert AgentName.GLM.value == "glm"
+        assert AgentName.MINIMAX.value == "minimax"
+
+
+class TestProfileCapabilityMatching:
+    """Tests for capability matching against profiles."""
+
+    def test_opus_handles_high_difficulty(self) -> None:
+        """Test that Opus can handle high difficulty tasks."""
+        profile = get_agent_profile(AgentName.OPUS)
+        assert Capability.HIGH in profile.capabilities
+
+    def test_sonnet_handles_medium_difficulty(self) -> None:
+        """Test that Sonnet can handle medium difficulty tasks."""
+        profile = get_agent_profile(AgentName.SONNET)
+        assert Capability.MEDIUM in profile.capabilities
+
+    def test_haiku_handles_low_difficulty(self) -> None:
+        """Test that Haiku can handle low difficulty tasks."""
+        profile = get_agent_profile(AgentName.HAIKU)
+        assert Capability.LOW in profile.capabilities
+
+    def test_profile_best_for_description_exists(self) -> None:
+        """Test that all profiles have meaningful best_for descriptions."""
+        for agent_name, profile in AGENT_PROFILES.items():
+            msg_short = f"{agent_name} has insufficient best_for description"
+            assert len(profile.best_for) > 10, msg_short
+            msg_incomplete = f"{agent_name} has incomplete best_for description"
+            assert not profile.best_for.endswith("..."), msg_incomplete
+
+
+class TestProfileConsistency:
+    """Tests for consistency across all profiles."""
+
+    def test_all_profiles_defined(self) -> None:
+        """Test that all five agents have profiles defined."""
+        assert len(AGENT_PROFILES) == 5
+        agent_names = {
+            AgentName.OPUS,
+            AgentName.SONNET,
+            AgentName.HAIKU,
+            AgentName.GLM,
+            AgentName.MINIMAX,
+        }
+        defined_names = set(AGENT_PROFILES.keys())
+        assert agent_names == defined_names
+
+    def test_anthropic_models_have_200k_context(self) -> None:
+        """Test that Anthropic models have 200K context limit."""
+        anthropic_models = [AgentName.OPUS, AgentName.SONNET, AgentName.HAIKU]
+        for model in anthropic_models:
+            profile = AGENT_PROFILES[model]
+            assert profile.context_limit == 200000
+
+    def test_self_hosted_models_have_128k_context(self) -> None:
+        """Test that self-hosted models have 128K context limit."""
+        self_hosted_models = [AgentName.GLM, AgentName.MINIMAX]
+        for model in self_hosted_models:
+            profile = AGENT_PROFILES[model]
+            assert profile.context_limit == 128000
+
+    def test_self_hosted_models_are_free(self) -> None:
+        """Test that self-hosted models have zero cost."""
+        self_hosted_models = [AgentName.GLM, AgentName.MINIMAX]
+        for model in self_hosted_models:
+            profile = AGENT_PROFILES[model]
+            assert profile.cost_per_mtok == 0.0
+
+    def test_anthropic_models_have_costs(self) -> None:
+        """Test that Anthropic models have non-zero costs."""
+        anthropic_models = [AgentName.OPUS, AgentName.SONNET, AgentName.HAIKU]
+        for model in anthropic_models:
+            profile = AGENT_PROFILES[model]
+            assert profile.cost_per_mtok > 0.0
+
+    def test_cost_reflects_capability(self) -> None:
+        """Test that cost roughly reflects capability level."""
+        opus_cost = AGENT_PROFILES[AgentName.OPUS].cost_per_mtok
+        sonnet_cost = AGENT_PROFILES[AgentName.SONNET].cost_per_mtok
+        haiku_cost = AGENT_PROFILES[AgentName.HAIKU].cost_per_mtok
+
+        # Opus > Sonnet > Haiku
+        assert opus_cost > sonnet_cost
+        assert sonnet_cost > haiku_cost
+
+
+class TestBestForValidation:
+    """Tests for best_for field validation."""
+
+    def test_best_for_with_whitespace_only_fails(self) -> None:
+        """Test that best_for with only whitespace is rejected."""
+        with pytest.raises(ValueError):
+            AgentProfile(
+                name=AgentName.OPUS,
+                context_limit=200000,
+                cost_per_mtok=15.0,
+                capabilities=[Capability.HIGH],
+                best_for="   "
+            )
+
+    def test_best_for_with_valid_string_passes(self) -> None:
+        """Test that best_for with valid text passes validation."""
+        profile = AgentProfile(
+            name=AgentName.OPUS,
+            context_limit=200000,
+            cost_per_mtok=15.0,
+            capabilities=[Capability.HIGH],
+            best_for="Valid description"
+        )
+        assert profile.best_for == "Valid description"
+
+
+class TestCapabilityValidation:
+    """Tests for capability-specific validation."""
+
+    def test_multiple_capabilities_allowed(self) -> None:
+        """Test that multiple capabilities can be assigned."""
+        profile = AgentProfile(
+            name=AgentName.OPUS,
+            context_limit=200000,
+            cost_per_mtok=15.0,
+            capabilities=[Capability.HIGH, Capability.MEDIUM, Capability.LOW],
+            best_for="Test"
+        )
+        assert len(profile.capabilities) == 3
+
+    def test_single_capability_allowed(self) -> None:
+        """Test that single capability can be assigned."""
+        profile = AgentProfile(
+            name=AgentName.HAIKU,
+            context_limit=200000,
+            cost_per_mtok=0.8,
+            capabilities=[Capability.LOW],
+            best_for="Test"
+        )
+        assert len(profile.capabilities) == 1
+        assert profile.capabilities[0] == Capability.LOW
+
+    def test_duplicate_capabilities_handled(self) -> None:
+        """Test that duplicate capabilities are allowed (pydantic behavior)."""
+        profile = AgentProfile(
+            name=AgentName.OPUS,
+            context_limit=200000,
+            cost_per_mtok=15.0,
+            capabilities=[Capability.HIGH, Capability.HIGH, Capability.MEDIUM],
+            best_for="Test"
+        )
+        assert Capability.HIGH in profile.capabilities
+        assert Capability.MEDIUM in profile.capabilities